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	2.000	17 39 54.17616	+17 19 49.5624	1050-08979248	264.975734	+17.330434			19.1	18.6	1951.514
2	3.017	17 39 53.85072	+17 19 50.2320	1050-08979138	264.974378	+17.330620			15.5	13.9	1951.514

%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	bStel	bDiam arcsec	b-r mag	Mflag
1	3.314	17 39 53.85000	+17 19 50.8224	EO0274-0277584	264.974375	+17.330784	14.37		2	25.25	19.2	0.27	16.86		1	36.79	17.6	2.49
[****ClosingBrace(s)Inserted****]
">

%3cEM%3e1&%3cFONT%20COLOR=%27#CD5B45%27>%203.314&%3cFONT%20COLOR=%27#CD5B45%27>17%2039%2053.85000&%3cFONT%20COLOR=%27#CD5B45%27>%2b17%2019%2050.8224&EO0274-0277584&264.974375&%2b17.330784&14.37&%20&%202&%20%2025.25&%20%2019.2&%200.27&16.86&%20&%201&%20%2036.79&%20%2017.6&%20%202.49&%20%3cBR%3e">\EndTABLESORT

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	2.843	17 39 53.85744	+17 19 50.0124	N100101010122	264.974406	+17.330559	1992.487	13.53	0.17	16.00	0.42	3	8.01	0.17
2	8.815	17 39 53.93256	+17 19 57.6552	N100101010123	264.974719	+17.332682	1992.487	16.46	0.23			3	3.77	0.21

%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 mag
1	3.101	17 39 53.84400	+17 19 50.2212	1073-0346403	264.974350	+17.330617	72	124	1975.6	0	0	5	15.68	14.15	14.29	13.31	13.98
[****ClosingBrace(s)Inserted****]
">

%3cEM%3e1&%3cFONT%20COLOR=%27#CD5B45%27>%203.101&%3cFONT%20COLOR=%27#CD5B45%27>17%2039%2053.84400&%3cFONT%20COLOR=%27#CD5B45%27>%2b17%2019%2050.2212&1073-0346403&264.974350&%2b17.330617&%2072&124&1975.6&%20%20%20%20%200&%20%20%20%20%200&5&15.68&14.15&14.29&13.31&13.98%3cBR%3e">\Ahref='VizieR-5?-ref=VIZ664081c730362e&-out.add=.&-source=I/284/out&USNO-B1.0===1073-0346405&-out.orig=o' class='full'2 3.23117 39 53.89152+17 19 46.58161073-0346405264.974548+17.3296069999991972.4 0 02  17.25    18.19 3 7.07717 39 53.82288+17 19 55.32241073-0346402264.974262+17.3320349149991974.4 -98 126519.7719.0118.0712.9817.95 4 7.10817 39 53.88480+17 19 55.72201073-0346404264.974520+17.3321451754601974.6 0 0518.4318.0918.1816.4216.38 5 8.60817 39 53.53488+17 19 44.37121073-0346399264.973062+17.3289922578241968.9 0 02  19.29  19.71   6 9.28817 39 53.39472+17 19 49.46161073-0346394264.972478+17.3304062957151971.0 0 0220.53  20.28     %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	3.100	17 39 53.844000	+17 19 50.22012	1073-0349816	YM	264.9743500	+17.3306167	B	0.0	0.0	0.0	0.0	18.320	Y	17.590	Y	13.310	B	16.057	15.337	14.125
2	3.234	17 39 53.891328	+17 19 46.58016	1073-0349818	..	264.9745472	+17.3296056	B	0.0	0.0	0.0	0.0					17.250	e
3	7.076	17 39 53.822664	+17 19 55.31988	1073-0349815	..	264.9742611	+17.3320333	B	-98.0	28.0	126.0	63.0	18.070	B			12.980	B
4	7.107	17 39 53.884656	+17 19 55.71984	1073-0349817	..	264.9745194	+17.3321444	B	0.0	0.0	0.0	0.0	18.180	B			16.420	B
5	8.611	17 39 53.534664	+17 19 44.37012	1073-0349812	..	264.9730611	+17.3289917	B	0.0	0.0	0.0	0.0					19.710	B
6	9.289	17 39 53.394672	+17 19 49.46016	1073-0349807	..	264.9724778	+17.3304056	B	0.0	0.0	0.0	0.0	20.280	B

%0a%22>ts_init('!ext/nomad1.exe_5');

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	2.841	17 39 53.85768	+17 19 50.0160	N37O010122	264.974407	+17.330560	1992.487	13.53	16.00	16.81	14.54	3	8.01	0.17
2	8.818	17 39 53.93280	+17 19 57.6588	N37O010123	264.974720	+17.332683	1992.487	16.46	19.81		17.41	3	3.77	0.21

%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 [****ClosingBrace(s)Inserted****]
">

fl

%22> 1 3.13617 39 53.83608+17 19 50.0304264.974317+17.330564 -2.6 -5.516.05814.12515.6814.2914.1513.3113.98 6 0 2 3.32217 39 53.90760+17 19 46.2792264.974615+17.329522 28.0 -31.6        17.25  18.19 2 0 3 6.91917 39 53.88744+17 19 55.5348264.974531+17.332093 5.5 -19.8    18.4318.1818.0916.4216.38 5 1 4 7.92417 39 53.54736+17 19 45.4440264.973114+17.329290 9.0 20.4        19.2919.71   2 0 5 8.20417 39 53.79552+17 19 56.3844264.974148+17.332329 -101.5 144.0    19.7718.0719.0112.9817.95 5 1 6 9.63517 39 53.37528+17 19 50.2248264.972397+17.330618 -5.6 14.5    20.5320.28       2 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	3.137	17 39 53.83604	+17 19 50.0301	264.974317	+17.330564	0.064	0.064	16.004	0.300	13.533	0.300	13.571	0.400	11.861	0.500	1989.5000	1989.5000	-2.6	3.9	-5.5	3.9
2	6.919	17 39 53.88748	+17 19 55.5352	264.974531	+17.332093	0.103	0.103	18.180	0.400	16.420	0.400	16.646	0.400	15.318	0.500	1974.6900	1974.6900	5.5	5.4	-19.8	5.4
3	7.879	17 39 53.97120	+17 19 56.7948	264.974880	+17.332443	0.400	0.400	19.810	0.300	16.461	0.300	15.901	0.400	13.871	0.500	1992.4900	1992.4900	73.8	63.5	-114.5	37.3
4	8.203	17 39 53.79553	+17 19 56.3841	264.974148	+17.332329	0.115	0.115	18.070	0.400	12.980	0.400	9.579	0.400	7.600	0.500	1974.4900	1974.4900	-101.5	5.7	144.0	6.0

%0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20%3cP%3e%0a