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	7.892	10 50 05.58408	-02 50 48.5304	0825-07316187	162.523267	-02.846814			18.1	16.5	1955.292

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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	8.316	10 50 05.61144	-02 50 48.6420	EO1397-0174754	162.523381	-02.846845	16.42		1	27.77	21.8	0.62	19.10		1	16.44	20.3	2.68
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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	8.130	10 50 05.59944	-02 50 48.5916	S1201030504	162.523331	-02.846831	1992.235	15.25	0.42	16.29	0.41	3	10.06	0.71

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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	2.460	10 50 05.22072	-02 50 47.6016	0871-0284352	162.521753	-02.846556	999	380	1980.4	0	0	3		18.66	17.93	18.94
2	5.813	10 50 05.43888	-02 50 48.5016	0871-0284353	162.522662	-02.846806	999	275	1984.4	0	0	4	19.65		17.15	15.01	17.40
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%3cEM%3e2&%3cFONT%20COLOR=%27#CD5B45%27>%205.813&%3cFONT%20COLOR=%27#CD5B45%27>10%2050%2005.43888&%3cFONT%20COLOR=%27#CD5B45%27>-02%2050%2048.5016&0871-0284353&162.522662&-02.846806&999&275&1984.4&%20%20%20%20%200&%20%20%20%20%200&4&19.65&%20&17.15&15.01&17.40%3cBR%3e">\Ahref='VizieR-5?-ref=VIZ6643799cd0624&-out.add=.&-source=I/284/out&USNO-B1.0===0871-0284348&-out.orig=o' class='full'3 7.35510 50 04.83288-02 50 40.04160871-0284348162.520137-02.8444569995141993.0 0 02    21.6421.00   4 7.70410 50 05.56872-02 50 48.65280871-0284355162.523203-02.846848 65 981974.8 0 0518.7616.6317.4715.4914.83 5 8.44010 50 05.62200-02 50 48.53040871-0284356162.523425-02.846814104 201983.1 0 04  16.7616.5415.6815.70 %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	2.459	10 50 05.220672	-02 50 47.60016	0871-0285983	..	162.5217528	-02.8465556	B	0.0	0.0	0.0	0.0	17.930	B			18.940	B
2	5.810	10 50 05.438664	-02 50 48.50016	0871-0285984	..	162.5226611	-02.8468056	B	0.0	0.0	0.0	0.0	17.150	B			15.010	B
3	7.358	10 50 04.832664	-02 50 40.04016	0871-0285979	..	162.5201361	-02.8444556	B	0.0	0.0	0.0	0.0	21.640	B			21.000	B
4	7.703	10 50 05.568672	-02 50 48.64992	0871-0285986	YM	162.5232028	-02.8468472	B	0.0	0.0	0.0	0.0	18.350	Y	17.510	Y	15.490	B	15.974	14.913	14.291
5	8.440	10 50 05.622000	-02 50 48.53004	0871-0285987	..	162.5234250	-02.8468139	B	0.0	0.0	0.0	0.0	16.540	B			15.680	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	8.129	10 50 05.59944	-02 50 48.5880	S4SS000504	162.523331	-02.846830	1992.235	15.25	16.29		15.63	3	10.06	0.71
2	8.749	10 50 04.77240	-02 50 38.9580	S4SS000514	162.519885	-02.844155	1991.050	20.25				3	2.25	0.55

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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	2.216	10 50 05.20824	-02 50 47.4324	162.521701	-02.846509	11.4	3.4				17.93	18.66	18.94		3	0
2	5.535	10 50 05.42496	-02 50 48.2604	162.522604	-02.846739	24.8	7.4			19.65	17.15		15.01	17.40	4	0
3	7.970	10 50 05.59200	-02 50 48.3900	162.523300	-02.846775	5.1	1.6	15.974	14.291	18.76	17.47	16.63		14.83	5	0
4	8.037	10 50 05.59656	-02 50 48.3936	162.523319	-02.846776	-15.1	1.2	15.974	14.291		16.54	16.76		15.70	4	0

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