VizieR

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The 3 columns in color are computed by VizieR, and are not part of the original data.

Note: The Guide Star Catalog has been constructed to support the operational need of the Hubble Space Telescope. It contains over 25 million positions for about 19 million objects, of which more than 15 million are classified as stars. The version 1.2 is a new astrometric reduction which results in absolute position errors about 0.3-0.4 arcsec. (see GSC pages at URL http://www-gsss.stsci.edu/gsc/gsc.html)

I/254/out
Post annotation The HST Guide Star Catalog, Version 1.2 (Lasker+ 1996)
ReadMe+ftp
2001AJ....121.1752M
metaI/254/out

The Full Catalogue (25241730 positions) (25241730 rows)

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Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	GSC	RAJ2000 deg	DEJ2000 deg	PosErr arcsec	Pmag mag	e_ mag	n_	Class	Plate	Epoch yr
1	0.00	20 19 08.4408	-16 48 00.108	0632800223	304.78517	-16.80003	0.3	14.46	0.40	0	0	006M	1979.481
2	0.07	20 19 08.4360	-16 48 00.108	0632800223	304.78515	-16.80003	0.4	14.46	0.40	0	0	01D0	1977.686

Note: The GSC-ACT (or GSC1.3) is a recalibration of the GSC1.1, the catalogue constructed to support the operational need of the Hubble Space Telescope, with the ACT, the combination of the Astrographic Catalogue and the Tycho catalogue derived from the Hipparcos mission; see http://www.projectpluto.com/gsc_act.htm for more details about this recalibration.

I/255/out
Post annotation The HST Guide Star Catalog, Version GSC-ACT (Lasker+ 1996-99)
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metaI/255/out

The GSC-ACT Full Catalogue (25241730 positions) (25241730 rows)

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Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	GSC	RAJ2000 deg	DEJ2000 deg	PosErr arcsec	Pmag mag	e_ mag	n_	Class	Epoch yr
1	0.11	20 19 08.4480	-16 48 00.144	0632800223	304.78520	-16.80004	0.3	14.48	0.40	0	0	1979.481
2	0.37	20 19 08.4216	-16 48 00.360	0632800223	304.78509	-16.80010	0.4	14.47	0.40	0	0	1977.686

Note: The construction of the GSC-II is still in progress: this version has no proper motions, and the magnitude limits are 18.5 in F (red) and 19.5 in J (blue). The data are copyrighted, check the data use Policy.

I/271/out
Post annotation The GSC 2.2 Catalogue (STScI, 2001)
ReadMe+ftp

metaI/271/out

The Full GSC2.2.1 Catalogue (455851237 objects) (455851237 rows)

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Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	GSC2.2	RA(ICRS) deg	DE(ICRS) deg	Epoch yr	Rmag mag	e_ mag	Bjmag mag	e_ mag	Class	a pix	e
1	0.048	20 19 08.43816	-16 48 00.1368	S33112121156	304.785159	-16.800038	1984.705	13.43	0.39	14.32	0.38	0	5.78	0.04

Note: This version of the GSC-II has no proper motions, but the limits on brightness which existed on GSC2.2 (F<18.5, B_j<19.5) were removed.

I/305/out
Post annotation The Guide Star Catalog, Version 2.3.2 (GSC2.3) (STScI, 2006)
ReadMe+ftp
2008AJ....136..735L
metaI/305/out

The Full GSC2.3.2 Catalogue (945592683 objects) (945592683 rows)

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Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	GSC2.3	RAJ2000 deg	DEJ2000 deg	Epoch yr	Fmag mag	jmag mag	Vmag mag	Nmag mag	Class	a pix	e
1	0.041	20 19 08.43840	-16 48 00.1296	SC4M001156	304.785160	-16.800036	1984.705	13.43	14.32		13.05	0	5.78	0.04

I/353/gsc242
Post annotation

The Guide Star Catalog, Version 2.4.2 (GSC2.4.2) (STScI, 2020)

ReadMe+ftp

2008AJ....136..735L

Guide Star Catalogue, Version 2.4.2 (original column names in green) (3485671481 rows)

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Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	GSC2	RA_ICRS deg	DE_ICRS deg	objID	Epoch yr	Class	Gmag mag	OMag mag	Bjmag mag	Fpgmag mag	Epgmag mag	Npgmag mag	Umag mag	Bmag mag	Vmag mag	umag mag	gmag mag	rmag mag	imag mag	zmag mag	ymag mag	Jmag mag	Hmag mag	Ksmag mag	Zmag mag	Ymag mag	W1mag mag	W2mag mag	W3mag mag	W4mag mag	FUVmag mag	NUVmag mag	a pix	e pix	PA pix
1	0.209	20 19 08.4343481361	-16 48 00.152127278	SC4M001156	304.78512180357	-16.80006530642	233112121156	2015.500	0	13.772416	14.703700	14.320200	13.425700		13.051800		14.835000	14.074000	15.969	14.221	13.927	13.606	13.561	13.3856	12.722	12.031	12.198			11.985	12.012	11.704	8.729		19.453	5.783	0.041	79.2

Note: The Guide Star Catalog has been constructed to support the operational need of the Hubble Space Telescope; it is primarily based on an all-sky, single epoch, single passband collection of Schmidt plates. It contains over 25 million positions for about 19 million objects, of which more than 15 million are classified as stars.

I/220/out
Post annotation The HST Guide Star Catalog, Version 1.1 (Lasker+ 1992)
ReadMe+ftp

metaI/220/out

The Full Catalogue (25258765 positions) (25258765 rows)

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Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	GSC	RAJ2000 deg	DEJ2000 deg	PosErr arcsec	Pmag mag	e_ mag	n_	Class
1	0.30	20 19 08.4240	-16 47 59.928	0632800223	304.78510	-16.79998	0.3	14.48	0.40	0	0
2	0.83	20 19 08.4048	-16 47 59.460	0632800223	304.78502	-16.79985	0.4	14.47	0.40	0	0

Target Name (resolved by Sesame) or Position:	Target dimension:
NB: The epoch used for the query is the original epoch of the table(s)	Radius Box size