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	2.903	08 10 41.23272	-64 55 27.3432	0225-04104463	122.671803	-64.924262			16.4	15.7	1979.693
2	26.169	08 10 37.53816	-64 55 31.1412	0225-04103443	122.656409	-64.925317			17.5	16.7	1979.693

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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	2.968	08 10 41.19072	-64 55 27.1524	S113320113584	122.671628	-64.924209	1991.131	15.38	0.29	16.23	0.34	0	3.77	0.11
2	26.187	08 10 37.52472	-64 55 30.8460	S113320113531	122.656353	-64.925235	1991.131	16.48	0.29	17.81	0.34	0	3.09	0.07

%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	2.947	08 10 41.22288	-64 55 27.3432	0250-0104650	122.671762	-64.924262	105	73	1985.1	0	0	4		14.87	16.13	15.42	14.80
2	17.490	08 10 44.04888	-64 55 17.9508	0250-0104660	122.683537	-64.921653	55	0	1983.6	0	0	2			19.99	20.66
3	18.138	08 10 43.82472	-64 55 14.3112	0250-0104659	122.682603	-64.920642	243	884	1983.6	0	0	2			20.34	20.44
4	26.421	08 10 37.50480	-64 55 31.3428	0250-0104631	122.656270	-64.925373	46	226	1985.1	-14	-10	4		16.40	17.32	16.43	16.12
5	26.731	08 10 45.74544	-64 55 26.9112	0250-0104665	122.690606	-64.924142	23	320	1983.6	0	0	2			20.26	21.07

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	2.945	08 10 41.222664	-64 55 27.33996	0250-0105147	YM	122.6717611	-64.9242611	B	0.0	0.0	0.0	0.0	16.610	Y	16.170	Y	15.420	B	14.843	14.564	14.337
2	17.489	08 10 44.048664	-64 55 17.95008	0250-0105157	..	122.6835361	-64.9216528	B	0.0	0.0	0.0	0.0	19.990	B			20.660	B
3	18.138	08 10 43.824672	-64 55 14.31012	0250-0105156	..	122.6826028	-64.9206417	B	0.0	0.0	0.0	0.0	20.340	B			20.440	B
4	26.421	08 10 37.504656	-64 55 31.33992	0250-0105128	YM	122.6562694	-64.9253722	B	-14.0	2.0	-10.0	14.0	17.000	Y	16.990	Y	16.430	B	15.329	14.826	14.898
5	26.731	08 10 45.745344	-64 55 26.91012	0250-0105162	..	122.6906056	-64.9241417	B	0.0	0.0	0.0	0.0	20.260	B			21.070	B

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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	2.963	08 10 41.19072	-64 55 27.1452	S4PT013584	122.671628	-64.924207	1991.131	15.38	16.23		14.97	0	3.77	0.11
2	17.406	08 10 44.02656	-64 55 17.8428	S4PT035287	122.683444	-64.921623	1991.131	20.04	20.93			3	2.07	0.52
3	26.185	08 10 37.52496	-64 55 30.8424	S4PT013531	122.656354	-64.925234	1991.131	16.48	17.81		16.11	0	3.09	0.07
4	26.487	08 10 45.71232	-64 55 26.2128	S4PT035264	122.690468	-64.923948	1991.131	20.34	21.65			3	1.47	0.40

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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	2.620	08 10 41.24304	-64 55 27.0048	122.671846	-64.924168	6.6	13.3	14.844	14.338		16.13	14.87	15.42	14.80	5	0
2	17.643	08 10 44.06256	-64 55 17.7744	122.683594	-64.921604	7.0	2.5				19.99		20.66		2	0
3	18.092	08 10 43.85640	-64 55 14.6604	122.682735	-64.920739	19.8	-56.6				20.34		20.44		2	0
4	26.181	08 10 37.52784	-64 55 30.9072	122.656366	-64.925252	-8.5	10.6	15.329	14.899		17.32	16.40	16.43	16.12	5	0
5	26.767	08 10 45.75648	-64 55 26.2236	122.690652	-64.923951	5.0	24.1				20.26		21.07		2	0

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