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	12.602	03 58 12.31152	+18 35 06.0432	1050-01090261	059.551298	+18.585012			15.0	10.6	1950.936
2	21.500	03 58 12.22536	+18 35 15.1008	1050-01090252	059.550939	+18.587528			17.0	17.1	1950.936

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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	12.985	03 58 12.32352	+18 35 06.5400	EO0223-0266428	059.551348	+18.585150	9.66		1	7.85	31.1	0.29	10.79		1	9.32	29.9	1.13
[****ClosingBrace(s)Inserted****]
">

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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	12.632	03 58 12.34056	+18 35 06.2592	N30220103778	059.551419	+18.585072	1991.782	10.91	0.43	12.77	0.41	3	12.91	0.36

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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	3.833	03 58 12.93672	+18 34 53.2020	1085-0044846	059.553903	+18.581445	232	79	1971.3	0	0	2	20.66			20.68
2	5.875	03 58 12.35808	+18 34 58.1916	1085-0044842	059.551492	+18.582831	146	209	1971.3	0	0	2	17.33			15.21
[****ClosingBrace(s)Inserted****]
">

%3cEM%3e2&%3cFONT%20COLOR=%27#CD5B45%27>%205.875&%3cFONT%20COLOR=%27#CD5B45%27>03%2058%2012.35808&%3cFONT%20COLOR=%27#CD5B45%27>%2b18%2034%2058.1916&1085-0044842&059.551492&%2b18.582831&146&209&1971.3&%20%20%20%20%200&%20%20%20%20%200&2&17.33&%20&%20&15.21&%20%3cBR%3e">\Ahref='VizieR-5?-ref=VIZ663f661e11c97f&-out.add=.&-source=I/284/out&USNO-B1.0===1085-0044848&-out.orig=o' class='full'3 7.60703 58 13.08216+18 34 59.74321085-0044848059.554509+18.583262 329991964.5 178 -230313.9416.11  19.36   412.19403 58 13.40400+18 35 01.30201085-0044849059.555850+18.5836958279991964.5 356 178319.4119.93  20.66   512.36103 58 12.32280+18 35 05.85241085-0044840059.551345+18.5849592414761965.8 0 0315.6710.71    10.16 616.86603 58 12.42408+18 35 11.07241085-0044843059.551767+18.5864099995451973.3 0 0215.88      15.01 718.78403 58 12.19152+18 35 12.04081085-0044838059.550798+18.5866782765561975.0 0 0517.6115.1415.2414.7515.06 820.00203 58 12.35736+18 35 14.07121085-0044841059.551489+18.5872426303031979.4 0 03  16.97  14.0816.09 921.09703 58 12.15336+18 35 14.31241085-0044837059.550639+18.5873095002931979.4 -204 -318320.93    16.3416.61 1021.44603 58 12.19344+18 35 14.89201085-0044839059.550806+18.5874703091401975.0 0 0517.7617.4617.4416.1616.52 %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	3.833	03 58 12.936672	+18 34 53.19984	1085-0045336	..	059.5539028	+18.5814444	B	0.0	0.0	0.0	0.0	20.660	o			20.680	B
2	5.875	03 58 12.358008	+18 34 58.19016	1085-0045332	..	059.5514917	+18.5828306	B	0.0	0.0	0.0	0.0	17.330	o			15.210	B
3	7.603	03 58 13.081992	+18 34 59.73996	1085-0045338	..	059.5545083	+18.5832611	B	178.0	0.0	-230.0	106.0	13.940	o			19.360	B
4	12.193	03 58 13.404000	+18 35 01.29984	1085-0045339	..	059.5558500	+18.5836944	B	356.0	20.0	178.0	47.0	19.410	o			20.660	B
5	12.360	03 58 12.322656	+18 35 05.84988	1085-0045330	YM	059.5513444	+18.5849583	B	0.0	0.0	0.0	0.0	17.100	o			10.710	e	15.172	14.335	14.208
6	16.864	03 58 12.424008	+18 35 11.06988	1085-0045333	..	059.5517667	+18.5864083	B	0.0	0.0	0.0	0.0	15.880	o
[****ClosingBrace(s)Inserted****]
6	16.864	03 58 12.424008	+18 35 11.06988	1085-0045333	..	059.5517667	+18.5864083	B	0.0	0.0	0.0	0.0	15.880	o

%22>\Ahref='VizieR-5?-ref=VIZ663f661e11c97f&-out.add=.&-source=I/297/out&NOMAD1===1085-0045328' class='full'718.78503 58 12.191328+18 35 12.040081085-0045328..059.5507972+18.5866778B 0.0 0.0 0.0 0.015.240B    14.750B         820.00103 58 12.357336+18 35 14.070121085-0045331..059.5514889+18.5872417B 0.0 0.0 0.0 0.0        14.080B         921.09403 58 12.153336+18 35 14.309881085-0045327..059.5506389+18.5873083B -204.0 17.0 -318.0 10.020.930o    16.340B         1021.44403 58 12.193344+18 35 14.889841085-0045329..059.5508056+18.5874694B 0.0 0.0 0.0 0.017.440B    16.160B         %0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20Zone%20-30/%2b50deg%3cP%3e%0a

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	10.987	03 58 12.27240	+18 35 03.9012	035812.2+183503		059.551135	+18.584417	15.788	1
2	14.480	03 58 12.61056	+18 35 09.0636	035812.6+183509		059.552544	+18.585851	17.375	1
3	16.028	03 58 12.39888	+18 35 10.1220	035812.3+183510		059.551662	+18.586145	17.399	1

%0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20This%20version%20of%20the%20%0a%3cB%3eGSC-II%0ahas%20no%20proper%20motions,%20but%20the%20limits%20on%20brightness%20which%20existed%20on%0a%20%28F<18.5,%20B_j<19.5%29%20were%20removed.%0a%25The%20data%20are%20%3cB%3e%3cFONT%20COLOR=%27#0000CD%27>copyrighted,%20check%0a%25the%20%3cB%3edata%20use%20Policy.%0a%3cP%3e%0a

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	12.635	03 58 12.34056	+18 35 06.2628	N9Z8003778	059.551419	+18.585073	1991.782	10.91	12.77	13.30	11.19	3	12.91	0.36
2	25.781	03 58 11.56416	+18 34 34.3740	N9Z8008260	059.548184	+18.576215	1985.954		21.98			3	1.80	0.46
[****ClosingBrace(s)Inserted****]
">

%3cEM%3e2&%3cFONT%20COLOR=%27#CD5B45%27>25.781&%3cFONT%20COLOR=%27#CD5B45%27>03%2058%2011.56416&%3cFONT%20COLOR=%27#CD5B45%27>%2b18%2034%2034.3740&N9Z8008260&059.548184&%2b18.576215&1985.954&%20&21.98&%20&%20&3&%20%201.80&%200.46%3cBR%3e">\EndTABLESORT

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	3.984	03 58 12.94704	+18 34 53.1624	059.553946	+18.581434	6.2	-4.9			20.66			20.68		2	0
2	5.834	03 58 12.35328	+18 34 58.0296	059.551472	+18.582786	-2.8	-11.5			17.33			15.21		2	0
3	7.434	03 58 13.08912	+18 34 59.3652	059.554538	+18.583157	178.5	-267.1			13.94		16.11	19.36		3	1
4	10.702	03 58 12.29568	+18 35 03.7716	059.551232	+18.584381	-5.2	-50.5	15.172	14.209	15.67		10.71		10.16	4	0
5	12.197	03 58 13.41456	+18 35 01.0716	059.555894	+18.583631	362.3	157.9			19.41		19.93	20.66		3	1
6	17.607	03 58 12.34392	+18 35 11.5440	059.551433	+18.586540	-24.6	5.5			15.88				15.01	2	0
7	18.688	03 58 12.19584	+18 35 11.9616	059.550816	+18.586656	7.3	-18.1			17.61	15.24	15.14	14.75	15.06	5	1
8	20.198	03 58 12.32976	+18 35 14.1756	059.551374	+18.587271	-8.9	-2.0					16.97	14.08	16.09	3	0
9	21.168	03 58 12.14280	+18 35 14.3304	059.550595	+18.587314	-208.0	-321.8			20.93			16.34	16.61	3	0
10	21.621	03 58 12.16728	+18 35 14.9460	059.550697	+18.587485	-10.0	-3.6			17.76	17.44	17.46	16.16	16.52	5	0
[****ClosingBrace(s)Inserted****]
10	21.621	03 58 12.16728	+18 35 14.9460	059.550697	+18.587485	-10.0	-3.6			17.76	17.44	17.46	16.16	16.52	5	0

%22>\EndTABLESORT

Note: