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	17.662	20 20 52.41336	+22 10 29.0316	1050-17342125	305.218389	+22.174731			18.6	18.0	1956.357
2	19.767	20 20 50.46000	+22 10 36.8004	1050-17340124	305.210250	+22.176889			17.9	16.7	1956.357
3	24.123	20 20 50.78688	+22 09 57.6612	1050-17340470	305.211612	+22.166017			18.2	16.7	1956.357
4	25.154	20 20 53.03400	+22 10 27.5412	1050-17342694	305.220975	+22.174317			18.4	17.7	1956.357
5	29.517	20 20 49.17288	+22 10 18.2820	1050-17338819	305.204887	+22.171745			16.6	16.4	1956.357

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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	17.665	20 20 52.40592	+22 10 29.2296	N031231116286	305.218358	+22.174786	1990.707	17.95	0.45	19.17	0.44	0	2.19	0.17
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%3cEM%3e1&%3cFONT%20COLOR=%27#CD5B45%27>17.665&%3cFONT%20COLOR=%27#CD5B45%27>20%2020%2052.40592&%3cFONT%20COLOR=%27#CD5B45%27>%2b22%2010%2029.2296&N031231116286&305.218358&%2b22.174786&1990.707&17.95&%200.45&19.17&%200.44&0&%20%202.19&%200.17%3cBR%3e">\Ahref='VizieR-5?-ref=VIZ663d78bd3c40f8&-out.add=.&-source=I/271/out&GSC2.2===N031231116477' class='full'220.04620 20 50.45520+22 10 37.0956N031231116477305.210230+22.1769711990.70716.48 0.4418.24 0.443 3.34 0.34 320.87220 20 49.80864+22 10 24.2112N031231116180305.207536+22.1733921990.70718.07 0.45    3 2.17 0.10 424.37320 20 50.77776+22 09 57.4380N031231115542305.211574+22.1659551990.70716.76 0.4418.67 0.443 2.97 0.22 525.11720 20 53.02920+22 10 27.6384N031231116261305.220955+22.1743441990.70717.44 0.4418.81 0.443 3.66 0.39 629.52520 20 49.17168+22 10 18.3936N031231116074305.204882+22.1717761990.70716.16 0.4417.30 0.430 2.75 0.03 %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

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	11.533	20 20 51.47544	+22 10 31.9908	1121-0557169	305.214481	+22.175553	9	119	1990.6	0	0	2			20.13	19.51
2	16.000	20 20 52.25400	+22 10 11.9820	1121-0557180	305.217725	+22.169995	999	279	1973.4	0	0	2	20.34		19.73
3	17.405	20 20 52.51752	+22 10 17.2308	1121-0557192	305.218823	+22.171453	96	53	1992.9	0	0	3			19.85	18.89	18.30
4	17.450	20 20 52.39800	+22 10 28.9812	1121-0557188	305.218325	+22.174717	73	100	1978.3	0	0	5	19.44	18.02	18.66	17.69	17.64
5	19.937	20 20 50.45016	+22 10 36.9120	1121-0557150	305.210209	+22.176920	45	142	1978.3	0	0	5	18.65	16.77	17.59	16.43	15.70
6	21.207	20 20 49.78200	+22 10 24.0204	1121-0557132	305.207425	+22.173339	102	59	1983.7	0	0	4		18.15	19.74	18.13	17.59
7	22.463	20 20 52.86936	+22 10 25.6008	1121-0557197	305.220289	+22.173778	212	5	1973.5	0	0	2		18.80		18.72
8	24.398	20 20 50.77344	+22 09 57.4308	1121-0557154	305.211556	+22.165953	91	66	1978.3	0	0	5	18.99	16.88	18.07	16.64	16.27
9	24.769	20 20 53.01000	+22 10 27.3000	1121-0557200	305.220875	+22.174250	59	118	1978.3	0	0	5	19.15	17.67	18.15	17.39	17.00
10	24.782	20 20 49.51872	+22 10 23.6604	1121-0557124	305.206328	+22.173239	999	999	1993.0	0	0	2			20.38		18.40
11	26.420	20 20 52.68816	+22 10 02.8308	1121-0557194	305.219534	+22.167453	41	240	1991.6	0	0	2			19.78	18.41
12	29.637	20 20 49.16472	+22 10 18.2028	1121-0557112	305.204853	+22.171723	35	35	1978.3	0	0	5	17.48	16.44	17.03	15.99	15.57

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>	\BegDIVclass='sort-down ' </A>
dec 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	11.532	20 20 51.475344	+22 10 31.99008	1121-0587020	..	305.2144806	+22.1755528	B	0.0	0.0	0.0	0.0	20.130	B			19.510	B
2	16.001	20 20 52.254000	+22 10 11.97984	1121-0587034	..	305.2177250	+22.1699944	B	0.0	0.0	0.0	0.0	19.730	B
3	17.402	20 20 52.517328	+22 10 17.23008	1121-0587045	..	305.2188222	+22.1714528	B	0.0	0.0	0.0	0.0	19.850	B			18.890	B
4	17.449	20 20 52.398000	+22 10 28.98012	1121-0587041	YM	305.2183250	+22.1747167	B	0.0	0.0	0.0	0.0	17.800	Y	15.960	Y	17.690	B	16.449	16.138	15.641
5	19.937	20 20 50.449992	+22 10 36.90984	1121-0587003	YM	305.2102083	+22.1769194	B	0.0	0.0	0.0	0.0	17.710	Y	16.860	Y	16.430	B	15.335	14.644	14.473
6	21.207	20 20 49.782000	+22 10 24.02004	1121-0586984	YM	305.2074250	+22.1733389	B	0.0	0.0	0.0	0.0	19.740	B	17.540	Y	18.130	B	16.277	15.609	15.810
7	22.463	20 20 52.869336	+22 10 25.60008	1121-0587050	..	305.2202889	+22.1737778	B	0.0	0.0	0.0	0.0					18.720	B
8	24.399	20 20 50.773344	+22 09 57.43008	1121-0587007	YM	305.2115556	+22.1659528	B	0.0	0.0	0.0	0.0	17.540	Y	16.900	Y	16.640	B	15.336	14.669	14.458
9	24.769	20 20 53.010000	+22 10 27.30000	1121-0587053	YM	305.2208750	+22.1742500	B	0.0	0.0	0.0	0.0	18.320	Y	17.530	Y	17.390	B	16.361	15.490	16.033
10	24.782	20 20 49.518672	+22 10 23.66004	1121-0586977	..	305.2063278	+22.1732389	B	0.0	0.0	0.0	0.0	20.380	B
11	26.419	20 20 52.687992	+22 10 02.83008	1121-0587047	..	305.2195333	+22.1674528	B	0.0	0.0	0.0	0.0	19.780	B			18.410	B
12	29.638	20 20 49.164672	+22 10 18.19992	1121-0586962	YM	305.2048528	+22.1717222	B	0.0	0.0	0.0	0.0	16.570	Y	16.090	Y	15.990	B	14.726	14.119	14.070

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Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	CMC14	f_	RAICRS deg	DEICRS deg	r'mag mag	Nt	Jmag mag	Hmag mag	Ksmag mag
1	18.969	20 20 50.47584	+22 10 35.9724	202050.4+221035		305.210316	+22.176659	17.071	2
2	24.923	20 20 50.77824	+22 09 56.8620	202050.7+220956		305.211576	+22.165795	17.023	4	15.337	14.670	14.459
3	29.674	20 20 49.16376	+22 10 17.9436	202049.1+221017		305.204849	+22.171651	16.411	4	14.726	14.120	14.070

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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	9.359	20 20 51.92472	+22 10 23.9016	N2PH016138	305.216353	+22.173306	1990.707	20.02	21.43			3	1.41	0.36
2	11.789	20 20 51.48768	+22 10 32.2140	N2PH016323	305.214532	+22.175615	1990.707	19.39	21.03			3	1.56	0.18
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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	16.185	20 20 52.27416	+22 10 12.0756	305.217809	+22.170021	30.6	2.8			20.34	19.73				2	0
2	17.471	20 20 52.40208	+22 10 28.9200	305.218342	+22.174700	1.3	0.1	16.450	15.641	19.44	18.66	18.02	17.69	17.64	6	0
3	20.887	20 20 50.42184	+22 10 37.7976	305.210091	+22.177166	-10.7	25.9	15.335	14.473	18.65	17.59	16.77	16.43	15.70	6	1
4	20.956	20 20 49.79616	+22 10 23.6388	305.207484	+22.173233	9.1	-7.8	16.278	15.810		19.74	18.15	18.13	17.59	5	0
5	22.458	20 20 52.87272	+22 10 25.3596	305.220303	+22.173711	4.0	-4.7					18.80	18.72		2	0
6	24.673	20 20 53.00592	+22 10 27.1416	305.220858	+22.174206	-2.7	-4.5	16.361	16.034	19.15	18.15	17.67	17.39	17.00	6	0
7	24.887	20 20 50.76480	+22 09 56.9556	305.211520	+22.165821	-1.9	-11.9	15.337	14.459	18.99	18.07	16.88	16.64	16.27	6	0
8	29.707	20 20 49.16088	+22 10 18.0120	305.204837	+22.171670	-2.1	-1.6	14.726	14.070	17.48	17.03	16.44	15.99	15.57	6	0

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