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	5.909	15 21 09.85944	+27 55 16.9824	1125-07238107	230.291081	+27.921384			18.6	18.1	1954.485
2	6.335	15 21 09.03408	+27 55 21.3924	1125-07238040	230.287642	+27.922609			13.6	12.7	1954.485

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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	5.875	15 21 09.06672	+27 55 21.0900	EO1092-0158625	230.287778	+27.922525	14.11		1	60.17	28.2	0.27	14.84		1	33.83	30.8	0.73
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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	6.231	15 21 09.03912	+27 55 20.9604	N133023312700	230.287663	+27.922489	1987.302	13.94	0.37	13.03	0.38	3	9.89	0.32

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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	2.995	15 21 09.30144	+27 55 19.4304	1179-0290195	230.288756	+27.922064	508	999	1970.8	0	0	2		17.66		17.88
2	3.724	15 21 09.55272	+27 55 16.9500	1179-0290198	230.289803	+27.921375	999	445	1980.5	40	-108	4		17.94	18.64	16.63	16.88
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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	2.997	15 21 09.301344	+27 55 19.43004	1179-0293786	..	230.2887556	+27.9220639	B	0.0	0.0	0.0	0.0					17.880	B
2	3.724	15 21 09.552672	+27 55 16.95000	1179-0293789	..	230.2898028	+27.9213750	B	40.0	52.0	-108.0	18.0	18.640	B			16.630	B
3	4.754	15 21 09.154656	+27 55 19.85988	1179-0293784	..	230.2881444	+27.9221833	B	0.0	0.0	0.0	0.0	17.870	o
4	4.946	15 21 09.851328	+27 55 18.67008	1179-0293794	..	230.2910472	+27.9218528	B	0.0	0.0	0.0	0.0					18.320	e
5	5.609	15 21 09.832656	+27 55 17.01984	1179-0293793	..	230.2909694	+27.9213944	B	0.0	0.0	0.0	0.0	18.530	B			17.750	B
6	6.048	15 21 09.054000	+27 55 21.15012	1179-0293782	YM	230.2877250	+27.9225417	B	0.0	0.0	0.0	0.0	17.780	Y			12.070	B	15.281	14.897	14.391
7	6.682	15 21 09.894000	+27 55 16.32000	1179-0293795	..	230.2912250	+27.9212000	B	46.0	3.0	-2.0	46.0	20.530	B
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7	6.682	15 21 09.894000	+27 55 16.32000	1179-0293795	..	230.2912250	+27.9212000	B	46.0	3.0	-2.0	46.0	20.530	B

%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	6.228	15 21 09.03936	+27 55 20.9640	N65R012700	230.287664	+27.922490	1987.302	13.94	13.03	14.55	13.04	3	9.89	0.32

%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	3.639	15 21 09.50376	+27 55 16.9896	230.289599	+27.921386	20.4	-108.8				18.64	17.94	16.63	16.88	4	1
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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	3.639	15 21 09.50375	+27 55 16.9900	230.289599	+27.921386	0.133	0.115	18.640	0.400	16.630	0.400	16.815	0.400	15.343	0.500	1980.5400	1980.5400	20.4	8.0	-108.8	7.6
2	5.459	15 21 09.80398	+27 55 16.8240	230.290850	+27.921340	0.103	0.103	18.530	0.400	17.750	0.400	17.926	0.400	17.256	0.500	1976.5500	1976.5500	-12.6	5.6	-13.5	5.6
3	6.393	15 21 09.02916	+27 55 21.3318	230.287621	+27.922592	0.005	0.005	13.025	0.300	13.938	0.300	15.308	0.080	14.222	0.110	2003.4700	2003.4700	-6.2	4.0	-3.1	4.0
4	6.645	15 21 09.92884	+27 55 17.0038	230.291370	+27.921390	0.025	0.036	20.530	0.400	19.741	0.202	19.365	0.090	18.378	0.118	2003.4700	2003.4700	40.3	7.2	3.3	7.2

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