The 3 columns in color are computed by VizieR, and are not part of the original data.

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	2.071	17 02 31.85208	+18 53 53.7108	1050-08312210	255.632717	+18.898253			19.5	19.3	1950.378
2	12.103	17 02 31.25400	+18 54 02.6820	1050-08312087	255.630225	+18.900745			18.7	18.2	1950.378
3	12.241	17 02 32.52288	+18 53 57.3720	1050-08312365	255.635512	+18.899270			19.9	19.2	1950.378
4	12.424	17 02 30.91872	+18 53 47.8824	1050-08312025	255.628828	+18.896634			19.3	19.4	1950.378
5	25.490	17 02 30.39552	+18 54 09.7128	1050-08311930	255.626648	+18.902698			18.9	18.4	1950.378

%0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20%3cB%3e%3cFONT%20COLOR=%27#CD5B45%27>%20The%20current%20version%20includes%20only%20the%20North%20%28POSS-I%20plates%29%3cP%3e%0a

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 [****ClosingBrace(s)Inserted****]
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bClass

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1 1.72317 02 31.80144+18 53 53.9916EO0122-0110490255.632506+18.89833120.00L 0      21.02  -1 -0.60 4.6 1.02   212.28417 02 31.23144+18 54 02.6820EO0122-0110343255.630131+18.90074518.17  -1 -0.31 6.8 0.0819.53  -1 0.35 7.8 1.36   312.42917 02 30.92280+18 53 47.7312EO0122-0110581255.628845+18.89659220.00L 0      20.67  -1 -1.27 5.0 0.67   425.78017 02 30.37872+18 54 09.8820EO0122-0110240255.626578+18.90274518.44  -1 -0.08 6.7 0.2519.86  -1 1.31 7.5 1.43   %0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20The%20construction%20of%20the%20%0a%3cB%3eGSC-II%20%0ais%20still%20in%20progress:%20this%0aversion%20has%20no%20proper%20motions,%20and%20the%20magnitude%20limits%20are%2018.5%20in%20F%20%28red%29%0aand%2019.5%20in%20J%20%28blue%29.%20The%20data%20are%20%3cB%3e%3cFONT%20COLOR=%27#0000CD%27>copyrighted,%20check%20%0athe%20%3cB%3edata%20use%20Policy.%0a%3cP%3e%0a

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	11.451	17 02 31.24776	+18 54 01.8216	N103312210572	255.630199	+18.900506	1996.446	18.05	0.43	19.19	0.42	3	3.13	0.18
2	12.447	17 02 30.92856	+18 53 47.5008	N103312210559	255.628869	+18.896528	1991.371			18.81	0.23	3	2.42	0.21
3	25.569	17 02 30.35688	+18 54 09.2088	N103312210582	255.626487	+18.902558	1996.446	18.13	0.43	18.23	0.20	0	3.05	0.05

%0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20The%20%3cB%3eUSNO-B%20Catalog%20presents%20positions,%20proper%20motions,%20%0amagnitudes%20un%20blue,%20red%20and%20infrared,%20as%20well%20as%20star/galaxy%20estimators%0afor%201,045,175,762%20objects%20derived%20from%203,648,832,040%20separate%20observations.%0aThe%20data%20were%20taken%20from%20scans%20of%207,435%20Schmidt%20plates%0ataken%20from%20various%20sky%20surveys%20during%20the%20last%2050%20years.%3cBR%3e%0aUSNO-B1.0%20catalog%20was%20created%20by%20Dave%20Monet%20and%20collaborators%0aat%20http://www.nofs.navy.mil/data/fchpix/%20%3cBR%3e%0a%3cB%3e%3cFONT%20COLOR=%27#EE0000%27>%20Note%20that%20the%20star/galaxy%20estimators%20may%20be%20mixed%20up%0a%20in%20dense%20regions.%0a%3cP%3e%0a

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 [****ClosingBrace(s)Inserted****]
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Imag

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%22>%5cFONT SIZE=-1mag 1 1.38517 02 31.80600+18 53 53.45161088-0263117255.632525+18.8981814281351971.4 0 0420.8320.0920.2220.51   211.57017 02 31.25088+18 54 02.00161089-0263807255.630212+18.900556 991191976.4 4 -12519.9018.5319.0518.0117.85 312.69317 02 30.90408+18 53 47.68081088-0263111255.628767+18.896578 831851971.4 0 0420.5020.1719.9420.78   412.83417 02 32.57544+18 53 57.10201088-0263126255.635731+18.8991952594131970.3 20 -4421.2719.9821.6520.06   512.83517 02 32.61408+18 53 55.19041088-0263127255.635892+18.8986649999991973.4 0 02  19.03  20.36   620.04517 02 31.30872+18 54 11.76121089-0263808255.630453+18.9032679999991973.4 0 02  20.35  20.88   725.75617 02 30.36408+18 54 09.61201089-0263801255.626517+18.902670106 331976.4 0 0519.9518.7219.7818.4618.02 %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	1.384	17 02 31.806000	+18 53 53.45016	1088-0267546	..	255.6325250	+18.8981806	B	0.0	0.0	0.0	0.0	20.220	B			20.510	B
2	11.570	17 02 31.250664	+18 54 02.00016	1089-0268189	..	255.6302111	+18.9005556	B	4.0	3.0	-12.0	3.0	19.050	B			18.010	B
3	12.694	17 02 30.904008	+18 53 47.68008	1088-0267540	..	255.6287667	+18.8965778	B	0.0	0.0	0.0	0.0	19.940	B			20.780	B
4	12.832	17 02 32.575344	+18 53 57.09984	1088-0267555	..	255.6357306	+18.8991944	B	20.0	7.0	-4.0	11.0	21.650	B			20.060	B
5	12.834	17 02 32.614008	+18 53 55.19004	1088-0267556	..	255.6358917	+18.8986639	B	0.0	0.0	0.0	0.0					20.360	B
6	20.044	17 02 31.308672	+18 54 11.76012	1089-0268190	..	255.6304528	+18.9032667	B	0.0	0.0	0.0	0.0					20.880	B
7	25.755	17 02 30.364008	+18 54 09.60984	1089-0268183	..	255.6265167	+18.9026694	B	0.0	0.0	0.0	0.0	19.780	B			18.460	B
[****ClosingBrace(s)Inserted****]
7	25.755	17 02 30.364008	+18 54 09.60984	1089-0268183	..	255.6265167	+18.9026694	B	0.0	0.0	0.0	0.0	19.780	B			18.460	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	0.656	17 02 31.76976	+18 53 52.9008	N3X6010566	255.632374	+18.898028	1996.446	19.58	20.14			3	2.72	0.40
2	11.452	17 02 31.24800	+18 54 01.8252	N3X6010572	255.630200	+18.900507	1996.446	18.05	19.19	19.20	17.57	3	3.13	0.18
3	11.981	17 02 32.51256	+18 53 57.0444	N3X6014148	255.635469	+18.899179	1996.446	19.55		19.38		3	2.31	0.20
4	12.690	17 02 30.90936	+18 53 47.5152	N3X6010559	255.628789	+18.896532	1996.446	19.84	20.18			3	1.94	0.13
5	16.902	17 02 31.41216	+18 54 08.9172	N3X6019116	255.630884	+18.902477	1996.446	20.08				3	1.96	0.37
6	25.572	17 02 30.35688	+18 54 09.2124	N3X6010582	255.626487	+18.902559	1996.446	18.13	19.62	18.85	17.50	0	3.05	0.05

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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 [****ClosingBrace(s)Inserted****]
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%27%29%22%20onMouseOut=%22laz%28%29%22>b2mag

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1 0.85617 02 31.77192+18 53 53.2068255.632383+18.898113 -10.4 -9.4    20.8320.2220.0920.51   4 0 211.49917 02 31.24680+18 54 01.8720255.630195+18.900520 1.1 -16.2    19.9019.0518.5318.0117.85 5 0 311.88717 02 32.49624+18 53 57.3576255.635401+18.899266 -36.9 42.2        19.0320.36   2 0 412.65117 02 32.56488+18 53 56.9796255.635687+18.899161 14.9 -10.6    21.2721.6519.9820.06   4 0 512.87717 02 30.89760+18 53 47.4288255.628740+18.896508 -3.7 -10.8    20.5019.9420.1720.78   4 0 619.61117 02 31.31208+18 54 11.3220255.630467+18.903145 27.8 -68.7        20.3520.88   2 0 725.79317 02 30.35112+18 54 09.4572255.626463+18.902627 -6.9 -4.5    19.9519.7818.7218.4618.02 5 0 %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	0.987	17 02 31.79363	+18 53 52.9451	255.632473	+18.898040	0.009	0.009	20.138	0.300	19.584	0.300	19.740	0.085	19.090	0.113	2003.3200	2003.3200	-10.4	5.4	-9.4	5.4
2	11.343	17 02 31.25845	+18 54 01.7989	255.630244	+18.900500	0.004	0.004	19.185	0.300	18.053	0.300	18.457	0.081	17.527	0.111	2003.3200	2003.3200	1.1	4.8	-16.2	4.8
3	12.315	17 02 32.54585	+18 53 56.7375	255.635608	+18.899094	0.027	0.028	21.775	0.207	19.546	0.300	20.449	0.103	19.288	0.127	2003.3200	2003.3200	-36.9	7.1	42.2	7.1
4	12.482	17 02 30.92640	+18 53 47.4819	255.628860	+18.896523	0.010	0.010	20.183	0.300	19.836	0.300	19.856	0.086	19.349	0.114	2003.3200	2003.3200	-3.7	5.4	-10.8	5.4
5	12.651	17 02 32.56485	+18 53 56.9800	255.635687	+18.899161	0.115	0.115	21.650	0.400	20.060	0.400	20.299	0.400	19.076	0.500	1970.3800	1970.3800	14.9	5.7	-10.6	5.7
6	25.634	17 02 30.36209	+18 54 09.3932	255.626509	+18.902609	0.004	0.004	19.615	0.300	18.126	0.300	18.663	0.081	17.607	0.111	2003.3200	2003.3200	-6.9	4.8	-4.5	4.8

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Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 [****ClosingBrace(s)Inserted****]
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Jmag
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111.19017 02 31.264601+18 54 01.67404545-210837255.6302692+18.90046502013.68618.424 0.021                     225.65617 02 30.357599+18 54 09.35310545-210831255.6264900+18.90259812013.84418.451 0.036                     %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"	RAICRS deg	e_ mas	DEICRS deg	e_ mas	ID	Type	pmRA mas/yr	e_ (...)	pmDE mas/yr	e_ (...)	Nobs	Dt yr	Rmag mag	Bmag mag	Nmag mag	Vmag mag	Jmag mag	Hmag mag	Kmag mag
1	0.967	17 02 31.787996	+18 53 53.07896	255.6324500	110.00	+18.8980775	96.00	54234+0010566	4	-3.0	4.2	-8.9	3.7	4	46.067	19.584	20.138
2	11.367	17 02 31.253557	+18 54 01.77811	255.6302232	37.00	+18.9004939	55.00	54234+0010572	4	3.7	1.5	-6.6	2.2	9	46.299	18.053	19.185	17.572	19.198
3	12.537	17 02 30.917130	+18 53 47.64587	255.6288214	76.00	+18.8965683	121.00	54234+0010559	4	-1.8	2.6	3.8	4.1	6	46.067	19.836	20.183
4	25.590	17 02 30.364723	+18 54 09.37005	255.6265197	35.00	+18.9026028	36.00	54234+0010582	0	-3.4	1.4	3.5	1.5	9	46.299	18.126	19.615	17.496	18.854

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