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.

Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	USNO-A2.0	RAJ2000 deg	DEJ2000 deg	ACTflag	Mflag	Bmag mag	Rmag mag	Epoch yr
1	1.856	02 25 26.38944	+28 27 56.8116	1125-00774946	036.359956	+28.465781			14.9	14.2	1954.758
2	9.079	02 25 26.29416	+28 28 04.1232	1125-00774935	036.359559	+28.467812			19.3	18.4	1954.758

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Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	APM-ID	RAJ2000 deg	DEJ2000 deg	rmag mag	l_	rClass	rStel	rDiam arcsec	rEll	bmag mag	l_	bClass	bStel	bDiam arcsec	b-r mag	Mflag
1	0.337	02 25 26.32944	+28 27 55.3608	EO1248-0346244	036.359706	+28.465378	13.69		2	58.03	28.4	0.57	14.46		1	13.95	26.6	0.77
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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.

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	1.379	02 25 26.40048	+28 27 56.2068	N333232115416	036.360002	+28.465613	1989.825	14.56	0.42	14.39	0.41	3	8.44	0.32

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Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	USNO-B1.0	RAJ2000 deg	DEJ2000 deg	e_RAJ2000 mas	e_DEJ2000 mas	Epoch yr	pmRA mas/yr	pmDE mas/yr	Ndet	B1mag mag	R1mag mag	B2mag mag	R2mag mag	Imag mag
1	1.602	02 25 26.39088	+28 27 56.5308	1184-0034830	036.359962	+28.465703	68	97	1975.3	0	0	5	14.54	13.52	12.90	13.85	14.98
2	1.783	02 25 26.47680	+28 27 54.9900	1184-0034832	036.360320	+28.465275	48	999	1977.4	64	134	3		18.26	18.57		14.53
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%3cEM%3e2&%3cFONT%20COLOR=%27#CD5B45%27>%201.783&%3cFONT%20COLOR=%27#CD5B45%27>02%2025%2026.47680&%3cFONT%20COLOR=%27#CD5B45%27>%2b28%2027%2054.9900&1184-0034832&036.360320&%2b28.465275&%2048&999&1977.4&%20%20%20%2064&%20%20%20134&3&%20&18.26&18.57&%20&14.53%3cBR%3e">\Ahref='VizieR-5?-ref=VIZ664140682dc452&-out.add=.&-source=I/284/out&USNO-B1.0===1184-0034831&-out.orig=o' class='full'3 4.30202 25 26.39472+28 27 59.31001184-0034831036.359978+28.4664756169681966.4 28 -102319.5918.88    17.75 4 6.32902 25 26.38152+28 28 01.37281184-0034829036.359923+28.4670482469991972.3 0 02  17.84    18.14 5 8.66702 25 26.12736+28 27 46.87201184-0034828036.358864+28.4630208618701965.7 0 0319.2118.2517.80     %0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20The%20Naval%20Observatory%20Merged%20Astrometric%20Dataset%20%28NOMAD%29%20contains%0aastrometric%20and%20photometric%20data%20for%20over%201%20billion%20stars%20derived%20from%0athe%20Hipparcos%20%28I/239%29,%20Tycho-2%20%28I/259%29,%20UCAC2%20%28I/289%29,%20and%20USNO-B1.0%0a%28I/284%29%20catalogs%20for%20astrometry%20and%20optical%20photometry,%20supplemented%0aby%202MASS%20%28II/246%29%20near-infrared%20photometry.%3cBR%3e%0a%3cFONT%20SIZE=%27-1%27%3eAn%20efficient%20remote%20query%20program%20%3cB%3efindnomad1%20is%0aavailable%20in%20the%20cdsclient%20%0apackage,%20for%20Unix/Linux%20platforms%0a%3cP%3e%0a

Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	NOMAD1	YM	RAJ2000 deg	DEJ2000 deg	r	pmRA mas/yr	e_ (...)	pmDE mas/yr	e_ (...)	Bmag mag	r_	Vmag mag	r_	Rmag mag	r_	Jmag mag	Hmag mag	Kmag mag	R
1	1.600	02 25 26.390664	+28 27 56.53008	1184-0035017	YM	036.3599611	+28.4657028	B	0.0	0.0	0.0	0.0	17.410	Y	16.740	Y	13.850	B	16.352	15.874	14.615
2	1.781	02 25 26.476656	+28 27 54.99000	1184-0035019	..	036.3603194	+28.4652750	B	64.0	1.0	134.0	155.0	18.570	B			18.260	e
3	4.302	02 25 26.394672	+28 27 59.31000	1184-0035018	..	036.3599778	+28.4664750	B	28.0	16.0	-102.0	25.0	19.590	o			18.880	e
4	6.326	02 25 26.381328	+28 28 01.36992	1184-0035016	..	036.3599222	+28.4670472	B	0.0	0.0	0.0	0.0					17.840	e
5	8.670	02 25 26.127336	+28 27 46.86984	1184-0035015	..	036.3588639	+28.4630194	B	0.0	0.0	0.0	0.0	17.800	B			18.250	e

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>	\BegDIVclass='sort-down ' </A>
dec 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	1.384	02 25 26.40072	+28 27 56.2104	NCL5015416	036.360003	+28.465614	1989.825	14.56	14.39	16.15	15.61	3	8.44	0.32

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Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	RAJ2000 deg	DEJ2000 deg	pmRA mas/yr	pmDE mas/yr	Jmag mag	Kmag mag	b1mag mag	b2mag mag	r1mag mag	r2mag mag	imag mag	No	fl
1	0.128	02 25 26.34336	+28 27 55.1916	036.359764	+28.465331	16.2	136.7	16.352	14.616		18.57	18.26		14.53	4	1
2	0.135	02 25 26.34024	+28 27 55.1988	036.359751	+28.465333	-19.5	-35.9	16.352	14.616	14.54	12.90	13.52	13.85	14.98	6	1
3	4.125	02 25 26.40096	+28 27 59.1156	036.360004	+28.466421	31.6	-116.8			19.59		18.88		17.75	3	0
4	7.819	02 25 26.38896	+28 28 02.8596	036.359954	+28.467461	5.6	28.1					17.84		18.14	2	0
5	9.482	02 25 26.02248	+28 27 46.5696	036.358427	+28.462936	-32.3	-23.4			19.21	17.80	18.25			3	1

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