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	3.941	13 17 20.50344	+27 55 41.5524	1125-06690408	199.335431	+27.928209			15.8	17.1	1955.287
2	5.995	13 17 20.57280	+27 55 43.4424	1125-06690422	199.335720	+27.928734			14.2	12.8	1955.287

%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	6.240	13 17 20.57736	+27 55 43.6800	EO1393-0281665	199.335739	+27.928800	14.04		1	12.35	20.1	0.08	14.04		1	12.56	21.0	0.00
[****ClosingBrace(s)Inserted****]
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%3cEM%3e1&%3cFONT%20COLOR=%27#CD5B45%27>%206.240&%3cFONT%20COLOR=%27#CD5B45%27>13%2017%2020.57736&%3cFONT%20COLOR=%27#CD5B45%27>%2b27%2055%2043.6800&EO1393-0281665&199.335739&%2b27.928800&14.04&%20&%201&%20%2012.35&%20%2020.1&%200.08&14.04&%20&%201&%20%2012.56&%20%2021.0&%20%200.00&%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	5.875	13 17 20.54088	+27 55 43.4244	N122233017405	199.335587	+27.928729	1982.387					3	4.34	0.18
2	6.534	13 17 20.63208	+27 55 43.7412	N12223308765	199.335967	+27.928817	1989.174	13.26	0.41	13.78	0.41	3	8.22	0.06

%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	4.570	13 17 20.39688	+27 55 42.2004	1179-0259992	199.334987	+27.928389	999	999	1979.9	0	0	3	16.46			16.17	17.75
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%3cEM%3e1&%3cFONT%20COLOR=%27#CD5B45%27>%204.570&%3cFONT%20COLOR=%27#CD5B45%27>13%2017%2020.39688&%3cFONT%20COLOR=%27#CD5B45%27>%2b27%2055%2042.2004&1179-0259992&199.334987&%2b27.928389&999&999&1979.9&%20%20%20%20%200&%20%20%20%20%200&3&16.46&%20&%20&16.17&17.75%3cBR%3e">\Ahref='VizieR-5?-ref=VIZ6641f2c53a4d3b&-out.add=.&-source=I/284/out&USNO-B1.0===1179-0259994&-out.orig=o' class='full'2 4.96213 17 20.56536+27 55 42.39121179-0259994199.335689+27.9284421826031975.0 22 22415.5517.06  14.2316.50 3 6.07913 17 20.59152+27 55 43.45321179-0259995199.335798+27.9287372051731978.6 0 0514.1212.3912.9712.0312.15 4 6.46013 17 20.45088+27 55 44.14081179-0259993199.335212+27.9289289997151976.8 0 0215.37      17.83 %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	4.570	13 17 20.396664	+27 55 42.20004	1179-0263451	..	199.3349861	+27.9283889	B	0.0	0.0	0.0	0.0	16.460	o			16.170	B
2	4.961	13 17 20.565336	+27 55 42.39012	1179-0263453	..	199.3356889	+27.9284417	B	22.0	5.0	22.0	18.0	15.550	o			14.230	B
3	6.075	13 17 20.591328	+27 55 43.44996	1179-0263454	..	199.3357972	+27.9287361	B	0.0	0.0	0.0	0.0	12.970	B			12.030	B
4	6.459	13 17 20.450664	+27 55 44.14008	1179-0263452	YM	199.3352111	+27.9289278	B	0.0	0.0	0.0	0.0	18.350	o					16.155	15.657	14.641

%0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20This%20version%20of%20the%20%0a%3cB%3eGSC-II%0ahas%20no%20proper%20motions,%20but%20the%20limits%20on%20brightness%20which%20existed%20on%0a%20%28F<18.5,%20B_j<19.5%29%20were%20removed.%0a%25The%20data%20are%20%3cB%3e%3cFONT%20COLOR=%27#0000CD%27>copyrighted,%20check%0a%25the%20%3cB%3edata%20use%20Policy.%0a%3cP%3e%0a

Full	_r arcsec	_RAJ2000 "h:m:s"	[****ClosingBrace(s)Inserted****]
">

%22h:m:s%22&%">\BegDIVclass='sort-down ' </A>string _DEJ2000
"d:m:s"GSC2.3

RAJ2000
degDEJ2000
degEpoch
yrFmag
magjmag
magVmag
magNmag
magClass

a
pixe

1 6.53913 17 20.63232+27 55 43.7448N5A4008765199.335968+27.9288181989.17413.2613.7815.7614.123 8.22 0.06 %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	4.995	13 17 20.32392	+27 55 42.3984	199.334683	+27.928444	-28.8	-14.9			16.46			16.17	17.75	3	1
2	6.374	13 17 20.55792	+27 55 43.8852	199.335658	+27.928857	11.8	52.0	16.155	14.641	15.55		17.06	14.23	16.50	5	1
3	6.407	13 17 20.56608	+27 55 43.8924	199.335692	+27.928859	-8.0	10.5	16.155	14.641	14.12	12.97	12.39	12.03	12.15	6	0
4	6.471	13 17 20.51064	+27 55 44.0976	199.335461	+27.928916	11.3	-1.7	16.155	14.641	15.37				17.83	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 [****ClosingBrace(s)Inserted****]
">

e_DEJ2000

%20

%22>%5cFONT SIZE=-1arcsecmagBJ
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 0.51913 17 20.44132+27 55 37.1688199.335172+27.926991 0.042 0.03320.945 0.20321.265 0.20720.826 0.12020.558 0.1422005.04002005.0400 0.0 0.0 0.0   2 6.19013 17 20.58895+27 55 43.5808199.335787+27.928772 0.022 0.01815.550 0.40014.230 0.40015.970 0.08015.086 0.1102005.04002005.0400 11.8 4.2 52.0 4.2 3 6.40613 17 20.56606+27 55 43.8920199.335692+27.928859 0.069 0.06913.783 0.30013.262 0.30013.385 0.40012.905 0.5001990.10001990.1000 -8.0 4.2 10.5 4.2 %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"	URAT1	RAICRS deg	DEICRS deg	Epoch yr	f.mag mag	e_ mag	pmRA mas/yr	pmDE mas/yr	Jmag mag	Hmag mag	Kmag mag	Bmag mag	Vmag mag	gmag mag	rmag mag	imag mag
1	6.437	13 17 20.560812	+27 55 43.99437	590-191635	199.3358423	+27.9288289	2013.659	16.850	0.034	40.1	-15.4	16.155	15.658	14.641

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