VizieR

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The 1 column in color are computed by VizieR, and are not part of the original data.

Note: USNO-A2.0 contains 526,280,881 sources, and is based on a re-reduction of the Precision Measuring Machine (PMM) scans from POSS-I O and E plates (>=-18°) and SRC-J and ESO-R plates (<=-20°). USNO-A2.0 was created by Dave Monet () and collaborators at Flagstaff Station, U.S. Naval Observatory.
The major difference between USNO-A2.0 and its previous version USNO-A1.0 is that A1.0 used the Guide Star Catalog as its reference frame whereas A2.0 uses the ICRF as realized by the USNO ACT catalog (Urban et al. 1997). The VizieR search engine uses an on-line compressed version (3.6Gbytes) which was generated at CDS.

I/252/out The USNO-A2.0 Catalogue (Monet+ 1998)
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The Full Catalogue (526280881 rows) (Note)

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Full	_r arcsec	USNO-A2.0	RAJ2000 deg	DEJ2000 deg	ACTflag	Mflag	Bmag mag	Rmag mag	Epoch yr
1	1.199	1500-07110117	298.827884	+62.305742			13.1	12.8	1952.615

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 The HST Guide Star Catalog, Version 1.2 (Lasker+ 1996)
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2001AJ....121.1752M
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The Full Catalogue (25241730 positions) (25241730 rows)

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Full	_r arcsec	GSC	RAJ2000 deg	DEJ2000 deg	PosErr arcsec	Pmag mag	e_ mag	n_	Class	Plate	Epoch yr
1	0.09	0423500391	298.82764	+62.30541	0.2	12.60	0.40	1	0	00VM	1983.609

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 The HST Guide Star Catalog, Version GSC-ACT (Lasker+ 1996-99)
ReadMe+ftp

metaI/255/out

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

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Full	_r arcsec	GSC	RAJ2000 deg	DEJ2000 deg	PosErr arcsec	Pmag mag	e_ mag	n_	Class	Epoch yr
1	0.14	0423500391	298.82771	+62.30546	0.2	12.62	0.40	1	0	1983.609

I/259/tyc2

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

Full	_r arcsec	mode	q_	cl	SDSS9	m_	Im	RA_ICRS deg	DE_ICRS deg	ObsDate yr	Q	umag mag	e_ mag	gmag mag	e_ mag	rmag mag	e_ mag	imag mag	e_ mag	zmag mag	e_ mag	zsp
1	0.067	1		6	J195518.64+621819.4		Im	298.827668	+62.305405	2006.3938	3	14.859	0.004	14.448	0.010	12.121	0.002	15.517	0.013	12.860	0.004
2	0.162	2		6	J195518.63+621819.3		Im	298.827664	+62.305378	2006.3966	3	14.949	0.005	15.413	0.010	12.836	0.002	14.993	0.012	13.069	0.005

Full	_r arcsec	objID	RA_ICRS deg	DE_ICRS deg	mode	class	clean	e_RA_ICRS (...)	e_DE_ICRS (...)	umag mag	gmag mag	rmag mag	imag mag	zmag mag	e_umag mag	e_gmag mag	e_rmag mag	e_imag mag	e_zmag mag	zsp	e_	f_	zph	e_	<zph>	Q	SDSS16	Sp-ID	MJD d
1	0.067	1237671941423104306	298.827668	+62.305405	1	6	0	0.093	0.096	14.900	14.435	12.116	15.503	12.842	0.004	0.010	0.002	0.013	0.004							3	SDSS J195518.64+621819.4		53879.3432
2	0.162	1237671971475685440	298.827664	+62.305378	2	6	0	0.100	0.094	14.923	15.402	12.829	14.983	13.054	0.005	0.010	0.002	0.012	0.005							3	SDSS J195518.63+621819.3		53880.3618