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	13.768	06 35 13.81608	-62 39 54.7308	0225-03118076	098.807567	-62.665203			19.0	17.7	1982.476
2	23.421	06 35 13.03608	-62 39 46.2708	0225-03117939	098.804317	-62.662853			20.1	17.1	1981.014
3	25.088	06 35 13.08072	-62 39 43.7508	0225-03117946	098.804503	-62.662153			16.7	16.4	1982.476

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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	25.253	06 35 13.06344	-62 39 43.6356	S11213336516	098.804431	-62.662121	1996.134	16.42	0.20	18.11	0.36	0	4.34	0.17

%0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20The%20%3cB%3eUSNO-B%20Catalog%20presents%20positions,%20proper%20motions,%20%0amagnitudes%20un%20blue,%20red%20and%20infrared,%20as%20well%20as%20star/galaxy%20estimators%0afor%201,045,175,762%20objects%20derived%20from%203,648,832,040%20separate%20observations.%0aThe%20data%20were%20taken%20from%20scans%20of%207,435%20Schmidt%20plates%0ataken%20from%20various%20sky%20surveys%20during%20the%20last%2050%20years.%3cBR%3e%0aUSNO-B1.0%20catalog%20was%20created%20by%20Dave%20Monet%20and%20collaborators%0aat%20http://www.nofs.navy.mil/data/fchpix/%20%3cBR%3e%0a%3cB%3e%3cFONT%20COLOR=%27#EE0000%27>%20Note%20that%20the%20star/galaxy%20estimators%20may%20be%20mixed%20up%0a%20in%20dense%20regions.%0a%3cP%3e%0a%22>

>	\BegDIVclass='sort-down ' </A>
dec 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	0.257	06 35 15.40608	-62 40 02.7804	0273-0095603	098.814192	-62.667439	96	164	1988.0	0	0	2			21.68	20.98
2	13.416	06 35 13.86480	-62 39 54.8712	0273-0095593	098.807770	-62.665242	453	172	1986.6	0	0	3		19.65	19.98	19.58
3	13.717	06 35 13.77552	-62 39 55.2024	0273-0095591	098.807398	-62.665334	943	348	1984.0	0	0	3		19.48	20.80	19.74
4	21.442	06 35 13.09680	-62 39 48.6900	0273-0095588	098.804570	-62.663525	228	587	1985.0	12	-126	3		19.86	21.02		18.20
5	24.913	06 35 13.06008	-62 39 44.1000	0273-0095587	098.804417	-62.662250	66	35	1986.7	0	0	4		16.86	17.28	16.46	16.36

Note: The Naval Observatory Merged Astrometric Dataset (NOMAD) contains astrometric and photometric data for over 1 billion stars derived from the Hipparcos (I/239), Tycho-2 (I/259), UCAC2 (I/289), and USNO-B1.0 (I/284) catalogs for astrometry and optical photometry, supplemented by 2MASS (II/246) near-infrared photometry.
An efficient remote query program findnomad1 is available in the cdsclient package, for Unix/Linux platforms

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	0.258	06 35 15.406008	-62 40 02.78004	0273-0095508	..	098.8141917	-62.6674389	B	0.0	0.0	0.0	0.0	21.680	B			20.980	B
2	13.417	06 35 13.864656	-62 39 54.87012	0273-0095498	..	098.8077694	-62.6652417	B	0.0	0.0	0.0	0.0	19.980	B			19.580	B
3	13.720	06 35 13.775328	-62 39 55.19988	0273-0095496	..	098.8073972	-62.6653333	B	0.0	0.0	0.0	0.0	20.800	B			19.740	B
4	21.442	06 35 13.096656	-62 39 48.69000	0273-0095493	..	098.8045694	-62.6635250	B	12.0	14.0	-126.0	36.0	21.020	B			19.860	e
5	24.913	06 35 13.060008	-62 39 44.10000	0273-0095492	YM	098.8044167	-62.6622500	B	0.0	0.0	0.0	0.0	16.950	Y	16.720	Y	16.460	B	15.772	15.336	15.316

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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	0.601	06 35 15.38232	-62 40 02.4672	S4FZ014997	098.814093	-62.667352	1979.974		21.39			3	1.12	0.01
2	13.614	06 35 13.84872	-62 39 54.6912	S4FZ006465	098.807703	-62.665192	1995.066	19.28	20.00			3	3.31	0.42
3	25.358	06 35 13.04952	-62 39 43.5780	S4FZ006516	098.804373	-62.662105	1995.066	16.35	16.97		16.03	3	3.85	0.13

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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	0.582	06 35 15.38472	-62 40 02.4816	098.814103	-62.667356	-7.3	13.9				21.68		20.98		2	0
2	13.199	06 35 13.90848	-62 39 54.8388	098.807952	-62.665233	35.5	-4.5				19.98	19.65	19.58		3	0
3	14.889	06 35 13.56336	-62 39 55.2996	098.806514	-62.665361	-58.3	-20.1				20.80	19.48	19.74		3	0
4	21.391	06 35 13.11768	-62 39 48.6072	098.804657	-62.663502	20.7	-128.0				21.02	19.86		18.20	3	0
5	25.165	06 35 13.06776	-62 39 43.7256	098.804449	-62.662146	1.9	23.5	15.773	15.316		17.28	16.86	16.46	16.36	5	0

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