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	1.258	03 45 46.14216	+46 40 05.9520	1350-03836483	056.442259	+46.668320			17.8	17.0	1954.758
2	2.947	03 45 46.25616	+46 40 04.3212	1350-03836515	056.442734	+46.667867			17.5	17.1	1954.758
3	7.853	03 45 45.55344	+46 40 12.2016	1350-03836296	056.439806	+46.670056			17.7	16.6	1954.758

%0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20The%20construction%20of%20the%20%0a%3cB%3eGSC-II%20%0ais%20still%20in%20progress:%20this%0aversion%20has%20no%20proper%20motions,%20and%20the%20magnitude%20limits%20are%2018.5%20in%20F%20%28red%29%0aand%2019.5%20in%20J%20%28blue%29.%20The%20data%20are%20%3cB%3e%3cFONT%20COLOR=%27#0000CD%27>copyrighted,%20check%20%0athe%20%3cB%3edata%20use%20Policy.%0a%3cP%3e%0a

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	4.015	03 45 46.41000	+46 40 06.0492	N332112249424	056.443375	+46.668347	1993.061			14.30	0.42	3	17.59	0.40

%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	0.915	03 45 46.09416	+46 40 06.4920	1366-0088600	056.442059	+46.668470	131	87	1973.4	0	0	4	19.86	17.10		16.83	16.20
2	1.156	03 45 46.09944	+46 40 05.1708	1366-0088601	056.442081	+46.668103	224	596	1967.5	-26	18	3	18.53	17.25	16.86
3	2.425	03 45 46.19016	+46 40 04.3104	1366-0088603	056.442459	+46.667864	105	250	1977.4	0	0	5	18.52	17.69	15.40	16.84	16.41
4	2.843	03 45 45.99672	+46 40 08.8212	1366-0088599	056.441653	+46.669117	567	305	1980.8	0	0	3		17.09	16.95		17.70
5	3.687	03 45 46.14936	+46 40 02.5500	1366-0088602	056.442289	+46.667375	96	244	1954.7	0	0	2	19.19	18.15
6	7.981	03 45 45.53688	+46 40 12.2304	1366-0088596	056.439737	+46.670064	627	59	1954.7	0	0	2	18.76	16.74

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	0.912	03 45 46.093992	+46 40 06.48984	1366-0089859	..	056.4420583	+46.6684694	B	0.0	0.0	0.0	0.0	19.860	o			16.830	B
2	1.156	03 45 46.099344	+46 40 05.17008	1366-0089860	..	056.4420806	+46.6681028	B	-26.0	6.0	18.0	16.0	16.860	B			17.250	e
3	2.424	03 45 46.189992	+46 40 04.31004	1366-0089862	..	056.4424583	+46.6678639	B	0.0	0.0	0.0	0.0	15.400	B			16.840	B
4	2.842	03 45 45.996672	+46 40 08.82012	1366-0089858	..	056.4416528	+46.6691167	B	0.0	0.0	0.0	0.0	16.950	B			17.090	e
5	3.687	03 45 46.149336	+46 40 02.55000	1366-0089861	..	056.4422889	+46.6673750	B	0.0	0.0	0.0	0.0	19.190	o			18.150	e
6	7.982	03 45 45.536664	+46 40 12.23004	1366-0089855	..	056.4397361	+46.6700639	B	0.0	0.0	0.0	0.0	18.760	o			16.740	e
[****ClosingBrace(s)Inserted****]
6	7.982	03 45 45.536664	+46 40 12.23004	1366-0089855	..	056.4397361	+46.6700639	B	0.0	0.0	0.0	0.0	18.760	o			16.740	e

%22>\EndTABLESORT

Note: This version of the GSC-II has no proper motions, but the limits on brightness which existed on GSC2.2 (F<18.5, B_j<19.5) were removed.

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	4.017	03 45 46.41024	+46 40 06.0528	NCBE049424	056.443376	+46.668348	1993.061		14.30			3	17.59	0.40

%0a%0a

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	0.812	03 45 46.09152	+46 40 06.3300	056.442048	+46.668425	-4.6	-3.1			19.86		17.10	16.83	16.20	4	0
[****ClosingBrace(s)Inserted****]
">

%3cEM%3e1&%3cFONT%20COLOR=%27#CD5B45%27>%200.812&%3cFONT%20COLOR=%27#CD5B45%27>03%2045%2046.09152&%3cFONT%20COLOR=%27#CD5B45%27>%2b46%2040%2006.3300&056.442048&%2b46.668425&%20%20%20%20-4.6&%20%20%20%20-3.1&%20&%20&19.86&%20&17.10&16.83&16.20&%204&%200%3cBR%3e">\Ahref='VizieR-5?-ref=VIZ663f4a68388a8a&-out.add=.&-source=I/317/sample&PPMXL===%20426475180253813349' class='full'2 1.45303 45 46.11120+46 40 04.8792056.442130+46.668022 -27.2 9.2    18.5316.8617.25     3 0 3 2.41803 45 46.20072+46 40 04.4436056.442503+46.667901 0.6 4.2    18.5215.4017.6916.8416.41 5 0 4 2.84303 45 46.00800+46 40 08.8284056.441700+46.669119 11.2 2.0      16.9517.09  17.70 3 0 %0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20%3cP%3e%0a

Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	RAJ2000 deg	DEJ2000 deg	e_RAJ2000 (...)	e_DEJ2000 arcsec	magBJ mag	e_ mag	magRF mag	e_ mag	magG mag	e_ mag	magGrvs mag	e_ mag	alphaEpoch yr	deltaEpoch yr	pmRA mas/yr	e_ (...)	pmDE mas/yr	e_ (...)
1	0.812	03 45 46.09154	+46 40 06.3299	056.442048	+46.668425	0.115	0.115	19.860	0.400	16.830	0.400	16.541	0.400	14.605	0.500	1973.4800	1973.4800	-4.6	6.1	-3.1	6.1
2	1.453	03 45 46.11122	+46 40 04.8789	056.442130	+46.668022	0.133	0.133	16.860	0.400	17.250	0.400	17.117	0.400	17.339	0.500	1967.5200	1967.5200	-27.2	7.4	9.2	7.4
3	2.418	03 45 46.20077	+46 40 04.4442	056.442503	+46.667901	0.103	0.103	14.299	0.300	16.840	0.400	16.354	0.400	18.144	0.500	1977.4000	1977.4000	0.6	5.5	4.2	5.5
4	2.843	03 45 46.00800	+46 40 08.8280	056.441700	+46.669119	0.133	0.133	16.950	0.400	17.090	0.400	17.033	0.400	17.060	0.500	1980.8300	1980.8300	11.2	7.2	2.0	7.2

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