ADC Dataset: I/259 -- The Tycho-2 Catalogue of the 2.5 Million Brightest Stars (2000)

E. Hog, C. Fabricius, V. V. Makarov, S. Urban, T. Corbin, G. Wycoff, U. Bastian, P. Schwekendiek, A. Wicenec

Keywords: Positional data ; Proper motions ; Surveys ; Photometry ; Stars, double and multiple ; astrometry ; stars: fundamental parameters ; catalogs

Source Reference(s):
Astron. Astrophys., Vol. 355, p.27, 2000 (ADS: 2000A&A...355L..27H)

Abstract:

The Tycho-2 Catalogue is an astrometric reference catalogue containing positions and proper motions as well as two-colour photometric data for the 2.5 million brightest stars in the sky. The Tycho-2 positions and magnitudes are based on precisely the same observations as the original Tycho Catalogue (hereafter Tycho-1; see Cat. <I/239>)) collected by the star mapper of the ESA Hipparcos satellite, but Tycho-2 is much bigger and slightly more precise, owing to a more advanced reduction technique. Components of double stars with separations down to 0.8 arcsec are included. Proper motions precise to about 2.5 mas/yr are given as derived from a comparison with the Astrographic Catalogue and 143 other ground-based astrometric catalogues, all reduced to the Hipparcos celestial coordinate system. Tycho-2 supersedes in most applications Tycho-1, as well as the ACT (Cat. <I/246>) and TRC (Cat. <I/250>) catalogues based on Tycho-1. Supplement-1 lists stars from the Hipparcos and Tycho-1 Catalogues which are not in Tycho-2. Supplement-2 lists 1146 Tycho-1 stars which are probably either false or heavily disturbed.

For more information, please consult the Tycho-2 home page: http://www.astro.ku.dk/~erik/Tycho-2

Catalogue Characteristics:

The principal characteristics of the Tycho-2 Catalogue are summarized below. By means of proper motions the positions are transferred to the year 2000.0, the epoch of the catalogue. The median values of internal standard errors are given. ------------------------------------------------------------ Mean satellite observation epoch ~J1991.5 Epoch of the Tycho-2 Catalogue J2000.0 Reference system ICRS coincidence with ICRS (1) +/-0.6 mas deviation from inertial (1) +/-0.25 mas/yr Number of entries 2,539,913 Astrometric standard errors (2) V_T_ < 9 mag 7 mas all stars, positions 60 mas all stars, proper motions 2.5 mas/yr Photometric std. errors (3) on V_T_ V_T_ < 9 mag 0.013 mag all stars 0.10 mag Star density b= 0 deg 150 stars/sq.deg. b= +/-30 deg 50 stars/sq.deg. b= +/-90 deg 25 stars/sq.deg. Completeness to 90 per cent V ~ 11.5 mag Completeness to 99 per cent V ~ 11.0 mag Number of Tycho observations ~300 10^6^ ------------------------------------------------------------ Note (1): about all 3 axes Note (2): ratio of external to internal standard errors is ~1.0 for positions and for proper motions. Systematic errors are less than 1 mas and 0.5 mas/yr Note (3): ratio of photometric external to internal standard errors at V_T_ > 9 mag is below 1.5 ------------------------------------------------------------

Details:

-- Mission(s): Hipparcos

Nomenclature

The TYC identifier is constructed from the GSC region number (TYC1), the running number within the region (TYC2) and a component identifier (TYC3) which is normally 1. Some non-GSC running numbers were constructed for the first Tycho Catalogue and for Tycho-2. The recommended star designation contains a hyphen between the TYC numbers, e.g. TYC 1-13-1.

Field separator in the data files: In the data files, the fields in each record are separated by a vertical bar, |. In this connection the TYC identifier (TYC1, TYC2 and TYC3) constitutes one field and the pair of a HIP number with a CCDM identifier is also considered one field.

Quick Access to This Dataset:

FTP ADC Viewer

See Also:

Dataset: I/239: The Hipparcos and Tycho Catalogues (ESA 1997)
Dataset: I/211: CCDM (Components of Double and Multiple stars) (Dommanget+ 1994)
Dataset: I/246: The ACT Reference Catalog (Urban+ 1997)
Dataset: I/250: The Tycho Reference Catalogue (Hog+ 1998)
Web Link: Tycho-2 home page

Table File Information:

1259_tyc2_00.dat - *The Tycho-2 main catalogue
View this Data Download via FTP

Field	Label	Units	Format	Definition
1	TYC1	---	I4	[1,9537]+= TYC1 from TYC or GSC (1)^(1-1-1)
2	TYC2	---	I5	[1,12121] TYC2 from TYC or GSC (1)^(1-1-1)
3	TYC3	---	I2	[1,3] TYC3 from TYC (1)^(1-1-1)
4	pflag	---	A1	[ PX] mean position flag (2)^(1-1-2)
5	RAmdeg	deg	F12.8	[]? Mean Right Asc, ICRS, epoch=J2000 (3)^(1-1-3)
6	DEmdeg	deg	F12.8	[]? Mean Decl, ICRS, at epoch=J2000 (3)^(1-1-3)
7	pmRA	mas/yr	F7.1	[-4418.0,6544.2]? prop. mot. in RA*cos(dec)
8	pmDE	mas/yr	F7.1	[-5774.3,10277.3]? prop. mot. in Dec
9	e_RAmdeg	mas	I3	[3,183]? s.e. RA*cos(dec),at mean epoch (5)^(1-1-5)
10	e_DEmdeg	mas	I3	[1,184]? s.e. of Dec at mean epoch (5)^(1-1-5)
11	e_pmRA	mas/yr	F4.1	[0.2,11.5]? s.e. prop mot in RA*cos(dec)(5)^(1-1-5)
12	e_pmDE	mas/yr	F4.1	[0.2,10.3]? s.e. of proper motion in Dec(5)^(1-1-5)
13	EpRAm	yr	F7.2	[1915.95,1992.53]? mean epoch of RA (4)^(1-1-4)
14	EpDEm	yr	F7.2	[1911.94,1992.01]? mean epoch of Dec (4)^(1-1-4)
15	Num	---	I2	[2,36]? Number of positions used
16	q_RAmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean RA (6)^(1-1-6)
17	q_DEmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean Dec (6)^(1-1-6)
18	q_pmRA	---	F4.1	[0.0,9.9]? Goodness of fit for pmRA (6)^(1-1-6)
19	q_pmDE	---	F4.1	[0.0,9.9]? Goodness of fit for pmDE (6)^(1-1-6)
20	BTmag	mag	F6.3	[2.183,16.581]? Tycho-2 BT magnitude (7)^(1-1-7)
21	e_BTmag	mag	F6.3	[0.014,1.977]? s.e. of BT (7)^(1-1-7)
22	VTmag	mag	F6.3	[1.905,15.193]? Tycho-2 VT magnitude (7)^(1-1-7)
23	e_VTmag	mag	F6.3	[0.009,1.468]? s.e. of VT (7)^(1-1-7)
24	prox	---	I3	[3,999] proximity indicator (8)^(1-1-8)
25	TYC	---	A1	[T] Tycho-1 star (9)^(1-1-9)
26	HIP	---	I6	[1,120404]? Hipparcos number
27	CCDM	---	A3	CCDM component identifier for HIP stars(10)^(1-1-10)
28	RAdeg	deg	F12.8	Observed Tycho-2 Right Ascension, ICRS
29	DEdeg	deg	F12.8	Observed Tycho-2 Declination, ICRS
30	EpRA-1990	yr	F5.2	[0.81,2.13] epoch-1990 of RAdeg
31	EpDE-1990	yr	F5.2	[0.72,2.36] epoch-1990 of DEdeg
32	e_RAdeg	mas	F5.1	s.e.RA*cos(dec), of observed Tycho-2 RA (5)^(1-1-5)
33	e_DEdeg	mas	F5.1	s.e. of observed Tycho-2 Dec (5)^(1-1-5)
34	posflg	---	A1	[ DP] type of Tycho-2 solution (11)^(1-1-11)
35	corr	---	F4.1	[-1,1] correlation (RAdeg,DEdeg)

	^(1-1-1)The TYC identifier is constructed from the GSC region number (TYC1), the running number within the region (TYC2) and a component identifier (TYC3) which is normally 1. Some non-GSC running numbers were constructed for the first Tycho Catalogue and for Tycho-2. The recommended star designation contains a hyphen between the TYC numbers, e.g. TYC 1-13-1.
	^(1-1-2) ' ' = normal mean position and proper motion. 'P' = the mean position, proper motion, etc., refer to the photocentre of two Tycho-2 entries, where the BT magnitudes were used in weighting the positions. 'X' = no mean position, no proper motion.
	^(1-1-3) The mean position is a weighted mean for the catalogues contributing to the proper motion determination. This mean has then been brought to epoch 2000.0 by the computed proper motion. See Note(2) above for details. Tycho-2 is one of the several catalogues used to determine the mean position and proper motion. The observed Tycho-2 position is given in the fields RAdeg and DEdeg.
	^(1-1-5) The errors are based on error models.
	^(1-1-4) The mean epochs are given in Julian years.
	^(1-1-6) This goodness of fit is the ratio of the scatter-based and the model-based error. It is only defined when Num > 2. Values exceeding 9.9 are truncated to 9.9.
	^(1-1-7) Blank when no magnitude is available. Either BTmag or VTmag is always given. Approximate Johnson photometry may be obtained as: V = VT -0.090(BT-VT) B-V = 0.850(BT-VT) Consult Sect 1.3 of Vol 1 of "The Hipparcos and Tycho Catalogues", ESA SP-1200, 1997, for details.
	^(1-1-8) Distance in units of 100 mas to the nearest entry in the Tycho-2 main catalogue or supplement. The distance is computed for the epoch 1991.25. A value of 999 (i.e. 99.9 arcsec) is given if the distance exceeds 99.9 arcsec.
	^(1-1-9) ' ' = no Tycho-1 star was found within 0.8 arcsec (quality 1-8) or 2.4 arcsec (quality 9). 'T' = this is a Tycho-1 star. The Tycho-1 identifier is given in the beginning of the record. For Tycho-1 stars, resolved in Tycho-2 as a close pair, both components are flagged as a Tycho-1 star and the Tycho-1 TYC3 is assigned to the brightest (VT) component. The HIP-only stars given in Tycho-1 are not flagged as Tycho-1 stars.
	^(1-1-10) The CCDM component identifiers for double or multiple Hipparcos stars contributing to this Tycho-2 entry. For photocentre solutions, all components within 0.8 arcsec contribute. For double star solutions any unresolved component within 0.8 arcsec contributes. For single star solutions, the predicted signal from close stars were normally subtracted in the analysis of the photon counts and such stars therefore do not contribute to the solution. The components are given in lexical order.
	^(1-1-11) ' ' = normal treatment, close stars were subtracted when possible. 'D' = double star treatment. Two stars were found. The companion is normally included as a separate Tycho-2 entry, but may have been rejected. 'P' = photocentre treatment, close stars were not subtracted. This special treatment was applied to known or suspected doubles which were not successfully (or reliably) resolved in the Tycho-2 double star processing.

1259_tyc2_01.dat - *The Tycho-2 main catalogue
View this Data Download via FTP

Field	Label	Units	Format	Definition
1	TYC1	---	I4	[1,9537]+= TYC1 from TYC or GSC (1)^(1-2-1)
2	TYC2	---	I5	[1,12121] TYC2 from TYC or GSC (1)^(1-2-1)
3	TYC3	---	I2	[1,3] TYC3 from TYC (1)^(1-2-1)
4	pflag	---	A1	[ PX] mean position flag (2)^(1-2-2)
5	RAmdeg	deg	F12.8	[]? Mean Right Asc, ICRS, epoch=J2000 (3)^(1-2-3)
6	DEmdeg	deg	F12.8	[]? Mean Decl, ICRS, at epoch=J2000 (3)^(1-2-3)
7	pmRA	mas/yr	F7.1	[-4418.0,6544.2]? prop. mot. in RA*cos(dec)
8	pmDE	mas/yr	F7.1	[-5774.3,10277.3]? prop. mot. in Dec
9	e_RAmdeg	mas	I3	[3,183]? s.e. RA*cos(dec),at mean epoch (5)^(1-2-5)
10	e_DEmdeg	mas	I3	[1,184]? s.e. of Dec at mean epoch (5)^(1-2-5)
11	e_pmRA	mas/yr	F4.1	[0.2,11.5]? s.e. prop mot in RA*cos(dec)(5)^(1-2-5)
12	e_pmDE	mas/yr	F4.1	[0.2,10.3]? s.e. of proper motion in Dec(5)^(1-2-5)
13	EpRAm	yr	F7.2	[1915.95,1992.53]? mean epoch of RA (4)^(1-2-4)
14	EpDEm	yr	F7.2	[1911.94,1992.01]? mean epoch of Dec (4)^(1-2-4)
15	Num	---	I2	[2,36]? Number of positions used
16	q_RAmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean RA (6)^(1-2-6)
17	q_DEmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean Dec (6)^(1-2-6)
18	q_pmRA	---	F4.1	[0.0,9.9]? Goodness of fit for pmRA (6)^(1-2-6)
19	q_pmDE	---	F4.1	[0.0,9.9]? Goodness of fit for pmDE (6)^(1-2-6)
20	BTmag	mag	F6.3	[2.183,16.581]? Tycho-2 BT magnitude (7)^(1-2-7)
21	e_BTmag	mag	F6.3	[0.014,1.977]? s.e. of BT (7)^(1-2-7)
22	VTmag	mag	F6.3	[1.905,15.193]? Tycho-2 VT magnitude (7)^(1-2-7)
23	e_VTmag	mag	F6.3	[0.009,1.468]? s.e. of VT (7)^(1-2-7)
24	prox	---	I3	[3,999] proximity indicator (8)^(1-2-8)
25	TYC	---	A1	[T] Tycho-1 star (9)^(1-2-9)
26	HIP	---	I6	[1,120404]? Hipparcos number
27	CCDM	---	A3	CCDM component identifier for HIP stars(10)^(1-2-10)
28	RAdeg	deg	F12.8	Observed Tycho-2 Right Ascension, ICRS
29	DEdeg	deg	F12.8	Observed Tycho-2 Declination, ICRS
30	EpRA-1990	yr	F5.2	[0.81,2.13] epoch-1990 of RAdeg
31	EpDE-1990	yr	F5.2	[0.72,2.36] epoch-1990 of DEdeg
32	e_RAdeg	mas	F5.1	s.e.RA*cos(dec), of observed Tycho-2 RA (5)^(1-2-5)
33	e_DEdeg	mas	F5.1	s.e. of observed Tycho-2 Dec (5)^(1-2-5)
34	posflg	---	A1	[ DP] type of Tycho-2 solution (11)^(1-2-11)
35	corr	---	F4.1	[-1,1] correlation (RAdeg,DEdeg)

	^(1-2-1)The TYC identifier is constructed from the GSC region number (TYC1), the running number within the region (TYC2) and a component identifier (TYC3) which is normally 1. Some non-GSC running numbers were constructed for the first Tycho Catalogue and for Tycho-2. The recommended star designation contains a hyphen between the TYC numbers, e.g. TYC 1-13-1.
	^(1-2-2) ' ' = normal mean position and proper motion. 'P' = the mean position, proper motion, etc., refer to the photocentre of two Tycho-2 entries, where the BT magnitudes were used in weighting the positions. 'X' = no mean position, no proper motion.
	^(1-2-3) The mean position is a weighted mean for the catalogues contributing to the proper motion determination. This mean has then been brought to epoch 2000.0 by the computed proper motion. See Note(2) above for details. Tycho-2 is one of the several catalogues used to determine the mean position and proper motion. The observed Tycho-2 position is given in the fields RAdeg and DEdeg.
	^(1-2-5) The errors are based on error models.
	^(1-2-4) The mean epochs are given in Julian years.
	^(1-2-6) This goodness of fit is the ratio of the scatter-based and the model-based error. It is only defined when Num > 2. Values exceeding 9.9 are truncated to 9.9.
	^(1-2-7) Blank when no magnitude is available. Either BTmag or VTmag is always given. Approximate Johnson photometry may be obtained as: V = VT -0.090(BT-VT) B-V = 0.850(BT-VT) Consult Sect 1.3 of Vol 1 of "The Hipparcos and Tycho Catalogues", ESA SP-1200, 1997, for details.
	^(1-2-8) Distance in units of 100 mas to the nearest entry in the Tycho-2 main catalogue or supplement. The distance is computed for the epoch 1991.25. A value of 999 (i.e. 99.9 arcsec) is given if the distance exceeds 99.9 arcsec.
	^(1-2-9) ' ' = no Tycho-1 star was found within 0.8 arcsec (quality 1-8) or 2.4 arcsec (quality 9). 'T' = this is a Tycho-1 star. The Tycho-1 identifier is given in the beginning of the record. For Tycho-1 stars, resolved in Tycho-2 as a close pair, both components are flagged as a Tycho-1 star and the Tycho-1 TYC3 is assigned to the brightest (VT) component. The HIP-only stars given in Tycho-1 are not flagged as Tycho-1 stars.
	^(1-2-10) The CCDM component identifiers for double or multiple Hipparcos stars contributing to this Tycho-2 entry. For photocentre solutions, all components within 0.8 arcsec contribute. For double star solutions any unresolved component within 0.8 arcsec contributes. For single star solutions, the predicted signal from close stars were normally subtracted in the analysis of the photon counts and such stars therefore do not contribute to the solution. The components are given in lexical order.
	^(1-2-11) ' ' = normal treatment, close stars were subtracted when possible. 'D' = double star treatment. Two stars were found. The companion is normally included as a separate Tycho-2 entry, but may have been rejected. 'P' = photocentre treatment, close stars were not subtracted. This special treatment was applied to known or suspected doubles which were not successfully (or reliably) resolved in the Tycho-2 double star processing.

1259_tyc2_02.dat - *The Tycho-2 main catalogue
View this Data Download via FTP

Field	Label	Units	Format	Definition
1	TYC1	---	I4	[1,9537]+= TYC1 from TYC or GSC (1)^(1-3-1)
2	TYC2	---	I5	[1,12121] TYC2 from TYC or GSC (1)^(1-3-1)
3	TYC3	---	I2	[1,3] TYC3 from TYC (1)^(1-3-1)
4	pflag	---	A1	[ PX] mean position flag (2)^(1-3-2)
5	RAmdeg	deg	F12.8	[]? Mean Right Asc, ICRS, epoch=J2000 (3)^(1-3-3)
6	DEmdeg	deg	F12.8	[]? Mean Decl, ICRS, at epoch=J2000 (3)^(1-3-3)
7	pmRA	mas/yr	F7.1	[-4418.0,6544.2]? prop. mot. in RA*cos(dec)
8	pmDE	mas/yr	F7.1	[-5774.3,10277.3]? prop. mot. in Dec
9	e_RAmdeg	mas	I3	[3,183]? s.e. RA*cos(dec),at mean epoch (5)^(1-3-5)
10	e_DEmdeg	mas	I3	[1,184]? s.e. of Dec at mean epoch (5)^(1-3-5)
11	e_pmRA	mas/yr	F4.1	[0.2,11.5]? s.e. prop mot in RA*cos(dec)(5)^(1-3-5)
12	e_pmDE	mas/yr	F4.1	[0.2,10.3]? s.e. of proper motion in Dec(5)^(1-3-5)
13	EpRAm	yr	F7.2	[1915.95,1992.53]? mean epoch of RA (4)^(1-3-4)
14	EpDEm	yr	F7.2	[1911.94,1992.01]? mean epoch of Dec (4)^(1-3-4)
15	Num	---	I2	[2,36]? Number of positions used
16	q_RAmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean RA (6)^(1-3-6)
17	q_DEmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean Dec (6)^(1-3-6)
18	q_pmRA	---	F4.1	[0.0,9.9]? Goodness of fit for pmRA (6)^(1-3-6)
19	q_pmDE	---	F4.1	[0.0,9.9]? Goodness of fit for pmDE (6)^(1-3-6)
20	BTmag	mag	F6.3	[2.183,16.581]? Tycho-2 BT magnitude (7)^(1-3-7)
21	e_BTmag	mag	F6.3	[0.014,1.977]? s.e. of BT (7)^(1-3-7)
22	VTmag	mag	F6.3	[1.905,15.193]? Tycho-2 VT magnitude (7)^(1-3-7)
23	e_VTmag	mag	F6.3	[0.009,1.468]? s.e. of VT (7)^(1-3-7)
24	prox	---	I3	[3,999] proximity indicator (8)^(1-3-8)
25	TYC	---	A1	[T] Tycho-1 star (9)^(1-3-9)
26	HIP	---	I6	[1,120404]? Hipparcos number
27	CCDM	---	A3	CCDM component identifier for HIP stars(10)^(1-3-10)
28	RAdeg	deg	F12.8	Observed Tycho-2 Right Ascension, ICRS
29	DEdeg	deg	F12.8	Observed Tycho-2 Declination, ICRS
30	EpRA-1990	yr	F5.2	[0.81,2.13] epoch-1990 of RAdeg
31	EpDE-1990	yr	F5.2	[0.72,2.36] epoch-1990 of DEdeg
32	e_RAdeg	mas	F5.1	s.e.RA*cos(dec), of observed Tycho-2 RA (5)^(1-3-5)
33	e_DEdeg	mas	F5.1	s.e. of observed Tycho-2 Dec (5)^(1-3-5)
34	posflg	---	A1	[ DP] type of Tycho-2 solution (11)^(1-3-11)
35	corr	---	F4.1	[-1,1] correlation (RAdeg,DEdeg)

	^(1-3-1)The TYC identifier is constructed from the GSC region number (TYC1), the running number within the region (TYC2) and a component identifier (TYC3) which is normally 1. Some non-GSC running numbers were constructed for the first Tycho Catalogue and for Tycho-2. The recommended star designation contains a hyphen between the TYC numbers, e.g. TYC 1-13-1.
	^(1-3-2) ' ' = normal mean position and proper motion. 'P' = the mean position, proper motion, etc., refer to the photocentre of two Tycho-2 entries, where the BT magnitudes were used in weighting the positions. 'X' = no mean position, no proper motion.
	^(1-3-3) The mean position is a weighted mean for the catalogues contributing to the proper motion determination. This mean has then been brought to epoch 2000.0 by the computed proper motion. See Note(2) above for details. Tycho-2 is one of the several catalogues used to determine the mean position and proper motion. The observed Tycho-2 position is given in the fields RAdeg and DEdeg.
	^(1-3-5)The errors are based on error models.
	^(1-3-4)The mean epochs are given in Julian years.
	^(1-3-6)This goodness of fit is the ratio of the scatter-based and the model-based error. It is only defined when Num > 2. Values exceeding 9.9 are truncated to 9.9.
	^(1-3-7) Blank when no magnitude is available. Either BTmag or VTmag is always given. Approximate Johnson photometry may be obtained as: V = VT -0.090(BT-VT) B-V = 0.850(BT-VT) Consult Sect 1.3 of Vol 1 of "The Hipparcos and Tycho Catalogues", ESA SP-1200, 1997, for details.
	^(1-3-8) Distance in units of 100 mas to the nearest entry in the Tycho-2 main catalogue or supplement. The distance is computed for the epoch 1991.25. A value of 999 (i.e. 99.9 arcsec) is given if the distance exceeds 99.9 arcsec.
	^(1-3-9) ' ' = no Tycho-1 star was found within 0.8 arcsec (quality 1-8) or 2.4 arcsec (quality 9). 'T' = this is a Tycho-1 star. The Tycho-1 identifier is given in the beginning of the record. For Tycho-1 stars, resolved in Tycho-2 as a close pair, both components are flagged as a Tycho-1 star and the Tycho-1 TYC3 is assigned to the brightest (VT) component. The HIP-only stars given in Tycho-1 are not flagged as Tycho-1 stars.
	^(1-3-10) The CCDM component identifiers for double or multiple Hipparcos stars contributing to this Tycho-2 entry. For photocentre solutions, all components within 0.8 arcsec contribute. For double star solutions any unresolved component within 0.8 arcsec contributes. For single star solutions, the predicted signal from close stars were normally subtracted in the analysis of the photon counts and such stars therefore do not contribute to the solution. The components are given in lexical order.
	^(1-3-11) ' ' = normal treatment, close stars were subtracted when possible. 'D' = double star treatment. Two stars were found. The companion is normally included as a separate Tycho-2 entry, but may have been rejected. 'P' = photocentre treatment, close stars were not subtracted. This special treatment was applied to known or suspected doubles which were not successfully (or reliably) resolved in the Tycho-2 double star processing.

1259_tyc2_03.dat - *The Tycho-2 main catalogue
View this Data Download via FTP

Field	Label	Units	Format	Definition
1	TYC1	---	I4	[1,9537]+= TYC1 from TYC or GSC (1)^(1-4-1)
2	TYC2	---	I5	[1,12121] TYC2 from TYC or GSC (1)^(1-4-1)
3	TYC3	---	I2	[1,3] TYC3 from TYC (1)^(1-4-1)
4	pflag	---	A1	[ PX] mean position flag (2)^(1-4-2)
5	RAmdeg	deg	F12.8	[]? Mean Right Asc, ICRS, epoch=J2000 (3)^(1-4-3)
6	DEmdeg	deg	F12.8	[]? Mean Decl, ICRS, at epoch=J2000 (3)^(1-4-3)
7	pmRA	mas/yr	F7.1	[-4418.0,6544.2]? prop. mot. in RA*cos(dec)
8	pmDE	mas/yr	F7.1	[-5774.3,10277.3]? prop. mot. in Dec
9	e_RAmdeg	mas	I3	[3,183]? s.e. RA*cos(dec),at mean epoch (5)^(1-4-5)
10	e_DEmdeg	mas	I3	[1,184]? s.e. of Dec at mean epoch (5)^(1-4-5)
11	e_pmRA	mas/yr	F4.1	[0.2,11.5]? s.e. prop mot in RA*cos(dec)(5)^(1-4-5)
12	e_pmDE	mas/yr	F4.1	[0.2,10.3]? s.e. of proper motion in Dec(5)^(1-4-5)
13	EpRAm	yr	F7.2	[1915.95,1992.53]? mean epoch of RA (4)^(1-4-4)
14	EpDEm	yr	F7.2	[1911.94,1992.01]? mean epoch of Dec (4)^(1-4-4)
15	Num	---	I2	[2,36]? Number of positions used
16	q_RAmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean RA (6)^(1-4-6)
17	q_DEmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean Dec (6)^(1-4-6)
18	q_pmRA	---	F4.1	[0.0,9.9]? Goodness of fit for pmRA (6)^(1-4-6)
19	q_pmDE	---	F4.1	[0.0,9.9]? Goodness of fit for pmDE (6)^(1-4-6)
20	BTmag	mag	F6.3	[2.183,16.581]? Tycho-2 BT magnitude (7)^(1-4-7)
21	e_BTmag	mag	F6.3	[0.014,1.977]? s.e. of BT (7)^(1-4-7)
22	VTmag	mag	F6.3	[1.905,15.193]? Tycho-2 VT magnitude (7)^(1-4-7)
23	e_VTmag	mag	F6.3	[0.009,1.468]? s.e. of VT (7)^(1-4-7)
24	prox	---	I3	[3,999] proximity indicator (8)^(1-4-8)
25	TYC	---	A1	[T] Tycho-1 star (9)^(1-4-9)
26	HIP	---	I6	[1,120404]? Hipparcos number
27	CCDM	---	A3	CCDM component identifier for HIP stars(10)^(1-4-10)
28	RAdeg	deg	F12.8	Observed Tycho-2 Right Ascension, ICRS
29	DEdeg	deg	F12.8	Observed Tycho-2 Declination, ICRS
30	EpRA-1990	yr	F5.2	[0.81,2.13] epoch-1990 of RAdeg
31	EpDE-1990	yr	F5.2	[0.72,2.36] epoch-1990 of DEdeg
32	e_RAdeg	mas	F5.1	s.e.RA*cos(dec), of observed Tycho-2 RA (5)^(1-4-5)
33	e_DEdeg	mas	F5.1	s.e. of observed Tycho-2 Dec (5)^(1-4-5)
34	posflg	---	A1	[ DP] type of Tycho-2 solution (11)^(1-4-11)
35	corr	---	F4.1	[-1,1] correlation (RAdeg,DEdeg)

	^(1-4-1)The TYC identifier is constructed from the GSC region number (TYC1), the running number within the region (TYC2) and a component identifier (TYC3) which is normally 1. Some non-GSC running numbers were constructed for the first Tycho Catalogue and for Tycho-2. The recommended star designation contains a hyphen between the TYC numbers, e.g. TYC 1-13-1.
	^(1-4-2) ' ' = normal mean position and proper motion. 'P' = the mean position, proper motion, etc., refer to the photocentre of two Tycho-2 entries, where the BT magnitudes were used in weighting the positions. 'X' = no mean position, no proper motion.
	^(1-4-3) The mean position is a weighted mean for the catalogues contributing to the proper motion determination. This mean has then been brought to epoch 2000.0 by the computed proper motion. See Note(2) above for details. Tycho-2 is one of the several catalogues used to determine the mean position and proper motion. The observed Tycho-2 position is given in the fields RAdeg and DEdeg.
	^(1-4-5)The errors are based on error models.
	^(1-4-4)The mean epochs are given in Julian years.
	^(1-4-6)This goodness of fit is the ratio of the scatter-based and the model-based error. It is only defined when Num > 2. Values exceeding 9.9 are truncated to 9.9.
	^(1-4-7) Blank when no magnitude is available. Either BTmag or VTmag is always given. Approximate Johnson photometry may be obtained as: V = VT -0.090(BT-VT) B-V = 0.850(BT-VT) Consult Sect 1.3 of Vol 1 of "The Hipparcos and Tycho Catalogues", ESA SP-1200, 1997, for details.
	^(1-4-8) Distance in units of 100 mas to the nearest entry in the Tycho-2 main catalogue or supplement. The distance is computed for the epoch 1991.25. A value of 999 (i.e. 99.9 arcsec) is given if the distance exceeds 99.9 arcsec.
	^(1-4-9) ' ' = no Tycho-1 star was found within 0.8 arcsec (quality 1-8) or 2.4 arcsec (quality 9). 'T' = this is a Tycho-1 star. The Tycho-1 identifier is given in the beginning of the record. For Tycho-1 stars, resolved in Tycho-2 as a close pair, both components are flagged as a Tycho-1 star and the Tycho-1 TYC3 is assigned to the brightest (VT) component. The HIP-only stars given in Tycho-1 are not flagged as Tycho-1 stars.
	^(1-4-10) The CCDM component identifiers for double or multiple Hipparcos stars contributing to this Tycho-2 entry. For photocentre solutions, all components within 0.8 arcsec contribute. For double star solutions any unresolved component within 0.8 arcsec contributes. For single star solutions, the predicted signal from close stars were normally subtracted in the analysis of the photon counts and such stars therefore do not contribute to the solution. The components are given in lexical order.
	^(1-4-11) ' ' = normal treatment, close stars were subtracted when possible. 'D' = double star treatment. Two stars were found. The companion is normally included as a separate Tycho-2 entry, but may have been rejected. 'P' = photocentre treatment, close stars were not subtracted. This special treatment was applied to known or suspected doubles which were not successfully (or reliably) resolved in the Tycho-2 double star processing.

1259_tyc2_04.dat - *The Tycho-2 main catalogue
View this Data Download via FTP

Field	Label	Units	Format	Definition
1	TYC1	---	I4	[1,9537]+= TYC1 from TYC or GSC (1)^(1-5-1)
2	TYC2	---	I5	[1,12121] TYC2 from TYC or GSC (1)^(1-5-1)
3	TYC3	---	I2	[1,3] TYC3 from TYC (1)^(1-5-1)
4	pflag	---	A1	[ PX] mean position flag (2)^(1-5-2)
5	RAmdeg	deg	F12.8	[]? Mean Right Asc, ICRS, epoch=J2000 (3)^(1-5-3)
6	DEmdeg	deg	F12.8	[]? Mean Decl, ICRS, at epoch=J2000 (3)^(1-5-3)
7	pmRA	mas/yr	F7.1	[-4418.0,6544.2]? prop. mot. in RA*cos(dec)
8	pmDE	mas/yr	F7.1	[-5774.3,10277.3]? prop. mot. in Dec
9	e_RAmdeg	mas	I3	[3,183]? s.e. RA*cos(dec),at mean epoch (5)^(1-5-5)
10	e_DEmdeg	mas	I3	[1,184]? s.e. of Dec at mean epoch (5)^(1-5-5)
11	e_pmRA	mas/yr	F4.1	[0.2,11.5]? s.e. prop mot in RA*cos(dec)(5)^(1-5-5)
12	e_pmDE	mas/yr	F4.1	[0.2,10.3]? s.e. of proper motion in Dec(5)^(1-5-5)
13	EpRAm	yr	F7.2	[1915.95,1992.53]? mean epoch of RA (4)^(1-5-4)
14	EpDEm	yr	F7.2	[1911.94,1992.01]? mean epoch of Dec (4)^(1-5-4)
15	Num	---	I2	[2,36]? Number of positions used
16	q_RAmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean RA (6)^(1-5-6)
17	q_DEmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean Dec (6)^(1-5-6)
18	q_pmRA	---	F4.1	[0.0,9.9]? Goodness of fit for pmRA (6)^(1-5-6)
19	q_pmDE	---	F4.1	[0.0,9.9]? Goodness of fit for pmDE (6)^(1-5-6)
20	BTmag	mag	F6.3	[2.183,16.581]? Tycho-2 BT magnitude (7)^(1-5-7)
21	e_BTmag	mag	F6.3	[0.014,1.977]? s.e. of BT (7)^(1-5-7)
22	VTmag	mag	F6.3	[1.905,15.193]? Tycho-2 VT magnitude (7)^(1-5-7)
23	e_VTmag	mag	F6.3	[0.009,1.468]? s.e. of VT (7)^(1-5-7)
24	prox	---	I3	[3,999] proximity indicator (8)^(1-5-8)
25	TYC	---	A1	[T] Tycho-1 star (9)^(1-5-9)
26	HIP	---	I6	[1,120404]? Hipparcos number
27	CCDM	---	A3	CCDM component identifier for HIP stars(10)^(1-5-10)
28	RAdeg	deg	F12.8	Observed Tycho-2 Right Ascension, ICRS
29	DEdeg	deg	F12.8	Observed Tycho-2 Declination, ICRS
30	EpRA-1990	yr	F5.2	[0.81,2.13] epoch-1990 of RAdeg
31	EpDE-1990	yr	F5.2	[0.72,2.36] epoch-1990 of DEdeg
32	e_RAdeg	mas	F5.1	s.e.RA*cos(dec), of observed Tycho-2 RA (5)^(1-5-5)
33	e_DEdeg	mas	F5.1	s.e. of observed Tycho-2 Dec (5)^(1-5-5)
34	posflg	---	A1	[ DP] type of Tycho-2 solution (11)^(1-5-11)
35	corr	---	F4.1	[-1,1] correlation (RAdeg,DEdeg)

	^(1-5-1)The TYC identifier is constructed from the GSC region number (TYC1), the running number within the region (TYC2) and a component identifier (TYC3) which is normally 1. Some non-GSC running numbers were constructed for the first Tycho Catalogue and for Tycho-2. The recommended star designation contains a hyphen between the TYC numbers, e.g. TYC 1-13-1.
	^(1-5-2) ' ' = normal mean position and proper motion. 'P' = the mean position, proper motion, etc., refer to the photocentre of two Tycho-2 entries, where the BT magnitudes were used in weighting the positions. 'X' = no mean position, no proper motion.
	^(1-5-3) The mean position is a weighted mean for the catalogues contributing to the proper motion determination. This mean has then been brought to epoch 2000.0 by the computed proper motion. See Note(2) above for details. Tycho-2 is one of the several catalogues used to determine the mean position and proper motion. The observed Tycho-2 position is given in the fields RAdeg and DEdeg.
	^(1-5-5)The errors are based on error models.
	^(1-5-4)The mean epochs are given in Julian years.
	^(1-5-6) This goodness of fit is the ratio of the scatter-based and the model-based error. It is only defined when Num > 2. Values exceeding 9.9 are truncated to 9.9.
	^(1-5-7) Blank when no magnitude is available. Either BTmag or VTmag is always given. Approximate Johnson photometry may be obtained as: V = VT -0.090(BT-VT) B-V = 0.850(BT-VT) Consult Sect 1.3 of Vol 1 of "The Hipparcos and Tycho Catalogues", ESA SP-1200, 1997, for details.
	^(1-5-8) Distance in units of 100 mas to the nearest entry in the Tycho-2 main catalogue or supplement. The distance is computed for the epoch 1991.25. A value of 999 (i.e. 99.9 arcsec) is given if the distance exceeds 99.9 arcsec.
	^(1-5-9) ' ' = no Tycho-1 star was found within 0.8 arcsec (quality 1-8) or 2.4 arcsec (quality 9). 'T' = this is a Tycho-1 star. The Tycho-1 identifier is given in the beginning of the record. For Tycho-1 stars, resolved in Tycho-2 as a close pair, both components are flagged as a Tycho-1 star and the Tycho-1 TYC3 is assigned to the brightest (VT) component. The HIP-only stars given in Tycho-1 are not flagged as Tycho-1 stars.
	^(1-5-10) The CCDM component identifiers for double or multiple Hipparcos stars contributing to this Tycho-2 entry. For photocentre solutions, all components within 0.8 arcsec contribute. For double star solutions any unresolved component within 0.8 arcsec contributes. For single star solutions, the predicted signal from close stars were normally subtracted in the analysis of the photon counts and such stars therefore do not contribute to the solution. The components are given in lexical order.
	^(1-5-11) ' ' = normal treatment, close stars were subtracted when possible. 'D' = double star treatment. Two stars were found. The companion is normally included as a separate Tycho-2 entry, but may have been rejected. 'P' = photocentre treatment, close stars were not subtracted. This special treatment was applied to known or suspected doubles which were not successfully (or reliably) resolved in the Tycho-2 double star processing.

1259_tyc2_05.dat - *The Tycho-2 main catalogue
View this Data Download via FTP

Field	Label	Units	Format	Definition
1	TYC1	---	I4	[1,9537]+= TYC1 from TYC or GSC (1)^(1-6-1)
2	TYC2	---	I5	[1,12121] TYC2 from TYC or GSC (1)^(1-6-1)
3	TYC3	---	I2	[1,3] TYC3 from TYC (1)^(1-6-1)
4	pflag	---	A1	[ PX] mean position flag (2)^(1-6-2)
5	RAmdeg	deg	F12.8	[]? Mean Right Asc, ICRS, epoch=J2000 (3)^(1-6-3)
6	DEmdeg	deg	F12.8	[]? Mean Decl, ICRS, at epoch=J2000 (3)^(1-6-3)
7	pmRA	mas/yr	F7.1	[-4418.0,6544.2]? prop. mot. in RA*cos(dec)
8	pmDE	mas/yr	F7.1	[-5774.3,10277.3]? prop. mot. in Dec
9	e_RAmdeg	mas	I3	[3,183]? s.e. RA*cos(dec),at mean epoch (5)^(1-6-5)
10	e_DEmdeg	mas	I3	[1,184]? s.e. of Dec at mean epoch (5)^(1-6-5)
11	e_pmRA	mas/yr	F4.1	[0.2,11.5]? s.e. prop mot in RA*cos(dec)(5)^(1-6-5)
12	e_pmDE	mas/yr	F4.1	[0.2,10.3]? s.e. of proper motion in Dec(5)^(1-6-5)
13	EpRAm	yr	F7.2	[1915.95,1992.53]? mean epoch of RA (4)^(1-6-4)
14	EpDEm	yr	F7.2	[1911.94,1992.01]? mean epoch of Dec (4)^(1-6-4)
15	Num	---	I2	[2,36]? Number of positions used
16	q_RAmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean RA (6)^(1-6-6)
17	q_DEmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean Dec (6)^(1-6-6)
18	q_pmRA	---	F4.1	[0.0,9.9]? Goodness of fit for pmRA (6)^(1-6-6)
19	q_pmDE	---	F4.1	[0.0,9.9]? Goodness of fit for pmDE (6)^(1-6-6)
20	BTmag	mag	F6.3	[2.183,16.581]? Tycho-2 BT magnitude (7)^(1-6-7)
21	e_BTmag	mag	F6.3	[0.014,1.977]? s.e. of BT (7)^(1-6-7)
22	VTmag	mag	F6.3	[1.905,15.193]? Tycho-2 VT magnitude (7)^(1-6-7)
23	e_VTmag	mag	F6.3	[0.009,1.468]? s.e. of VT (7)^(1-6-7)
24	prox	---	I3	[3,999] proximity indicator (8)^(1-6-8)
25	TYC	---	A1	[T] Tycho-1 star (9)^(1-6-9)
26	HIP	---	I6	[1,120404]? Hipparcos number
27	CCDM	---	A3	CCDM component identifier for HIP stars(10)^(1-6-10)
28	RAdeg	deg	F12.8	Observed Tycho-2 Right Ascension, ICRS
29	DEdeg	deg	F12.8	Observed Tycho-2 Declination, ICRS
30	EpRA-1990	yr	F5.2	[0.81,2.13] epoch-1990 of RAdeg
31	EpDE-1990	yr	F5.2	[0.72,2.36] epoch-1990 of DEdeg
32	e_RAdeg	mas	F5.1	s.e.RA*cos(dec), of observed Tycho-2 RA (5)^(1-6-5)
33	e_DEdeg	mas	F5.1	s.e. of observed Tycho-2 Dec (5)^(1-6-5)
34	posflg	---	A1	[ DP] type of Tycho-2 solution (11)^(1-6-11)
35	corr	---	F4.1	[-1,1] correlation (RAdeg,DEdeg)

	^(1-6-1)The TYC identifier is constructed from the GSC region number (TYC1), the running number within the region (TYC2) and a component identifier (TYC3) which is normally 1. Some non-GSC running numbers were constructed for the first Tycho Catalogue and for Tycho-2. The recommended star designation contains a hyphen between the TYC numbers, e.g. TYC 1-13-1.
	^(1-6-2) ' ' = normal mean position and proper motion. 'P' = the mean position, proper motion, etc., refer to the photocentre of two Tycho-2 entries, where the BT magnitudes were used in weighting the positions. 'X' = no mean position, no proper motion.
	^(1-6-3) The mean position is a weighted mean for the catalogues contributing to the proper motion determination. This mean has then been brought to epoch 2000.0 by the computed proper motion. See Note(2) above for details. Tycho-2 is one of the several catalogues used to determine the mean position and proper motion. The observed Tycho-2 position is given in the fields RAdeg and DEdeg.
	^(1-6-5)The errors are based on error models.
	^(1-6-4)The mean epochs are given in Julian years.
	^(1-6-6) This goodness of fit is the ratio of the scatter-based and the model-based error. It is only defined when Num > 2. Values exceeding 9.9 are truncated to 9.9.
	^(1-6-7) Blank when no magnitude is available. Either BTmag or VTmag is always given. Approximate Johnson photometry may be obtained as: V = VT -0.090(BT-VT) B-V = 0.850(BT-VT) Consult Sect 1.3 of Vol 1 of "The Hipparcos and Tycho Catalogues", ESA SP-1200, 1997, for details.
	^(1-6-8) Distance in units of 100 mas to the nearest entry in the Tycho-2 main catalogue or supplement. The distance is computed for the epoch 1991.25. A value of 999 (i.e. 99.9 arcsec) is given if the distance exceeds 99.9 arcsec.
	^(1-6-9) ' ' = no Tycho-1 star was found within 0.8 arcsec (quality 1-8) or 2.4 arcsec (quality 9). 'T' = this is a Tycho-1 star. The Tycho-1 identifier is given in the beginning of the record. For Tycho-1 stars, resolved in Tycho-2 as a close pair, both components are flagged as a Tycho-1 star and the Tycho-1 TYC3 is assigned to the brightest (VT) component. The HIP-only stars given in Tycho-1 are not flagged as Tycho-1 stars.
	^(1-6-10) The CCDM component identifiers for double or multiple Hipparcos stars contributing to this Tycho-2 entry. For photocentre solutions, all components within 0.8 arcsec contribute. For double star solutions any unresolved component within 0.8 arcsec contributes. For single star solutions, the predicted signal from close stars were normally subtracted in the analysis of the photon counts and such stars therefore do not contribute to the solution. The components are given in lexical order.
	^(1-6-11) ' ' = normal treatment, close stars were subtracted when possible. 'D' = double star treatment. Two stars were found. The companion is normally included as a separate Tycho-2 entry, but may have been rejected. 'P' = photocentre treatment, close stars were not subtracted. This special treatment was applied to known or suspected doubles which were not successfully (or reliably) resolved in the Tycho-2 double star processing.

1259_tyc2_06.dat - *The Tycho-2 main catalogue
View this Data Download via FTP

Field	Label	Units	Format	Definition
1	TYC1	---	I4	[1,9537]+= TYC1 from TYC or GSC (1)^(1-7-1)
2	TYC2	---	I5	[1,12121] TYC2 from TYC or GSC (1)^(1-7-1)
3	TYC3	---	I2	[1,3] TYC3 from TYC (1)^(1-7-1)
4	pflag	---	A1	[ PX] mean position flag (2)^(1-7-2)
5	RAmdeg	deg	F12.8	[]? Mean Right Asc, ICRS, epoch=J2000 (3)^(1-7-3)
6	DEmdeg	deg	F12.8	[]? Mean Decl, ICRS, at epoch=J2000 (3)^(1-7-3)
7	pmRA	mas/yr	F7.1	[-4418.0,6544.2]? prop. mot. in RA*cos(dec)
8	pmDE	mas/yr	F7.1	[-5774.3,10277.3]? prop. mot. in Dec
9	e_RAmdeg	mas	I3	[3,183]? s.e. RA*cos(dec),at mean epoch (5)^(1-7-5)
10	e_DEmdeg	mas	I3	[1,184]? s.e. of Dec at mean epoch (5)^(1-7-5)
11	e_pmRA	mas/yr	F4.1	[0.2,11.5]? s.e. prop mot in RA*cos(dec)(5)^(1-7-5)
12	e_pmDE	mas/yr	F4.1	[0.2,10.3]? s.e. of proper motion in Dec(5)^(1-7-5)
13	EpRAm	yr	F7.2	[1915.95,1992.53]? mean epoch of RA (4)^(1-7-4)
14	EpDEm	yr	F7.2	[1911.94,1992.01]? mean epoch of Dec (4)^(1-7-4)
15	Num	---	I2	[2,36]? Number of positions used
16	q_RAmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean RA (6)^(1-7-6)
17	q_DEmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean Dec (6)^(1-7-6)
18	q_pmRA	---	F4.1	[0.0,9.9]? Goodness of fit for pmRA (6)^(1-7-6)
19	q_pmDE	---	F4.1	[0.0,9.9]? Goodness of fit for pmDE (6)^(1-7-6)
20	BTmag	mag	F6.3	[2.183,16.581]? Tycho-2 BT magnitude (7)^(1-7-7)
21	e_BTmag	mag	F6.3	[0.014,1.977]? s.e. of BT (7)^(1-7-7)
22	VTmag	mag	F6.3	[1.905,15.193]? Tycho-2 VT magnitude (7)^(1-7-7)
23	e_VTmag	mag	F6.3	[0.009,1.468]? s.e. of VT (7)^(1-7-7)
24	prox	---	I3	[3,999] proximity indicator (8)^(1-7-8)
25	TYC	---	A1	[T] Tycho-1 star (9)^(1-7-9)
26	HIP	---	I6	[1,120404]? Hipparcos number
27	CCDM	---	A3	CCDM component identifier for HIP stars(10)^(1-7-10)
28	RAdeg	deg	F12.8	Observed Tycho-2 Right Ascension, ICRS
29	DEdeg	deg	F12.8	Observed Tycho-2 Declination, ICRS
30	EpRA-1990	yr	F5.2	[0.81,2.13] epoch-1990 of RAdeg
31	EpDE-1990	yr	F5.2	[0.72,2.36] epoch-1990 of DEdeg
32	e_RAdeg	mas	F5.1	s.e.RA*cos(dec), of observed Tycho-2 RA (5)^(1-7-5)
33	e_DEdeg	mas	F5.1	s.e. of observed Tycho-2 Dec (5)^(1-7-5)
34	posflg	---	A1	[ DP] type of Tycho-2 solution (11)^(1-7-11)
35	corr	---	F4.1	[-1,1] correlation (RAdeg,DEdeg)

	^(1-7-1)The TYC identifier is constructed from the GSC region number (TYC1), the running number within the region (TYC2) and a component identifier (TYC3) which is normally 1. Some non-GSC running numbers were constructed for the first Tycho Catalogue and for Tycho-2. The recommended star designation contains a hyphen between the TYC numbers, e.g. TYC 1-13-1.
	^(1-7-2) ' ' = normal mean position and proper motion. 'P' = the mean position, proper motion, etc., refer to the photocentre of two Tycho-2 entries, where the BT magnitudes were used in weighting the positions. 'X' = no mean position, no proper motion.
	^(1-7-3) The mean position is a weighted mean for the catalogues contributing to the proper motion determination. This mean has then been brought to epoch 2000.0 by the computed proper motion. See Note(2) above for details. Tycho-2 is one of the several catalogues used to determine the mean position and proper motion. The observed Tycho-2 position is given in the fields RAdeg and DEdeg.
	^(1-7-5)The errors are based on error models.
	^(1-7-4)The mean epochs are given in Julian years.
	^(1-7-6) This goodness of fit is the ratio of the scatter-based and the model-based error. It is only defined when Num > 2. Values exceeding 9.9 are truncated to 9.9.
	^(1-7-7) Blank when no magnitude is available. Either BTmag or VTmag is always given. Approximate Johnson photometry may be obtained as: V = VT -0.090(BT-VT) B-V = 0.850(BT-VT) Consult Sect 1.3 of Vol 1 of "The Hipparcos and Tycho Catalogues", ESA SP-1200, 1997, for details.
	^(1-7-8) Distance in units of 100 mas to the nearest entry in the Tycho-2 main catalogue or supplement. The distance is computed for the epoch 1991.25. A value of 999 (i.e. 99.9 arcsec) is given if the distance exceeds 99.9 arcsec.
	^(1-7-9) ' ' = no Tycho-1 star was found within 0.8 arcsec (quality 1-8) or 2.4 arcsec (quality 9). 'T' = this is a Tycho-1 star. The Tycho-1 identifier is given in the beginning of the record. For Tycho-1 stars, resolved in Tycho-2 as a close pair, both components are flagged as a Tycho-1 star and the Tycho-1 TYC3 is assigned to the brightest (VT) component. The HIP-only stars given in Tycho-1 are not flagged as Tycho-1 stars.
	^(1-7-10) The CCDM component identifiers for double or multiple Hipparcos stars contributing to this Tycho-2 entry. For photocentre solutions, all components within 0.8 arcsec contribute. For double star solutions any unresolved component within 0.8 arcsec contributes. For single star solutions, the predicted signal from close stars were normally subtracted in the analysis of the photon counts and such stars therefore do not contribute to the solution. The components are given in lexical order.
	^(1-7-11) ' ' = normal treatment, close stars were subtracted when possible. 'D' = double star treatment. Two stars were found. The companion is normally included as a separate Tycho-2 entry, but may have been rejected. 'P' = photocentre treatment, close stars were not subtracted. This special treatment was applied to known or suspected doubles which were not successfully (or reliably) resolved in the Tycho-2 double star processing.

1259_tyc2_07.dat - *The Tycho-2 main catalogue
View this Data Download via FTP

Field	Label	Units	Format	Definition
1	TYC1	---	I4	[1,9537]+= TYC1 from TYC or GSC (1)^(1-8-1)
2	TYC2	---	I5	[1,12121] TYC2 from TYC or GSC (1)^(1-8-1)
3	TYC3	---	I2	[1,3] TYC3 from TYC (1)^(1-8-1)
4	pflag	---	A1	[ PX] mean position flag (2)^(1-8-2)
5	RAmdeg	deg	F12.8	[]? Mean Right Asc, ICRS, epoch=J2000 (3)^(1-8-3)
6	DEmdeg	deg	F12.8	[]? Mean Decl, ICRS, at epoch=J2000 (3)^(1-8-3)
7	pmRA	mas/yr	F7.1	[-4418.0,6544.2]? prop. mot. in RA*cos(dec)
8	pmDE	mas/yr	F7.1	[-5774.3,10277.3]? prop. mot. in Dec
9	e_RAmdeg	mas	I3	[3,183]? s.e. RA*cos(dec),at mean epoch (5)^(1-8-5)
10	e_DEmdeg	mas	I3	[1,184]? s.e. of Dec at mean epoch (5)^(1-8-5)
11	e_pmRA	mas/yr	F4.1	[0.2,11.5]? s.e. prop mot in RA*cos(dec)(5)^(1-8-5)
12	e_pmDE	mas/yr	F4.1	[0.2,10.3]? s.e. of proper motion in Dec(5)^(1-8-5)
13	EpRAm	yr	F7.2	[1915.95,1992.53]? mean epoch of RA (4)^(1-8-4)
14	EpDEm	yr	F7.2	[1911.94,1992.01]? mean epoch of Dec (4)^(1-8-4)
15	Num	---	I2	[2,36]? Number of positions used
16	q_RAmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean RA (6)^(1-8-6)
17	q_DEmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean Dec (6)^(1-8-6)
18	q_pmRA	---	F4.1	[0.0,9.9]? Goodness of fit for pmRA (6)^(1-8-6)
19	q_pmDE	---	F4.1	[0.0,9.9]? Goodness of fit for pmDE (6)^(1-8-6)
20	BTmag	mag	F6.3	[2.183,16.581]? Tycho-2 BT magnitude (7)^(1-8-7)
21	e_BTmag	mag	F6.3	[0.014,1.977]? s.e. of BT (7)^(1-8-7)
22	VTmag	mag	F6.3	[1.905,15.193]? Tycho-2 VT magnitude (7)^(1-8-7)
23	e_VTmag	mag	F6.3	[0.009,1.468]? s.e. of VT (7)^(1-8-7)
24	prox	---	I3	[3,999] proximity indicator (8)^(1-8-8)
25	TYC	---	A1	[T] Tycho-1 star (9)^(1-8-9)
26	HIP	---	I6	[1,120404]? Hipparcos number
27	CCDM	---	A3	CCDM component identifier for HIP stars(10)^(1-8-10)
28	RAdeg	deg	F12.8	Observed Tycho-2 Right Ascension, ICRS
29	DEdeg	deg	F12.8	Observed Tycho-2 Declination, ICRS
30	EpRA-1990	yr	F5.2	[0.81,2.13] epoch-1990 of RAdeg
31	EpDE-1990	yr	F5.2	[0.72,2.36] epoch-1990 of DEdeg
32	e_RAdeg	mas	F5.1	s.e.RA*cos(dec), of observed Tycho-2 RA (5)^(1-8-5)
33	e_DEdeg	mas	F5.1	s.e. of observed Tycho-2 Dec (5)^(1-8-5)
34	posflg	---	A1	[ DP] type of Tycho-2 solution (11)^(1-8-11)
35	corr	---	F4.1	[-1,1] correlation (RAdeg,DEdeg)

	^(1-8-1)The TYC identifier is constructed from the GSC region number (TYC1), the running number within the region (TYC2) and a component identifier (TYC3) which is normally 1. Some non-GSC running numbers were constructed for the first Tycho Catalogue and for Tycho-2. The recommended star designation contains a hyphen between the TYC numbers, e.g. TYC 1-13-1.
	^(1-8-2) ' ' = normal mean position and proper motion. 'P' = the mean position, proper motion, etc., refer to the photocentre of two Tycho-2 entries, where the BT magnitudes were used in weighting the positions. 'X' = no mean position, no proper motion.
	^(1-8-3) The mean position is a weighted mean for the catalogues contributing to the proper motion determination. This mean has then been brought to epoch 2000.0 by the computed proper motion. See Note(2) above for details. Tycho-2 is one of the several catalogues used to determine the mean position and proper motion. The observed Tycho-2 position is given in the fields RAdeg and DEdeg.
	^(1-8-5) The errors are based on error models.
	^(1-8-4) The mean epochs are given in Julian years.
	^(1-8-6) This goodness of fit is the ratio of the scatter-based and the model-based error. It is only defined when Num > 2. Values exceeding 9.9 are truncated to 9.9.
	^(1-8-7) Blank when no magnitude is available. Either BTmag or VTmag is always given. Approximate Johnson photometry may be obtained as: V = VT -0.090(BT-VT) B-V = 0.850(BT-VT) Consult Sect 1.3 of Vol 1 of "The Hipparcos and Tycho Catalogues", ESA SP-1200, 1997, for details.
	^(1-8-8) Distance in units of 100 mas to the nearest entry in the Tycho-2 main catalogue or supplement. The distance is computed for the epoch 1991.25. A value of 999 (i.e. 99.9 arcsec) is given if the distance exceeds 99.9 arcsec.
	^(1-8-9) ' ' = no Tycho-1 star was found within 0.8 arcsec (quality 1-8) or 2.4 arcsec (quality 9). 'T' = this is a Tycho-1 star. The Tycho-1 identifier is given in the beginning of the record. For Tycho-1 stars, resolved in Tycho-2 as a close pair, both components are flagged as a Tycho-1 star and the Tycho-1 TYC3 is assigned to the brightest (VT) component. The HIP-only stars given in Tycho-1 are not flagged as Tycho-1 stars.
	^(1-8-10) The CCDM component identifiers for double or multiple Hipparcos stars contributing to this Tycho-2 entry. For photocentre solutions, all components within 0.8 arcsec contribute. For double star solutions any unresolved component within 0.8 arcsec contributes. For single star solutions, the predicted signal from close stars were normally subtracted in the analysis of the photon counts and such stars therefore do not contribute to the solution. The components are given in lexical order.
	^(1-8-11) ' ' = normal treatment, close stars were subtracted when possible. 'D' = double star treatment. Two stars were found. The companion is normally included as a separate Tycho-2 entry, but may have been rejected. 'P' = photocentre treatment, close stars were not subtracted. This special treatment was applied to known or suspected doubles which were not successfully (or reliably) resolved in the Tycho-2 double star processing.

1259_tyc2_08.dat - *The Tycho-2 main catalogue
View this Data Download via FTP

Field	Label	Units	Format	Definition
1	TYC1	---	I4	[1,9537]+= TYC1 from TYC or GSC (1)^(1-9-1)
2	TYC2	---	I5	[1,12121] TYC2 from TYC or GSC (1)^(1-9-1)
3	TYC3	---	I2	[1,3] TYC3 from TYC (1)^(1-9-1)
4	pflag	---	A1	[ PX] mean position flag (2)^(1-9-2)
5	RAmdeg	deg	F12.8	[]? Mean Right Asc, ICRS, epoch=J2000 (3)^(1-9-3)
6	DEmdeg	deg	F12.8	[]? Mean Decl, ICRS, at epoch=J2000 (3)^(1-9-3)
7	pmRA	mas/yr	F7.1	[-4418.0,6544.2]? prop. mot. in RA*cos(dec)
8	pmDE	mas/yr	F7.1	[-5774.3,10277.3]? prop. mot. in Dec
9	e_RAmdeg	mas	I3	[3,183]? s.e. RA*cos(dec),at mean epoch (5)^(1-9-5)
10	e_DEmdeg	mas	I3	[1,184]? s.e. of Dec at mean epoch (5)^(1-9-5)
11	e_pmRA	mas/yr	F4.1	[0.2,11.5]? s.e. prop mot in RA*cos(dec)(5)^(1-9-5)
12	e_pmDE	mas/yr	F4.1	[0.2,10.3]? s.e. of proper motion in Dec(5)^(1-9-5)
13	EpRAm	yr	F7.2	[1915.95,1992.53]? mean epoch of RA (4)^(1-9-4)
14	EpDEm	yr	F7.2	[1911.94,1992.01]? mean epoch of Dec (4)^(1-9-4)
15	Num	---	I2	[2,36]? Number of positions used
16	q_RAmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean RA (6)^(1-9-6)
17	q_DEmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean Dec (6)^(1-9-6)
18	q_pmRA	---	F4.1	[0.0,9.9]? Goodness of fit for pmRA (6)^(1-9-6)
19	q_pmDE	---	F4.1	[0.0,9.9]? Goodness of fit for pmDE (6)^(1-9-6)
20	BTmag	mag	F6.3	[2.183,16.581]? Tycho-2 BT magnitude (7)^(1-9-7)
21	e_BTmag	mag	F6.3	[0.014,1.977]? s.e. of BT (7)^(1-9-7)
22	VTmag	mag	F6.3	[1.905,15.193]? Tycho-2 VT magnitude (7)^(1-9-7)
23	e_VTmag	mag	F6.3	[0.009,1.468]? s.e. of VT (7)^(1-9-7)
24	prox	---	I3	[3,999] proximity indicator (8)^(1-9-8)
25	TYC	---	A1	[T] Tycho-1 star (9)^(1-9-9)
26	HIP	---	I6	[1,120404]? Hipparcos number
27	CCDM	---	A3	CCDM component identifier for HIP stars(10)^(1-9-10)
28	RAdeg	deg	F12.8	Observed Tycho-2 Right Ascension, ICRS
29	DEdeg	deg	F12.8	Observed Tycho-2 Declination, ICRS
30	EpRA-1990	yr	F5.2	[0.81,2.13] epoch-1990 of RAdeg
31	EpDE-1990	yr	F5.2	[0.72,2.36] epoch-1990 of DEdeg
32	e_RAdeg	mas	F5.1	s.e.RA*cos(dec), of observed Tycho-2 RA (5)^(1-9-5)
33	e_DEdeg	mas	F5.1	s.e. of observed Tycho-2 Dec (5)^(1-9-5)
34	posflg	---	A1	[ DP] type of Tycho-2 solution (11)^(1-9-11)
35	corr	---	F4.1	[-1,1] correlation (RAdeg,DEdeg)

	^(1-9-1)The TYC identifier is constructed from the GSC region number (TYC1), the running number within the region (TYC2) and a component identifier (TYC3) which is normally 1. Some non-GSC running numbers were constructed for the first Tycho Catalogue and for Tycho-2. The recommended star designation contains a hyphen between the TYC numbers, e.g. TYC 1-13-1.
	^(1-9-2) ' ' = normal mean position and proper motion. 'P' = the mean position, proper motion, etc., refer to the photocentre of two Tycho-2 entries, where the BT magnitudes were used in weighting the positions. 'X' = no mean position, no proper motion.
	^(1-9-3) The mean position is a weighted mean for the catalogues contributing to the proper motion determination. This mean has then been brought to epoch 2000.0 by the computed proper motion. See Note(2) above for details. Tycho-2 is one of the several catalogues used to determine the mean position and proper motion. The observed Tycho-2 position is given in the fields RAdeg and DEdeg.
	^(1-9-5) The errors are based on error models.
	^(1-9-4) The mean epochs are given in Julian years.
	^(1-9-6) This goodness of fit is the ratio of the scatter-based and the model-based error. It is only defined when Num > 2. Values exceeding 9.9 are truncated to 9.9.
	^(1-9-7) Blank when no magnitude is available. Either BTmag or VTmag is always given. Approximate Johnson photometry may be obtained as: V = VT -0.090(BT-VT) B-V = 0.850(BT-VT) Consult Sect 1.3 of Vol 1 of "The Hipparcos and Tycho Catalogues", ESA SP-1200, 1997, for details.
	^(1-9-8) Distance in units of 100 mas to the nearest entry in the Tycho-2 main catalogue or supplement. The distance is computed for the epoch 1991.25. A value of 999 (i.e. 99.9 arcsec) is given if the distance exceeds 99.9 arcsec.
	^(1-9-9) ' ' = no Tycho-1 star was found within 0.8 arcsec (quality 1-8) or 2.4 arcsec (quality 9). 'T' = this is a Tycho-1 star. The Tycho-1 identifier is given in the beginning of the record. For Tycho-1 stars, resolved in Tycho-2 as a close pair, both components are flagged as a Tycho-1 star and the Tycho-1 TYC3 is assigned to the brightest (VT) component. The HIP-only stars given in Tycho-1 are not flagged as Tycho-1 stars.
	^(1-9-10) The CCDM component identifiers for double or multiple Hipparcos stars contributing to this Tycho-2 entry. For photocentre solutions, all components within 0.8 arcsec contribute. For double star solutions any unresolved component within 0.8 arcsec contributes. For single star solutions, the predicted signal from close stars were normally subtracted in the analysis of the photon counts and such stars therefore do not contribute to the solution. The components are given in lexical order.
	^(1-9-11) ' ' = normal treatment, close stars were subtracted when possible. 'D' = double star treatment. Two stars were found. The companion is normally included as a separate Tycho-2 entry, but may have been rejected. 'P' = photocentre treatment, close stars were not subtracted. This special treatment was applied to known or suspected doubles which were not successfully (or reliably) resolved in the Tycho-2 double star processing.

1259_tyc2_09.dat - *The Tycho-2 main catalogue
View this Data Download via FTP

Field	Label	Units	Format	Definition
1	TYC1	---	I4	[1,9537]+= TYC1 from TYC or GSC (1)^(1-10-1)
2	TYC2	---	I5	[1,12121] TYC2 from TYC or GSC (1)^(1-10-1)
3	TYC3	---	I2	[1,3] TYC3 from TYC (1)^(1-10-1)
4	pflag	---	A1	[ PX] mean position flag (2)^(1-10-2)
5	RAmdeg	deg	F12.8	[]? Mean Right Asc, ICRS, epoch=J2000 (3)^(1-10-3)
6	DEmdeg	deg	F12.8	[]? Mean Decl, ICRS, at epoch=J2000 (3)^(1-10-3)
7	pmRA	mas/yr	F7.1	[-4418.0,6544.2]? prop. mot. in RA*cos(dec)
8	pmDE	mas/yr	F7.1	[-5774.3,10277.3]? prop. mot. in Dec
9	e_RAmdeg	mas	I3	[3,183]? s.e. RA*cos(dec),at mean epoch (5)^(1-10-5)
10	e_DEmdeg	mas	I3	[1,184]? s.e. of Dec at mean epoch (5)^(1-10-5)
11	e_pmRA	mas/yr	F4.1	[0.2,11.5]? s.e. prop mot in RA*cos(dec)(5)^(1-10-5)
12	e_pmDE	mas/yr	F4.1	[0.2,10.3]? s.e. of proper motion in Dec(5)^(1-10-5)
13	EpRAm	yr	F7.2	[1915.95,1992.53]? mean epoch of RA (4)^(1-10-4)
14	EpDEm	yr	F7.2	[1911.94,1992.01]? mean epoch of Dec (4)^(1-10-4)
15	Num	---	I2	[2,36]? Number of positions used
16	q_RAmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean RA (6)^(1-10-6)
17	q_DEmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean Dec (6)^(1-10-6)
18	q_pmRA	---	F4.1	[0.0,9.9]? Goodness of fit for pmRA (6)^(1-10-6)
19	q_pmDE	---	F4.1	[0.0,9.9]? Goodness of fit for pmDE (6)^(1-10-6)
20	BTmag	mag	F6.3	[2.183,16.581]? Tycho-2 BT magnitude (7)^(1-10-7)
21	e_BTmag	mag	F6.3	[0.014,1.977]? s.e. of BT (7)^(1-10-7)
22	VTmag	mag	F6.3	[1.905,15.193]? Tycho-2 VT magnitude (7)^(1-10-7)
23	e_VTmag	mag	F6.3	[0.009,1.468]? s.e. of VT (7)^(1-10-7)
24	prox	---	I3	[3,999] proximity indicator (8)^(1-10-8)
25	TYC	---	A1	[T] Tycho-1 star (9)^(1-10-9)
26	HIP	---	I6	[1,120404]? Hipparcos number
27	CCDM	---	A3	CCDM component identifier for HIP stars(10)^(1-10-10)
28	RAdeg	deg	F12.8	Observed Tycho-2 Right Ascension, ICRS
29	DEdeg	deg	F12.8	Observed Tycho-2 Declination, ICRS
30	EpRA-1990	yr	F5.2	[0.81,2.13] epoch-1990 of RAdeg
31	EpDE-1990	yr	F5.2	[0.72,2.36] epoch-1990 of DEdeg
32	e_RAdeg	mas	F5.1	s.e.RA*cos(dec), of observed Tycho-2 RA (5)^(1-10-5)
33	e_DEdeg	mas	F5.1	s.e. of observed Tycho-2 Dec (5)^(1-10-5)
34	posflg	---	A1	[ DP] type of Tycho-2 solution (11)^(1-10-11)
35	corr	---	F4.1	[-1,1] correlation (RAdeg,DEdeg)

	^(1-10-1)The TYC identifier is constructed from the GSC region number (TYC1), the running number within the region (TYC2) and a component identifier (TYC3) which is normally 1. Some non-GSC running numbers were constructed for the first Tycho Catalogue and for Tycho-2. The recommended star designation contains a hyphen between the TYC numbers, e.g. TYC 1-13-1.
	^(1-10-2) ' ' = normal mean position and proper motion. 'P' = the mean position, proper motion, etc., refer to the photocentre of two Tycho-2 entries, where the BT magnitudes were used in weighting the positions. 'X' = no mean position, no proper motion.
	^(1-10-3) The mean position is a weighted mean for the catalogues contributing to the proper motion determination. This mean has then been brought to epoch 2000.0 by the computed proper motion. See Note(2) above for details. Tycho-2 is one of the several catalogues used to determine the mean position and proper motion. The observed Tycho-2 position is given in the fields RAdeg and DEdeg.
	^(1-10-5)The errors are based on error models.
	^(1-10-4)The mean epochs are given in Julian years.
	^(1-10-6) This goodness of fit is the ratio of the scatter-based and the model-based error. It is only defined when Num > 2. Values exceeding 9.9 are truncated to 9.9.
	^(1-10-7) Blank when no magnitude is available. Either BTmag or VTmag is always given. Approximate Johnson photometry may be obtained as: V = VT -0.090(BT-VT) B-V = 0.850(BT-VT) Consult Sect 1.3 of Vol 1 of "The Hipparcos and Tycho Catalogues", ESA SP-1200, 1997, for details.
	^(1-10-8) Distance in units of 100 mas to the nearest entry in the Tycho-2 main catalogue or supplement. The distance is computed for the epoch 1991.25. A value of 999 (i.e. 99.9 arcsec) is given if the distance exceeds 99.9 arcsec.
	^(1-10-9) ' ' = no Tycho-1 star was found within 0.8 arcsec (quality 1-8) or 2.4 arcsec (quality 9). 'T' = this is a Tycho-1 star. The Tycho-1 identifier is given in the beginning of the record. For Tycho-1 stars, resolved in Tycho-2 as a close pair, both components are flagged as a Tycho-1 star and the Tycho-1 TYC3 is assigned to the brightest (VT) component. The HIP-only stars given in Tycho-1 are not flagged as Tycho-1 stars.
	^(1-10-10) The CCDM component identifiers for double or multiple Hipparcos stars contributing to this Tycho-2 entry. For photocentre solutions, all components within 0.8 arcsec contribute. For double star solutions any unresolved component within 0.8 arcsec contributes. For single star solutions, the predicted signal from close stars were normally subtracted in the analysis of the photon counts and such stars therefore do not contribute to the solution. The components are given in lexical order.
	^(1-10-11) ' ' = normal treatment, close stars were subtracted when possible. 'D' = double star treatment. Two stars were found. The companion is normally included as a separate Tycho-2 entry, but may have been rejected. 'P' = photocentre treatment, close stars were not subtracted. This special treatment was applied to known or suspected doubles which were not successfully (or reliably) resolved in the Tycho-2 double star processing.

1259_tyc2_10.dat - *The Tycho-2 main catalogue
View this Data Download via FTP

Field	Label	Units	Format	Definition
1	TYC1	---	I4	[1,9537]+= TYC1 from TYC or GSC (1)^(1-11-1)
2	TYC2	---	I5	[1,12121] TYC2 from TYC or GSC (1)^(1-11-1)
3	TYC3	---	I2	[1,3] TYC3 from TYC (1)^(1-11-1)
4	pflag	---	A1	[ PX] mean position flag (2)^(1-11-2)
5	RAmdeg	deg	F12.8	[]? Mean Right Asc, ICRS, epoch=J2000 (3)^(1-11-3)
6	DEmdeg	deg	F12.8	[]? Mean Decl, ICRS, at epoch=J2000 (3)^(1-11-3)
7	pmRA	mas/yr	F7.1	[-4418.0,6544.2]? prop. mot. in RA*cos(dec)
8	pmDE	mas/yr	F7.1	[-5774.3,10277.3]? prop. mot. in Dec
9	e_RAmdeg	mas	I3	[3,183]? s.e. RA*cos(dec),at mean epoch (5)^(1-11-5)
10	e_DEmdeg	mas	I3	[1,184]? s.e. of Dec at mean epoch (5)^(1-11-5)
11	e_pmRA	mas/yr	F4.1	[0.2,11.5]? s.e. prop mot in RA*cos(dec)(5)^(1-11-5)
12	e_pmDE	mas/yr	F4.1	[0.2,10.3]? s.e. of proper motion in Dec(5)^(1-11-5)
13	EpRAm	yr	F7.2	[1915.95,1992.53]? mean epoch of RA (4)^(1-11-4)
14	EpDEm	yr	F7.2	[1911.94,1992.01]? mean epoch of Dec (4)^(1-11-4)
15	Num	---	I2	[2,36]? Number of positions used
16	q_RAmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean RA (6)^(1-11-6)
17	q_DEmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean Dec (6)^(1-11-6)
18	q_pmRA	---	F4.1	[0.0,9.9]? Goodness of fit for pmRA (6)^(1-11-6)
19	q_pmDE	---	F4.1	[0.0,9.9]? Goodness of fit for pmDE (6)^(1-11-6)
20	BTmag	mag	F6.3	[2.183,16.581]? Tycho-2 BT magnitude (7)^(1-11-7)
21	e_BTmag	mag	F6.3	[0.014,1.977]? s.e. of BT (7)^(1-11-7)
22	VTmag	mag	F6.3	[1.905,15.193]? Tycho-2 VT magnitude (7)^(1-11-7)
23	e_VTmag	mag	F6.3	[0.009,1.468]? s.e. of VT (7)^(1-11-7)
24	prox	---	I3	[3,999] proximity indicator (8)^(1-11-8)
25	TYC	---	A1	[T] Tycho-1 star (9)^(1-11-9)
26	HIP	---	I6	[1,120404]? Hipparcos number
27	CCDM	---	A3	CCDM component identifier for HIP stars(10)^(1-11-10)
28	RAdeg	deg	F12.8	Observed Tycho-2 Right Ascension, ICRS
29	DEdeg	deg	F12.8	Observed Tycho-2 Declination, ICRS
30	EpRA-1990	yr	F5.2	[0.81,2.13] epoch-1990 of RAdeg
31	EpDE-1990	yr	F5.2	[0.72,2.36] epoch-1990 of DEdeg
32	e_RAdeg	mas	F5.1	s.e.RA*cos(dec), of observed Tycho-2 RA (5)^(1-11-5)
33	e_DEdeg	mas	F5.1	s.e. of observed Tycho-2 Dec (5)^(1-11-5)
34	posflg	---	A1	[ DP] type of Tycho-2 solution (11)^(1-11-11)
35	corr	---	F4.1	[-1,1] correlation (RAdeg,DEdeg)

	^(1-11-1)The TYC identifier is constructed from the GSC region number (TYC1), the running number within the region (TYC2) and a component identifier (TYC3) which is normally 1. Some non-GSC running numbers were constructed for the first Tycho Catalogue and for Tycho-2. The recommended star designation contains a hyphen between the TYC numbers, e.g. TYC 1-13-1.
	^(1-11-2) ' ' = normal mean position and proper motion. 'P' = the mean position, proper motion, etc., refer to the photocentre of two Tycho-2 entries, where the BT magnitudes were used in weighting the positions. 'X' = no mean position, no proper motion.
	^(1-11-3) The mean position is a weighted mean for the catalogues contributing to the proper motion determination. This mean has then been brought to epoch 2000.0 by the computed proper motion. See Note(2) above for details. Tycho-2 is one of the several catalogues used to determine the mean position and proper motion. The observed Tycho-2 position is given in the fields RAdeg and DEdeg.
	^(1-11-5) The errors are based on error models.
	^(1-11-4)The mean epochs are given in Julian years.
	^(1-11-6) This goodness of fit is the ratio of the scatter-based and the model-based error. It is only defined when Num > 2. Values exceeding 9.9 are truncated to 9.9.
	^(1-11-7) Blank when no magnitude is available. Either BTmag or VTmag is always given. Approximate Johnson photometry may be obtained as: V = VT -0.090(BT-VT) B-V = 0.850(BT-VT) Consult Sect 1.3 of Vol 1 of "The Hipparcos and Tycho Catalogues", ESA SP-1200, 1997, for details.
	^(1-11-8) Distance in units of 100 mas to the nearest entry in the Tycho-2 main catalogue or supplement. The distance is computed for the epoch 1991.25. A value of 999 (i.e. 99.9 arcsec) is given if the distance exceeds 99.9 arcsec.
	^(1-11-9) ' ' = no Tycho-1 star was found within 0.8 arcsec (quality 1-8) or 2.4 arcsec (quality 9). 'T' = this is a Tycho-1 star. The Tycho-1 identifier is given in the beginning of the record. For Tycho-1 stars, resolved in Tycho-2 as a close pair, both components are flagged as a Tycho-1 star and the Tycho-1 TYC3 is assigned to the brightest (VT) component. The HIP-only stars given in Tycho-1 are not flagged as Tycho-1 stars.
	^(1-11-10) The CCDM component identifiers for double or multiple Hipparcos stars contributing to this Tycho-2 entry. For photocentre solutions, all components within 0.8 arcsec contribute. For double star solutions any unresolved component within 0.8 arcsec contributes. For single star solutions, the predicted signal from close stars were normally subtracted in the analysis of the photon counts and such stars therefore do not contribute to the solution. The components are given in lexical order.
	^(1-11-11) ' ' = normal treatment, close stars were subtracted when possible. 'D' = double star treatment. Two stars were found. The companion is normally included as a separate Tycho-2 entry, but may have been rejected. 'P' = photocentre treatment, close stars were not subtracted. This special treatment was applied to known or suspected doubles which were not successfully (or reliably) resolved in the Tycho-2 double star processing.

1259_tyc2_11.dat - *The Tycho-2 main catalogue
View this Data Download via FTP

Field	Label	Units	Format	Definition
1	TYC1	---	I4	[1,9537]+= TYC1 from TYC or GSC (1)^(1-12-1)
2	TYC2	---	I5	[1,12121] TYC2 from TYC or GSC (1)^(1-12-1)
3	TYC3	---	I2	[1,3] TYC3 from TYC (1)^(1-12-1)
4	pflag	---	A1	[ PX] mean position flag (2)^(1-12-2)
5	RAmdeg	deg	F12.8	[]? Mean Right Asc, ICRS, epoch=J2000 (3)^(1-12-3)
6	DEmdeg	deg	F12.8	[]? Mean Decl, ICRS, at epoch=J2000 (3)^(1-12-3)
7	pmRA	mas/yr	F7.1	[-4418.0,6544.2]? prop. mot. in RA*cos(dec)
8	pmDE	mas/yr	F7.1	[-5774.3,10277.3]? prop. mot. in Dec
9	e_RAmdeg	mas	I3	[3,183]? s.e. RA*cos(dec),at mean epoch (5)^(1-12-5)
10	e_DEmdeg	mas	I3	[1,184]? s.e. of Dec at mean epoch (5)^(1-12-5)
11	e_pmRA	mas/yr	F4.1	[0.2,11.5]? s.e. prop mot in RA*cos(dec)(5)^(1-12-5)
12	e_pmDE	mas/yr	F4.1	[0.2,10.3]? s.e. of proper motion in Dec(5)^(1-12-5)
13	EpRAm	yr	F7.2	[1915.95,1992.53]? mean epoch of RA (4)^(1-12-4)
14	EpDEm	yr	F7.2	[1911.94,1992.01]? mean epoch of Dec (4)^(1-12-4)
15	Num	---	I2	[2,36]? Number of positions used
16	q_RAmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean RA (6)^(1-12-6)
17	q_DEmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean Dec (6)^(1-12-6)
18	q_pmRA	---	F4.1	[0.0,9.9]? Goodness of fit for pmRA (6)^(1-12-6)
19	q_pmDE	---	F4.1	[0.0,9.9]? Goodness of fit for pmDE (6)^(1-12-6)
20	BTmag	mag	F6.3	[2.183,16.581]? Tycho-2 BT magnitude (7)^(1-12-7)
21	e_BTmag	mag	F6.3	[0.014,1.977]? s.e. of BT (7)^(1-12-7)
22	VTmag	mag	F6.3	[1.905,15.193]? Tycho-2 VT magnitude (7)^(1-12-7)
23	e_VTmag	mag	F6.3	[0.009,1.468]? s.e. of VT (7)^(1-12-7)
24	prox	---	I3	[3,999] proximity indicator (8)^(1-12-8)
25	TYC	---	A1	[T] Tycho-1 star (9)^(1-12-9)
26	HIP	---	I6	[1,120404]? Hipparcos number
27	CCDM	---	A3	CCDM component identifier for HIP stars(10)^(1-12-10)
28	RAdeg	deg	F12.8	Observed Tycho-2 Right Ascension, ICRS
29	DEdeg	deg	F12.8	Observed Tycho-2 Declination, ICRS
30	EpRA-1990	yr	F5.2	[0.81,2.13] epoch-1990 of RAdeg
31	EpDE-1990	yr	F5.2	[0.72,2.36] epoch-1990 of DEdeg
32	e_RAdeg	mas	F5.1	s.e.RA*cos(dec), of observed Tycho-2 RA (5)^(1-12-5)
33	e_DEdeg	mas	F5.1	s.e. of observed Tycho-2 Dec (5)^(1-12-5)
34	posflg	---	A1	[ DP] type of Tycho-2 solution (11)^(1-12-11)
35	corr	---	F4.1	[-1,1] correlation (RAdeg,DEdeg)

	^(1-12-1)The TYC identifier is constructed from the GSC region number (TYC1), the running number within the region (TYC2) and a component identifier (TYC3) which is normally 1. Some non-GSC running numbers were constructed for the first Tycho Catalogue and for Tycho-2. The recommended star designation contains a hyphen between the TYC numbers, e.g. TYC 1-13-1.
	^(1-12-2) ' ' = normal mean position and proper motion. 'P' = the mean position, proper motion, etc., refer to the photocentre of two Tycho-2 entries, where the BT magnitudes were used in weighting the positions. 'X' = no mean position, no proper motion.
	^(1-12-3) The mean position is a weighted mean for the catalogues contributing to the proper motion determination. This mean has then been brought to epoch 2000.0 by the computed proper motion. See Note(2) above for details. Tycho-2 is one of the several catalogues used to determine the mean position and proper motion. The observed Tycho-2 position is given in the fields RAdeg and DEdeg.
	^(1-12-5) The errors are based on error models.
	^(1-12-4) The mean epochs are given in Julian years.
	^(1-12-6) This goodness of fit is the ratio of the scatter-based and the model-based error. It is only defined when Num > 2. Values exceeding 9.9 are truncated to 9.9.
	^(1-12-7) Blank when no magnitude is available. Either BTmag or VTmag is always given. Approximate Johnson photometry may be obtained as: V = VT -0.090(BT-VT) B-V = 0.850(BT-VT) Consult Sect 1.3 of Vol 1 of "The Hipparcos and Tycho Catalogues", ESA SP-1200, 1997, for details.
	^(1-12-8) Distance in units of 100 mas to the nearest entry in the Tycho-2 main catalogue or supplement. The distance is computed for the epoch 1991.25. A value of 999 (i.e. 99.9 arcsec) is given if the distance exceeds 99.9 arcsec.
	^(1-12-9) ' ' = no Tycho-1 star was found within 0.8 arcsec (quality 1-8) or 2.4 arcsec (quality 9). 'T' = this is a Tycho-1 star. The Tycho-1 identifier is given in the beginning of the record. For Tycho-1 stars, resolved in Tycho-2 as a close pair, both components are flagged as a Tycho-1 star and the Tycho-1 TYC3 is assigned to the brightest (VT) component. The HIP-only stars given in Tycho-1 are not flagged as Tycho-1 stars.
	^(1-12-10) The CCDM component identifiers for double or multiple Hipparcos stars contributing to this Tycho-2 entry. For photocentre solutions, all components within 0.8 arcsec contribute. For double star solutions any unresolved component within 0.8 arcsec contributes. For single star solutions, the predicted signal from close stars were normally subtracted in the analysis of the photon counts and such stars therefore do not contribute to the solution. The components are given in lexical order.
	^(1-12-11) ' ' = normal treatment, close stars were subtracted when possible. 'D' = double star treatment. Two stars were found. The companion is normally included as a separate Tycho-2 entry, but may have been rejected. 'P' = photocentre treatment, close stars were not subtracted. This special treatment was applied to known or suspected doubles which were not successfully (or reliably) resolved in the Tycho-2 double star processing.

1259_tyc2_12.dat - *The Tycho-2 main catalogue
View this Data Download via FTP

Field	Label	Units	Format	Definition
1	TYC1	---	I4	[1,9537]+= TYC1 from TYC or GSC (1)^(1-13-1)
2	TYC2	---	I5	[1,12121] TYC2 from TYC or GSC (1)^(1-13-1)
3	TYC3	---	I2	[1,3] TYC3 from TYC (1)^(1-13-1)
4	pflag	---	A1	[ PX] mean position flag (2)^(1-13-2)
5	RAmdeg	deg	F12.8	[]? Mean Right Asc, ICRS, epoch=J2000 (3)^(1-13-3)
6	DEmdeg	deg	F12.8	[]? Mean Decl, ICRS, at epoch=J2000 (3)^(1-13-3)
7	pmRA	mas/yr	F7.1	[-4418.0,6544.2]? prop. mot. in RA*cos(dec)
8	pmDE	mas/yr	F7.1	[-5774.3,10277.3]? prop. mot. in Dec
9	e_RAmdeg	mas	I3	[3,183]? s.e. RA*cos(dec),at mean epoch (5)^(1-13-5)
10	e_DEmdeg	mas	I3	[1,184]? s.e. of Dec at mean epoch (5)^(1-13-5)
11	e_pmRA	mas/yr	F4.1	[0.2,11.5]? s.e. prop mot in RA*cos(dec)(5)^(1-13-5)
12	e_pmDE	mas/yr	F4.1	[0.2,10.3]? s.e. of proper motion in Dec(5)^(1-13-5)
13	EpRAm	yr	F7.2	[1915.95,1992.53]? mean epoch of RA (4)^(1-13-4)
14	EpDEm	yr	F7.2	[1911.94,1992.01]? mean epoch of Dec (4)^(1-13-4)
15	Num	---	I2	[2,36]? Number of positions used
16	q_RAmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean RA (6)^(1-13-6)
17	q_DEmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean Dec (6)^(1-13-6)
18	q_pmRA	---	F4.1	[0.0,9.9]? Goodness of fit for pmRA (6)^(1-13-6)
19	q_pmDE	---	F4.1	[0.0,9.9]? Goodness of fit for pmDE (6)^(1-13-6)
20	BTmag	mag	F6.3	[2.183,16.581]? Tycho-2 BT magnitude (7)^(1-13-7)
21	e_BTmag	mag	F6.3	[0.014,1.977]? s.e. of BT (7)^(1-13-7)
22	VTmag	mag	F6.3	[1.905,15.193]? Tycho-2 VT magnitude (7)^(1-13-7)
23	e_VTmag	mag	F6.3	[0.009,1.468]? s.e. of VT (7)^(1-13-7)
24	prox	---	I3	[3,999] proximity indicator (8)^(1-13-8)
25	TYC	---	A1	[T] Tycho-1 star (9)^(1-13-9)
26	HIP	---	I6	[1,120404]? Hipparcos number
27	CCDM	---	A3	CCDM component identifier for HIP stars(10)^(1-13-10)
28	RAdeg	deg	F12.8	Observed Tycho-2 Right Ascension, ICRS
29	DEdeg	deg	F12.8	Observed Tycho-2 Declination, ICRS
30	EpRA-1990	yr	F5.2	[0.81,2.13] epoch-1990 of RAdeg
31	EpDE-1990	yr	F5.2	[0.72,2.36] epoch-1990 of DEdeg
32	e_RAdeg	mas	F5.1	s.e.RA*cos(dec), of observed Tycho-2 RA (5)^(1-13-5)
33	e_DEdeg	mas	F5.1	s.e. of observed Tycho-2 Dec (5)^(1-13-5)
34	posflg	---	A1	[ DP] type of Tycho-2 solution (11)^(1-13-11)
35	corr	---	F4.1	[-1,1] correlation (RAdeg,DEdeg)

	^(1-13-1)The TYC identifier is constructed from the GSC region number (TYC1), the running number within the region (TYC2) and a component identifier (TYC3) which is normally 1. Some non-GSC running numbers were constructed for the first Tycho Catalogue and for Tycho-2. The recommended star designation contains a hyphen between the TYC numbers, e.g. TYC 1-13-1.
	^(1-13-2) ' ' = normal mean position and proper motion. 'P' = the mean position, proper motion, etc., refer to the photocentre of two Tycho-2 entries, where the BT magnitudes were used in weighting the positions. 'X' = no mean position, no proper motion.
	^(1-13-3) The mean position is a weighted mean for the catalogues contributing to the proper motion determination. This mean has then been brought to epoch 2000.0 by the computed proper motion. See Note(2) above for details. Tycho-2 is one of the several catalogues used to determine the mean position and proper motion. The observed Tycho-2 position is given in the fields RAdeg and DEdeg.
	^(1-13-5) The errors are based on error models.
	^(1-13-4) The mean epochs are given in Julian years.
	^(1-13-6) This goodness of fit is the ratio of the scatter-based and the model-based error. It is only defined when Num > 2. Values exceeding 9.9 are truncated to 9.9.
	^(1-13-7) Blank when no magnitude is available. Either BTmag or VTmag is always given. Approximate Johnson photometry may be obtained as: V = VT -0.090(BT-VT) B-V = 0.850(BT-VT) Consult Sect 1.3 of Vol 1 of "The Hipparcos and Tycho Catalogues", ESA SP-1200, 1997, for details.
	^(1-13-8) Distance in units of 100 mas to the nearest entry in the Tycho-2 main catalogue or supplement. The distance is computed for the epoch 1991.25. A value of 999 (i.e. 99.9 arcsec) is given if the distance exceeds 99.9 arcsec.
	^(1-13-9) ' ' = no Tycho-1 star was found within 0.8 arcsec (quality 1-8) or 2.4 arcsec (quality 9). 'T' = this is a Tycho-1 star. The Tycho-1 identifier is given in the beginning of the record. For Tycho-1 stars, resolved in Tycho-2 as a close pair, both components are flagged as a Tycho-1 star and the Tycho-1 TYC3 is assigned to the brightest (VT) component. The HIP-only stars given in Tycho-1 are not flagged as Tycho-1 stars.
	^(1-13-10) The CCDM component identifiers for double or multiple Hipparcos stars contributing to this Tycho-2 entry. For photocentre solutions, all components within 0.8 arcsec contribute. For double star solutions any unresolved component within 0.8 arcsec contributes. For single star solutions, the predicted signal from close stars were normally subtracted in the analysis of the photon counts and such stars therefore do not contribute to the solution. The components are given in lexical order.
	^(1-13-11) ' ' = normal treatment, close stars were subtracted when possible. 'D' = double star treatment. Two stars were found. The companion is normally included as a separate Tycho-2 entry, but may have been rejected. 'P' = photocentre treatment, close stars were not subtracted. This special treatment was applied to known or suspected doubles which were not successfully (or reliably) resolved in the Tycho-2 double star processing.

1259_tyc2_13.dat - *The Tycho-2 main catalogue
View this Data Download via FTP

Field	Label	Units	Format	Definition
1	TYC1	---	I4	[1,9537]+= TYC1 from TYC or GSC (1)^(1-14-1)
2	TYC2	---	I5	[1,12121] TYC2 from TYC or GSC (1)^(1-14-1)
3	TYC3	---	I2	[1,3] TYC3 from TYC (1)^(1-14-1)
4	pflag	---	A1	[ PX] mean position flag (2)^(1-14-2)
5	RAmdeg	deg	F12.8	[]? Mean Right Asc, ICRS, epoch=J2000 (3)^(1-14-3)
6	DEmdeg	deg	F12.8	[]? Mean Decl, ICRS, at epoch=J2000 (3)^(1-14-3)
7	pmRA	mas/yr	F7.1	[-4418.0,6544.2]? prop. mot. in RA*cos(dec)
8	pmDE	mas/yr	F7.1	[-5774.3,10277.3]? prop. mot. in Dec
9	e_RAmdeg	mas	I3	[3,183]? s.e. RA*cos(dec),at mean epoch (5)^(1-14-5)
10	e_DEmdeg	mas	I3	[1,184]? s.e. of Dec at mean epoch (5)^(1-14-5)
11	e_pmRA	mas/yr	F4.1	[0.2,11.5]? s.e. prop mot in RA*cos(dec)(5)^(1-14-5)
12	e_pmDE	mas/yr	F4.1	[0.2,10.3]? s.e. of proper motion in Dec(5)^(1-14-5)
13	EpRAm	yr	F7.2	[1915.95,1992.53]? mean epoch of RA (4)^(1-14-4)
14	EpDEm	yr	F7.2	[1911.94,1992.01]? mean epoch of Dec (4)^(1-14-4)
15	Num	---	I2	[2,36]? Number of positions used
16	q_RAmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean RA (6)^(1-14-6)
17	q_DEmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean Dec (6)^(1-14-6)
18	q_pmRA	---	F4.1	[0.0,9.9]? Goodness of fit for pmRA (6)^(1-14-6)
19	q_pmDE	---	F4.1	[0.0,9.9]? Goodness of fit for pmDE (6)^(1-14-6)
20	BTmag	mag	F6.3	[2.183,16.581]? Tycho-2 BT magnitude (7)^(1-14-7)
21	e_BTmag	mag	F6.3	[0.014,1.977]? s.e. of BT (7)^(1-14-7)
22	VTmag	mag	F6.3	[1.905,15.193]? Tycho-2 VT magnitude (7)^(1-14-7)
23	e_VTmag	mag	F6.3	[0.009,1.468]? s.e. of VT (7)^(1-14-7)
24	prox	---	I3	[3,999] proximity indicator (8)^(1-14-8)
25	TYC	---	A1	[T] Tycho-1 star (9)^(1-14-9)
26	HIP	---	I6	[1,120404]? Hipparcos number
27	CCDM	---	A3	CCDM component identifier for HIP stars(10)^(1-14-10)
28	RAdeg	deg	F12.8	Observed Tycho-2 Right Ascension, ICRS
29	DEdeg	deg	F12.8	Observed Tycho-2 Declination, ICRS
30	EpRA-1990	yr	F5.2	[0.81,2.13] epoch-1990 of RAdeg
31	EpDE-1990	yr	F5.2	[0.72,2.36] epoch-1990 of DEdeg
32	e_RAdeg	mas	F5.1	s.e.RA*cos(dec), of observed Tycho-2 RA (5)^(1-14-5)
33	e_DEdeg	mas	F5.1	s.e. of observed Tycho-2 Dec (5)^(1-14-5)
34	posflg	---	A1	[ DP] type of Tycho-2 solution (11)^(1-14-11)
35	corr	---	F4.1	[-1,1] correlation (RAdeg,DEdeg)

	^(1-14-1)The TYC identifier is constructed from the GSC region number (TYC1), the running number within the region (TYC2) and a component identifier (TYC3) which is normally 1. Some non-GSC running numbers were constructed for the first Tycho Catalogue and for Tycho-2. The recommended star designation contains a hyphen between the TYC numbers, e.g. TYC 1-13-1.
	^(1-14-2) ' ' = normal mean position and proper motion. 'P' = the mean position, proper motion, etc., refer to the photocentre of two Tycho-2 entries, where the BT magnitudes were used in weighting the positions. 'X' = no mean position, no proper motion.
	^(1-14-3) The mean position is a weighted mean for the catalogues contributing to the proper motion determination. This mean has then been brought to epoch 2000.0 by the computed proper motion. See Note(2) above for details. Tycho-2 is one of the several catalogues used to determine the mean position and proper motion. The observed Tycho-2 position is given in the fields RAdeg and DEdeg.
	^(1-14-5) The errors are based on error models.
	^(1-14-4) The mean epochs are given in Julian years.
	^(1-14-6) This goodness of fit is the ratio of the scatter-based and the model-based error. It is only defined when Num > 2. Values exceeding 9.9 are truncated to 9.9.
	^(1-14-7) Blank when no magnitude is available. Either BTmag or VTmag is always given. Approximate Johnson photometry may be obtained as: V = VT -0.090(BT-VT) B-V = 0.850(BT-VT) Consult Sect 1.3 of Vol 1 of "The Hipparcos and Tycho Catalogues", ESA SP-1200, 1997, for details.
	^(1-14-8) Distance in units of 100 mas to the nearest entry in the Tycho-2 main catalogue or supplement. The distance is computed for the epoch 1991.25. A value of 999 (i.e. 99.9 arcsec) is given if the distance exceeds 99.9 arcsec.
	^(1-14-9) ' ' = no Tycho-1 star was found within 0.8 arcsec (quality 1-8) or 2.4 arcsec (quality 9). 'T' = this is a Tycho-1 star. The Tycho-1 identifier is given in the beginning of the record. For Tycho-1 stars, resolved in Tycho-2 as a close pair, both components are flagged as a Tycho-1 star and the Tycho-1 TYC3 is assigned to the brightest (VT) component. The HIP-only stars given in Tycho-1 are not flagged as Tycho-1 stars.
	^(1-14-10) The CCDM component identifiers for double or multiple Hipparcos stars contributing to this Tycho-2 entry. For photocentre solutions, all components within 0.8 arcsec contribute. For double star solutions any unresolved component within 0.8 arcsec contributes. For single star solutions, the predicted signal from close stars were normally subtracted in the analysis of the photon counts and such stars therefore do not contribute to the solution. The components are given in lexical order.
	^(1-14-11) ' ' = normal treatment, close stars were subtracted when possible. 'D' = double star treatment. Two stars were found. The companion is normally included as a separate Tycho-2 entry, but may have been rejected. 'P' = photocentre treatment, close stars were not subtracted. This special treatment was applied to known or suspected doubles which were not successfully (or reliably) resolved in the Tycho-2 double star processing.

1259_tyc2_14.dat - *The Tycho-2 main catalogue
View this Data Download via FTP

Field	Label	Units	Format	Definition
1	TYC1	---	I4	[1,9537]+= TYC1 from TYC or GSC (1)^(1-15-1)
2	TYC2	---	I5	[1,12121] TYC2 from TYC or GSC (1)^(1-15-1)
3	TYC3	---	I2	[1,3] TYC3 from TYC (1)^(1-15-1)
4	pflag	---	A1	[ PX] mean position flag (2)^(1-15-2)
5	RAmdeg	deg	F12.8	[]? Mean Right Asc, ICRS, epoch=J2000 (3)^(1-15-3)
6	DEmdeg	deg	F12.8	[]? Mean Decl, ICRS, at epoch=J2000 (3)^(1-15-3)
7	pmRA	mas/yr	F7.1	[-4418.0,6544.2]? prop. mot. in RA*cos(dec)
8	pmDE	mas/yr	F7.1	[-5774.3,10277.3]? prop. mot. in Dec
9	e_RAmdeg	mas	I3	[3,183]? s.e. RA*cos(dec),at mean epoch (5)^(1-15-5)
10	e_DEmdeg	mas	I3	[1,184]? s.e. of Dec at mean epoch (5)^(1-15-5)
11	e_pmRA	mas/yr	F4.1	[0.2,11.5]? s.e. prop mot in RA*cos(dec)(5)^(1-15-5)
12	e_pmDE	mas/yr	F4.1	[0.2,10.3]? s.e. of proper motion in Dec(5)^(1-15-5)
13	EpRAm	yr	F7.2	[1915.95,1992.53]? mean epoch of RA (4)^(1-15-4)
14	EpDEm	yr	F7.2	[1911.94,1992.01]? mean epoch of Dec (4)^(1-15-4)
15	Num	---	I2	[2,36]? Number of positions used
16	q_RAmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean RA (6)^(1-15-6)
17	q_DEmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean Dec (6)^(1-15-6)
18	q_pmRA	---	F4.1	[0.0,9.9]? Goodness of fit for pmRA (6)^(1-15-6)
19	q_pmDE	---	F4.1	[0.0,9.9]? Goodness of fit for pmDE (6)^(1-15-6)
20	BTmag	mag	F6.3	[2.183,16.581]? Tycho-2 BT magnitude (7)^(1-15-7)
21	e_BTmag	mag	F6.3	[0.014,1.977]? s.e. of BT (7)^(1-15-7)
22	VTmag	mag	F6.3	[1.905,15.193]? Tycho-2 VT magnitude (7)^(1-15-7)
23	e_VTmag	mag	F6.3	[0.009,1.468]? s.e. of VT (7)^(1-15-7)
24	prox	---	I3	[3,999] proximity indicator (8)^(1-15-8)
25	TYC	---	A1	[T] Tycho-1 star (9)^(1-15-9)
26	HIP	---	I6	[1,120404]? Hipparcos number
27	CCDM	---	A3	CCDM component identifier for HIP stars(10)^(1-15-10)
28	RAdeg	deg	F12.8	Observed Tycho-2 Right Ascension, ICRS
29	DEdeg	deg	F12.8	Observed Tycho-2 Declination, ICRS
30	EpRA-1990	yr	F5.2	[0.81,2.13] epoch-1990 of RAdeg
31	EpDE-1990	yr	F5.2	[0.72,2.36] epoch-1990 of DEdeg
32	e_RAdeg	mas	F5.1	s.e.RA*cos(dec), of observed Tycho-2 RA (5)^(1-15-5)
33	e_DEdeg	mas	F5.1	s.e. of observed Tycho-2 Dec (5)^(1-15-5)
34	posflg	---	A1	[ DP] type of Tycho-2 solution (11)^(1-15-11)
35	corr	---	F4.1	[-1,1] correlation (RAdeg,DEdeg)

	^(1-15-1)The TYC identifier is constructed from the GSC region number (TYC1), the running number within the region (TYC2) and a component identifier (TYC3) which is normally 1. Some non-GSC running numbers were constructed for the first Tycho Catalogue and for Tycho-2. The recommended star designation contains a hyphen between the TYC numbers, e.g. TYC 1-13-1.
	^(1-15-2) ' ' = normal mean position and proper motion. 'P' = the mean position, proper motion, etc., refer to the photocentre of two Tycho-2 entries, where the BT magnitudes were used in weighting the positions. 'X' = no mean position, no proper motion.
	^(1-15-3) The mean position is a weighted mean for the catalogues contributing to the proper motion determination. This mean has then been brought to epoch 2000.0 by the computed proper motion. See Note(2) above for details. Tycho-2 is one of the several catalogues used to determine the mean position and proper motion. The observed Tycho-2 position is given in the fields RAdeg and DEdeg.
	^(1-15-5) The errors are based on error models.
	^(1-15-4) The mean epochs are given in Julian years.
	^(1-15-6) This goodness of fit is the ratio of the scatter-based and the model-based error. It is only defined when Num > 2. Values exceeding 9.9 are truncated to 9.9.
	^(1-15-7) Blank when no magnitude is available. Either BTmag or VTmag is always given. Approximate Johnson photometry may be obtained as: V = VT -0.090(BT-VT) B-V = 0.850(BT-VT) Consult Sect 1.3 of Vol 1 of "The Hipparcos and Tycho Catalogues", ESA SP-1200, 1997, for details.
	^(1-15-8) Distance in units of 100 mas to the nearest entry in the Tycho-2 main catalogue or supplement. The distance is computed for the epoch 1991.25. A value of 999 (i.e. 99.9 arcsec) is given if the distance exceeds 99.9 arcsec.
	^(1-15-9) ' ' = no Tycho-1 star was found within 0.8 arcsec (quality 1-8) or 2.4 arcsec (quality 9). 'T' = this is a Tycho-1 star. The Tycho-1 identifier is given in the beginning of the record. For Tycho-1 stars, resolved in Tycho-2 as a close pair, both components are flagged as a Tycho-1 star and the Tycho-1 TYC3 is assigned to the brightest (VT) component. The HIP-only stars given in Tycho-1 are not flagged as Tycho-1 stars.
	^(1-15-10) The CCDM component identifiers for double or multiple Hipparcos stars contributing to this Tycho-2 entry. For photocentre solutions, all components within 0.8 arcsec contribute. For double star solutions any unresolved component within 0.8 arcsec contributes. For single star solutions, the predicted signal from close stars were normally subtracted in the analysis of the photon counts and such stars therefore do not contribute to the solution. The components are given in lexical order.
	^(1-15-11) ' ' = normal treatment, close stars were subtracted when possible. 'D' = double star treatment. Two stars were found. The companion is normally included as a separate Tycho-2 entry, but may have been rejected. 'P' = photocentre treatment, close stars were not subtracted. This special treatment was applied to known or suspected doubles which were not successfully (or reliably) resolved in the Tycho-2 double star processing.

1259_tyc2_15.dat - *The Tycho-2 main catalogue
View this Data Download via FTP

Field	Label	Units	Format	Definition
1	TYC1	---	I4	[1,9537]+= TYC1 from TYC or GSC (1)^(1-16-1)
2	TYC2	---	I5	[1,12121] TYC2 from TYC or GSC (1)^(1-16-1)
3	TYC3	---	I2	[1,3] TYC3 from TYC (1)^(1-16-1)
4	pflag	---	A1	[ PX] mean position flag (2)^(1-16-2)
5	RAmdeg	deg	F12.8	[]? Mean Right Asc, ICRS, epoch=J2000 (3)^(1-16-3)
6	DEmdeg	deg	F12.8	[]? Mean Decl, ICRS, at epoch=J2000 (3)^(1-16-3)
7	pmRA	mas/yr	F7.1	[-4418.0,6544.2]? prop. mot. in RA*cos(dec)
8	pmDE	mas/yr	F7.1	[-5774.3,10277.3]? prop. mot. in Dec
9	e_RAmdeg	mas	I3	[3,183]? s.e. RA*cos(dec),at mean epoch (5)^(1-16-5)
10	e_DEmdeg	mas	I3	[1,184]? s.e. of Dec at mean epoch (5)^(1-16-5)
11	e_pmRA	mas/yr	F4.1	[0.2,11.5]? s.e. prop mot in RA*cos(dec)(5)^(1-16-5)
12	e_pmDE	mas/yr	F4.1	[0.2,10.3]? s.e. of proper motion in Dec(5)^(1-16-5)
13	EpRAm	yr	F7.2	[1915.95,1992.53]? mean epoch of RA (4)^(1-16-4)
14	EpDEm	yr	F7.2	[1911.94,1992.01]? mean epoch of Dec (4)^(1-16-4)
15	Num	---	I2	[2,36]? Number of positions used
16	q_RAmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean RA (6)^(1-16-6)
17	q_DEmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean Dec (6)^(1-16-6)
18	q_pmRA	---	F4.1	[0.0,9.9]? Goodness of fit for pmRA (6)^(1-16-6)
19	q_pmDE	---	F4.1	[0.0,9.9]? Goodness of fit for pmDE (6)^(1-16-6)
20	BTmag	mag	F6.3	[2.183,16.581]? Tycho-2 BT magnitude (7)^(1-16-7)
21	e_BTmag	mag	F6.3	[0.014,1.977]? s.e. of BT (7)^(1-16-7)
22	VTmag	mag	F6.3	[1.905,15.193]? Tycho-2 VT magnitude (7)^(1-16-7)
23	e_VTmag	mag	F6.3	[0.009,1.468]? s.e. of VT (7)^(1-16-7)
24	prox	---	I3	[3,999] proximity indicator (8)^(1-16-8)
25	TYC	---	A1	[T] Tycho-1 star (9)^(1-16-9)
26	HIP	---	I6	[1,120404]? Hipparcos number
27	CCDM	---	A3	CCDM component identifier for HIP stars(10)^(1-16-10)
28	RAdeg	deg	F12.8	Observed Tycho-2 Right Ascension, ICRS
29	DEdeg	deg	F12.8	Observed Tycho-2 Declination, ICRS
30	EpRA-1990	yr	F5.2	[0.81,2.13] epoch-1990 of RAdeg
31	EpDE-1990	yr	F5.2	[0.72,2.36] epoch-1990 of DEdeg
32	e_RAdeg	mas	F5.1	s.e.RA*cos(dec), of observed Tycho-2 RA (5)^(1-16-5)
33	e_DEdeg	mas	F5.1	s.e. of observed Tycho-2 Dec (5)^(1-16-5)
34	posflg	---	A1	[ DP] type of Tycho-2 solution (11)^(1-16-11)
35	corr	---	F4.1	[-1,1] correlation (RAdeg,DEdeg)

	^(1-16-1)The TYC identifier is constructed from the GSC region number (TYC1), the running number within the region (TYC2) and a component identifier (TYC3) which is normally 1. Some non-GSC running numbers were constructed for the first Tycho Catalogue and for Tycho-2. The recommended star designation contains a hyphen between the TYC numbers, e.g. TYC 1-13-1.
	^(1-16-2) ' ' = normal mean position and proper motion. 'P' = the mean position, proper motion, etc., refer to the photocentre of two Tycho-2 entries, where the BT magnitudes were used in weighting the positions. 'X' = no mean position, no proper motion.
	^(1-16-3) The mean position is a weighted mean for the catalogues contributing to the proper motion determination. This mean has then been brought to epoch 2000.0 by the computed proper motion. See Note(2) above for details. Tycho-2 is one of the several catalogues used to determine the mean position and proper motion. The observed Tycho-2 position is given in the fields RAdeg and DEdeg.
	^(1-16-5) The errors are based on error models.
	^(1-16-4) The mean epochs are given in Julian years.
	^(1-16-6) This goodness of fit is the ratio of the scatter-based and the model-based error. It is only defined when Num > 2. Values exceeding 9.9 are truncated to 9.9.
	^(1-16-7) Blank when no magnitude is available. Either BTmag or VTmag is always given. Approximate Johnson photometry may be obtained as: V = VT -0.090(BT-VT) B-V = 0.850(BT-VT) Consult Sect 1.3 of Vol 1 of "The Hipparcos and Tycho Catalogues", ESA SP-1200, 1997, for details.
	^(1-16-8) Distance in units of 100 mas to the nearest entry in the Tycho-2 main catalogue or supplement. The distance is computed for the epoch 1991.25. A value of 999 (i.e. 99.9 arcsec) is given if the distance exceeds 99.9 arcsec.
	^(1-16-9) ' ' = no Tycho-1 star was found within 0.8 arcsec (quality 1-8) or 2.4 arcsec (quality 9). 'T' = this is a Tycho-1 star. The Tycho-1 identifier is given in the beginning of the record. For Tycho-1 stars, resolved in Tycho-2 as a close pair, both components are flagged as a Tycho-1 star and the Tycho-1 TYC3 is assigned to the brightest (VT) component. The HIP-only stars given in Tycho-1 are not flagged as Tycho-1 stars.
	^(1-16-10) The CCDM component identifiers for double or multiple Hipparcos stars contributing to this Tycho-2 entry. For photocentre solutions, all components within 0.8 arcsec contribute. For double star solutions any unresolved component within 0.8 arcsec contributes. For single star solutions, the predicted signal from close stars were normally subtracted in the analysis of the photon counts and such stars therefore do not contribute to the solution. The components are given in lexical order.
	^(1-16-11) ' ' = normal treatment, close stars were subtracted when possible. 'D' = double star treatment. Two stars were found. The companion is normally included as a separate Tycho-2 entry, but may have been rejected. 'P' = photocentre treatment, close stars were not subtracted. This special treatment was applied to known or suspected doubles which were not successfully (or reliably) resolved in the Tycho-2 double star processing.

1259_tyc2_16.dat - *The Tycho-2 main catalogue
View this Data Download via FTP

Field	Label	Units	Format	Definition
1	TYC1	---	I4	[1,9537]+= TYC1 from TYC or GSC (1)^(1-17-1)
2	TYC2	---	I5	[1,12121] TYC2 from TYC or GSC (1)^(1-17-1)
3	TYC3	---	I2	[1,3] TYC3 from TYC (1)^(1-17-1)
4	pflag	---	A1	[ PX] mean position flag (2)^(1-17-2)
5	RAmdeg	deg	F12.8	[]? Mean Right Asc, ICRS, epoch=J2000 (3)^(1-17-3)
6	DEmdeg	deg	F12.8	[]? Mean Decl, ICRS, at epoch=J2000 (3)^(1-17-3)
7	pmRA	mas/yr	F7.1	[-4418.0,6544.2]? prop. mot. in RA*cos(dec)
8	pmDE	mas/yr	F7.1	[-5774.3,10277.3]? prop. mot. in Dec
9	e_RAmdeg	mas	I3	[3,183]? s.e. RA*cos(dec),at mean epoch (5)^(1-17-5)
10	e_DEmdeg	mas	I3	[1,184]? s.e. of Dec at mean epoch (5)^(1-17-5)
11	e_pmRA	mas/yr	F4.1	[0.2,11.5]? s.e. prop mot in RA*cos(dec)(5)^(1-17-5)
12	e_pmDE	mas/yr	F4.1	[0.2,10.3]? s.e. of proper motion in Dec(5)^(1-17-5)
13	EpRAm	yr	F7.2	[1915.95,1992.53]? mean epoch of RA (4)^(1-17-4)
14	EpDEm	yr	F7.2	[1911.94,1992.01]? mean epoch of Dec (4)^(1-17-4)
15	Num	---	I2	[2,36]? Number of positions used
16	q_RAmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean RA (6)^(1-17-6)
17	q_DEmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean Dec (6)^(1-17-6)
18	q_pmRA	---	F4.1	[0.0,9.9]? Goodness of fit for pmRA (6)^(1-17-6)
19	q_pmDE	---	F4.1	[0.0,9.9]? Goodness of fit for pmDE (6)^(1-17-6)
20	BTmag	mag	F6.3	[2.183,16.581]? Tycho-2 BT magnitude (7)^(1-17-7)
21	e_BTmag	mag	F6.3	[0.014,1.977]? s.e. of BT (7)^(1-17-7)
22	VTmag	mag	F6.3	[1.905,15.193]? Tycho-2 VT magnitude (7)^(1-17-7)
23	e_VTmag	mag	F6.3	[0.009,1.468]? s.e. of VT (7)^(1-17-7)
24	prox	---	I3	[3,999] proximity indicator (8)^(1-17-8)
25	TYC	---	A1	[T] Tycho-1 star (9)^(1-17-9)
26	HIP	---	I6	[1,120404]? Hipparcos number
27	CCDM	---	A3	CCDM component identifier for HIP stars(10)^(1-17-10)
28	RAdeg	deg	F12.8	Observed Tycho-2 Right Ascension, ICRS
29	DEdeg	deg	F12.8	Observed Tycho-2 Declination, ICRS
30	EpRA-1990	yr	F5.2	[0.81,2.13] epoch-1990 of RAdeg
31	EpDE-1990	yr	F5.2	[0.72,2.36] epoch-1990 of DEdeg
32	e_RAdeg	mas	F5.1	s.e.RA*cos(dec), of observed Tycho-2 RA (5)^(1-17-5)
33	e_DEdeg	mas	F5.1	s.e. of observed Tycho-2 Dec (5)^(1-17-5)
34	posflg	---	A1	[ DP] type of Tycho-2 solution (11)^(1-17-11)
35	corr	---	F4.1	[-1,1] correlation (RAdeg,DEdeg)

	^(1-17-1)The TYC identifier is constructed from the GSC region number (TYC1), the running number within the region (TYC2) and a component identifier (TYC3) which is normally 1. Some non-GSC running numbers were constructed for the first Tycho Catalogue and for Tycho-2. The recommended star designation contains a hyphen between the TYC numbers, e.g. TYC 1-13-1.
	^(1-17-2) ' ' = normal mean position and proper motion. 'P' = the mean position, proper motion, etc., refer to the photocentre of two Tycho-2 entries, where the BT magnitudes were used in weighting the positions. 'X' = no mean position, no proper motion.
	^(1-17-3) The mean position is a weighted mean for the catalogues contributing to the proper motion determination. This mean has then been brought to epoch 2000.0 by the computed proper motion. See Note(2) above for details. Tycho-2 is one of the several catalogues used to determine the mean position and proper motion. The observed Tycho-2 position is given in the fields RAdeg and DEdeg.
	^(1-17-5) The errors are based on error models.
	^(1-17-4) The mean epochs are given in Julian years.
	^(1-17-6) This goodness of fit is the ratio of the scatter-based and the model-based error. It is only defined when Num > 2. Values exceeding 9.9 are truncated to 9.9.
	^(1-17-7) Blank when no magnitude is available. Either BTmag or VTmag is always given. Approximate Johnson photometry may be obtained as: V = VT -0.090(BT-VT) B-V = 0.850(BT-VT) Consult Sect 1.3 of Vol 1 of "The Hipparcos and Tycho Catalogues", ESA SP-1200, 1997, for details.
	^(1-17-8) Distance in units of 100 mas to the nearest entry in the Tycho-2 main catalogue or supplement. The distance is computed for the epoch 1991.25. A value of 999 (i.e. 99.9 arcsec) is given if the distance exceeds 99.9 arcsec.
	^(1-17-9) ' ' = no Tycho-1 star was found within 0.8 arcsec (quality 1-8) or 2.4 arcsec (quality 9). 'T' = this is a Tycho-1 star. The Tycho-1 identifier is given in the beginning of the record. For Tycho-1 stars, resolved in Tycho-2 as a close pair, both components are flagged as a Tycho-1 star and the Tycho-1 TYC3 is assigned to the brightest (VT) component. The HIP-only stars given in Tycho-1 are not flagged as Tycho-1 stars.
	^(1-17-10) The CCDM component identifiers for double or multiple Hipparcos stars contributing to this Tycho-2 entry. For photocentre solutions, all components within 0.8 arcsec contribute. For double star solutions any unresolved component within 0.8 arcsec contributes. For single star solutions, the predicted signal from close stars were normally subtracted in the analysis of the photon counts and such stars therefore do not contribute to the solution. The components are given in lexical order.
	^(1-17-11) ' ' = normal treatment, close stars were subtracted when possible. 'D' = double star treatment. Two stars were found. The companion is normally included as a separate Tycho-2 entry, but may have been rejected. 'P' = photocentre treatment, close stars were not subtracted. This special treatment was applied to known or suspected doubles which were not successfully (or reliably) resolved in the Tycho-2 double star processing.

1259_tyc2_17.dat - *The Tycho-2 main catalogue
View this Data Download via FTP

Field	Label	Units	Format	Definition
1	TYC1	---	I4	[1,9537]+= TYC1 from TYC or GSC (1)^(1-18-1)
2	TYC2	---	I5	[1,12121] TYC2 from TYC or GSC (1)^(1-18-1)
3	TYC3	---	I2	[1,3] TYC3 from TYC (1)^(1-18-1)
4	pflag	---	A1	[ PX] mean position flag (2)^(1-18-2)
5	RAmdeg	deg	F12.8	[]? Mean Right Asc, ICRS, epoch=J2000 (3)^(1-18-3)
6	DEmdeg	deg	F12.8	[]? Mean Decl, ICRS, at epoch=J2000 (3)^(1-18-3)
7	pmRA	mas/yr	F7.1	[-4418.0,6544.2]? prop. mot. in RA*cos(dec)
8	pmDE	mas/yr	F7.1	[-5774.3,10277.3]? prop. mot. in Dec
9	e_RAmdeg	mas	I3	[3,183]? s.e. RA*cos(dec),at mean epoch (5)^(1-18-5)
10	e_DEmdeg	mas	I3	[1,184]? s.e. of Dec at mean epoch (5)^(1-18-5)
11	e_pmRA	mas/yr	F4.1	[0.2,11.5]? s.e. prop mot in RA*cos(dec)(5)^(1-18-5)
12	e_pmDE	mas/yr	F4.1	[0.2,10.3]? s.e. of proper motion in Dec(5)^(1-18-5)
13	EpRAm	yr	F7.2	[1915.95,1992.53]? mean epoch of RA (4)^(1-18-4)
14	EpDEm	yr	F7.2	[1911.94,1992.01]? mean epoch of Dec (4)^(1-18-4)
15	Num	---	I2	[2,36]? Number of positions used
16	q_RAmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean RA (6)^(1-18-6)
17	q_DEmdeg	---	F4.1	[0.0,9.9]? Goodness of fit for mean Dec (6)^(1-18-6)
18	q_pmRA	---	F4.1	[0.0,9.9]? Goodness of fit for pmRA (6)^(1-18-6)
19	q_pmDE	---	F4.1	[0.0,9.9]? Goodness of fit for pmDE (6)^(1-18-6)
20	BTmag	mag	F6.3	[2.183,16.581]? Tycho-2 BT magnitude (7)^(1-18-7)
21	e_BTmag	mag	F6.3	[0.014,1.977]? s.e. of BT (7)^(1-18-7)
22	VTmag	mag	F6.3	[1.905,15.193]? Tycho-2 VT magnitude (7)^(1-18-7)
23	e_VTmag	mag	F6.3	[0.009,1.468]? s.e. of VT (7)^(1-18-7)
24	prox	---	I3	[3,999] proximity indicator (8)^(1-18-8)
25	TYC	---	A1	[T] Tycho-1 star (9)^(1-18-9)
26