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	3.370	15 59 49.63608	-02 03 54.5328	0825-09037053	239.956817	-02.065148			19.3	17.5	1953.518
2	10.449	15 59 49.51200	-02 03 47.6100	0825-09037040	239.956300	-02.063225			18.6	17.8	1953.518

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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	6.384	15 59 49.59600	-02 03 51.4800	EO0761-0335350	239.956650	-02.064300	16.60		2	25.37	16.8	0.67	19.22		2	14.47	11.7	2.62	*
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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	1.011	15 59 49.73112	-02 03 56.4588	S22121334568	239.957213	-02.065683	1992.424	17.89	0.43			0	2.72	0.10
2	10.227	15 59 49.47072	-02 03 48.1032	S22121334591	239.956128	-02.063362	1992.424	18.15	0.43	19.37	0.42	3	2.88	0.19

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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	0.817	15 59 49.75152	-02 03 56.6028	0879-0383929	239.957298	-02.065723	80	126	1976.2	44	-38	5	20.54	17.37	20.76	18.31	14.92
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%3cEM%3e1&%3cFONT%20COLOR=%27#CD5B45%27>%200.817&%3cFONT%20COLOR=%27#CD5B45%27>15%2059%2049.75152&%3cFONT%20COLOR=%27#CD5B45%27>-02%2003%2056.6028&0879-0383929&239.957298&-02.065723&%2080&126&1976.2&%20%20%20%2044&%20%20%20-38&5&20.54&17.37&20.76&18.31&14.92%3cBR%3e">\Ahref='VizieR-5?-ref=VIZ6640a3b810cf16&-out.add=.&-source=I/284/out&USNO-B1.0===0879-0383928&-out.orig=o' class='full'2 1.45515 59 49.72488-02 03 56.02320879-0383928239.957187-02.065562 491141988.4 0 02    20.9217.94   310.32815 59 49.47672-02 03 47.95200879-0383926239.956153-02.063320107 731976.2 0 0519.5717.7119.8618.4017.65 418.17315 59 50.72952-02 03 46.67040879-0383937239.961373-02.0629641343041989.8 0 02    20.4519.56   521.44215 59 50.94816-02 03 45.66240879-0383939239.962284-02.0626846491241988.4 0 02    20.8719.70   %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	0.820	15 59 49.751328	-02 03 56.59992	0879-0385616	..	239.9572972	-02.0657222	B	44.0	2.0	-38.0	4.0	20.760	B			18.310	B
2	1.459	15 59 49.724664	-02 03 56.01996	0879-0385615	YM	239.9571861	-02.0655611	B	0.0	0.0	0.0	0.0	20.920	B	17.970	Y	17.940	B	13.384	12.826	12.467
3	10.330	15 59 49.476672	-02 03 47.94984	0879-0385613	..	239.9561528	-02.0633194	B	0.0	0.0	0.0	0.0	19.860	B			18.400	B
4	18.171	15 59 50.729328	-02 03 46.67004	0879-0385624	..	239.9613722	-02.0629639	B	0.0	0.0	0.0	0.0	20.450	B			19.560	B
5	21.441	15 59 50.947992	-02 03 45.65988	0879-0385626	..	239.9622833	-02.0626833	B	0.0	0.0	0.0	0.0	20.870	B			19.700	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	1.527	15 59 49.70136	-02 03 56.0952	S87Z004568	239.957089	-02.065582	1984.541	17.76	20.42		15.29	3	2.65	0.07
2	10.442	15 59 49.46832	-02 03 47.8836	S87Z004591	239.956118	-02.063301	1984.541	17.83	19.37		17.82	3	2.71	0.15
3	15.580	15 59 50.50752	-02 04 08.1192	S87Z004533	239.960448	-02.068922	1992.424	20.10				3	1.44	0.07
4	18.008	15 59 50.70384	-02 03 46.4328	S87Z012135	239.961266	-02.062898	1987.338		22.17			3	2.05	0.63

%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	0.786	15 59 49.74624	-02 03 56.6388	239.957276	-02.065733	36.7	-41.6	13.384	12.468	20.54	20.76	17.37		14.92	5	0
2	0.801	15 59 49.74576	-02 03 56.6244	239.957274	-02.065729	23.9	-42.4	13.384	12.468		20.92		17.94		3	0
3	10.382	15 59 49.45992	-02 03 48.0060	239.956083	-02.063335	-6.1	-4.8			19.57	19.86	17.71		17.65	4	0

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