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	3.875	10 40 37.72488	+41 45 04.7124	1275-07770824	160.157187	+41.751309			15.4	14.2	1953.181

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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	3.745	10 40 37.72152	+41 45 04.5216	EO0690-0136668	160.157173	+41.751256	13.79		2	26.36	23.0	0.47	15.42		1	36.75	25.5	1.63
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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	2.962	10 40 37.76304	+41 45 03.8916	N23233023529	160.157346	+41.751081	1998.373	14.38	0.30	15.36	0.32	3	7.84	0.48

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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	3.721	10 40 37.72752	+41 45 04.5432	1317-0229459	160.157198	+41.751262	90	117	1981.8	0	0	4	15.53		14.36	14.15	13.58
2	3.866	10 40 37.78416	+41 45 05.0832	1317-0229460	160.157434	+41.751412	172	358	1979.5	24	14	5	15.96	14.41	14.28	13.50	15.72
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%3cEM%3e2&%3cFONT%20COLOR=%27#CD5B45%27>%203.866&%3cFONT%20COLOR=%27#CD5B45%27>10%2040%2037.78416&%3cFONT%20COLOR=%27#CD5B45%27>%2b41%2045%2005.0832&1317-0229460&160.157434&%2b41.751412&172&358&1979.5&%20%20%20%2024&%20%20%20%2014&5&15.96&14.41&14.28&13.50&15.72%3cBR%3e">\Ahref='VizieR-5?-ref=VIZ663af094158a1c&-out.add=.&-source=I/284/out&USNO-B1.0===1317-0229457&-out.orig=o' class='full'3 4.29110 40 37.60080+41 45 03.83041317-0229457160.156670+41.7510646223391971.6 0 0216.55  13.74     4 7.44310 40 38.40936+41 45 06.67081317-0229466160.160039+41.7518539999991978.1 0 0317.58  21.2320.40   5 8.94710 40 37.13736+41 45 00.09001317-0229455160.154739+41.7500256049991972.1 0 0220.11      18.70 6 9.93310 40 38.50872+41 45 09.05041317-0229467160.160453+41.7525142166891972.1 0 0221.09      18.46 %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	3.720	10 40 37.727328	+41 45 04.53996	1317-0233123	..	160.1571972	+41.7512611	B	0.0	0.0	0.0	0.0	14.360	B			14.150	B
2	3.864	10 40 37.783992	+41 45 05.07996	1317-0233124	..	160.1574333	+41.7514111	B	24.0	5.0	14.0	12.0	14.280	B			13.500	B
3	4.292	10 40 37.600656	+41 45 03.83004	1317-0233121	YM	160.1566694	+41.7510639	B	0.0	0.0	0.0	0.0	18.350	Y					15.384	14.779	14.295
4	7.442	10 40 38.409336	+41 45 06.67008	1317-0233130	..	160.1600389	+41.7518528	B	0.0	0.0	0.0	0.0	21.230	B			20.400	B
5	8.947	10 40 37.137336	+41 45 00.09000	1317-0233119	..	160.1547389	+41.7500250	B	0.0	0.0	0.0	0.0	20.110	o
6	9.932	10 40 38.508672	+41 45 09.05004	1317-0233131	..	160.1604528	+41.7525139	B	0.0	0.0	0.0	0.0	21.090	o

%0a%0a%3cP%3e%0a%0a%5b%2a%2a%2a%2aClosingBrace%28s%29Inserted%2a%2a%2a%2a%5d

">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. %The data are copyrighted, check %the data use Policy.

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	2.960	10 40 37.76328	+41 45 03.8916	N99U003529	160.157347	+41.751081	1998.373	14.38	15.36	16.20	13.91	3	7.84	0.48

%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	3.377	10 40 37.75008	+41 45 04.3020	160.157292	+41.751195	13.2	-5.2	15.384	14.296	15.96	14.28	14.41	13.50	15.72	6	0
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%3cEM%3e1&%3cFONT%20COLOR=%27#CD5B45%27>%203.377&%3cFONT%20COLOR=%27#CD5B45%27>10%2040%2037.75008&%3cFONT%20COLOR=%27#CD5B45%27>%2b41%2045%2004.3020&160.157292&%2b41.751195&%20%20%20%2013.2&%20%20%20%20-5.2&15.384&14.296&15.96&14.28&14.41&13.50&15.72&%206&%200%3cBR%3e">\Ahref='VizieR-5?-ref=VIZ663af094158a1c&-out.add=.&-source=I/317/sample&PPMXL===4303250636216916656' class='full'2 3.38910 40 37.73064+41 45 04.1472160.157211+41.751152 43.7 7.415.38414.29616.5513.74       3 1 3 3.40010 40 37.73616+41 45 04.2120160.157234+41.751170 2.2 -11.915.38414.29615.5314.36  14.1513.58 5 0 4 9.53310 40 38.48832+41 45 08.7192160.160368+41.752422 -9.2 -23.0    21.09      18.46 2 0 5 9.74110 40 37.07376+41 44 59.5788160.154474+41.749883 -20.0 -42.1    20.11      18.70 2 0 6 9.85610 40 38.54736+41 45 08.5428160.160614+41.752373 154.9 39.4    17.5821.23  20.40   3 1 %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	3.378	10 40 37.75005	+41 45 04.3018	160.157292	+41.751195	0.066	0.069	15.362	0.300	14.380	0.300	14.589	0.400	13.773	0.500	1991.2700	1991.2700	13.2	3.9	-5.2	3.9
2	3.400	10 40 37.73615	+41 45 04.2121	160.157234	+41.751170	0.069	0.069	14.360	0.400	14.150	0.400	14.193	0.400	13.950	0.500	1993.5100	1993.5100	2.2	5.2	-11.9	5.2
3	3.696	10 40 37.70205	+41 45 04.2744	160.157092	+41.751187	0.014	0.010	13.740	0.400	16.554	0.200	16.132	0.080	15.016	0.110	2003.2200	2003.2200	43.7	5.2	7.4	5.2
4	9.856	10 40 38.54736	+41 45 08.5432	160.160614	+41.752373	0.133	0.163	21.230	0.400	20.400	0.400	20.585	0.400	19.879	0.500	1978.1700	1978.1700	154.9	7.5	39.4	8.2

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