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	2.769	17 27 25.11936	+22 44 27.7404	1125-08274009	261.854664	+22.741039			18.6	17.8	1951.506
2	5.475	17 27 25.41000	+22 44 22.1424	1125-08274086	261.855875	+22.739484			19.5	17.3	1951.506
3	7.375	17 27 24.99552	+22 44 21.6024	1125-08273982	261.854148	+22.739334			19.7	17.9	1951.506

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

b-r

%22>%5cFONT SIZE=-1magMflag

1 4.34717 27 25.22016+22 44 23.3412EO0263-0274307261.855084+22.73981716.22   2 38.32 11.5 0.1618.63   2 26.35 14.8 2.40   %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	2.707	17 27 25.12296	+22 44 27.4056	N10321205187	261.854679	+22.740946	1986.447	17.89	0.43	19.44	0.43	3	3.84	0.09
2	6.427	17 27 25.41720	+22 44 21.1884	N10321205185	261.855905	+22.739219	1986.447	17.67	0.43			0	3.04	0.09
3	8.270	17 27 24.98976	+22 44 20.5620	N10321205186	261.854124	+22.739045	1986.447	18.16	0.43			3	2.92	0.08

%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****]
">

Imag

%20

%22>%5cFONT SIZE=-1mag 1 2.52817 27 25.15680+22 44 26.29321127-0345102261.854820+22.7406371521141988.3 0 02    17.1416.54   2 2.77717 27 25.12200+22 44 28.03201127-0345101261.854675+22.741120 521831976.6 4 4519.2318.0718.8418.8717.99 3 5.54917 27 25.33080+22 44 21.92281127-0345103261.855545+22.7394231151391993.2 0 02    18.4917.39   4 5.99217 27 25.39152+22 44 21.56281127-0345104261.855798+22.739323 66 551976.6 -2 -12520.2817.6119.8218.9717.40 5 6.79017 27 25.06536+22 44 21.65281127-0345100261.854439+22.7393482752631991.0 0 03    18.0117.1317.45 6 7.92017 27 24.99000+22 44 20.98321127-0345099261.854125+22.7391622181431976.6 2 -14520.5318.2319.9919.3917.50 %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	2.531	17 27 25.156656	+22 44 26.28996	1127-0348328	..	261.8548194	+22.7406361	B	0.0	0.0	0.0	0.0	17.140	B			16.540	B
2	2.777	17 27 25.122000	+22 44 28.02984	1127-0348327	..	261.8546750	+22.7411194	B	4.0	1.0	4.0	5.0	18.840	B			18.870	B
3	5.552	17 27 25.330656	+22 44 21.91992	1127-0348329	YM	261.8555444	+22.7394222	B	0.0	0.0	0.0	0.0	18.350	Y			17.390	B	15.925	15.317	14.849
4	5.994	17 27 25.391328	+22 44 21.55992	1127-0348330	..	261.8557972	+22.7393222	B	-2.0	2.0	-12.0	1.0	19.820	B			18.970	B
5	6.792	17 27 25.065336	+22 44 21.64992	1127-0348326	..	261.8544389	+22.7393472	B	0.0	0.0	0.0	0.0	18.010	B			17.130	B
6	7.923	17 27 24.990000	+22 44 20.97996	1127-0348325	YM	261.8541250	+22.7391611	B	2.0	7.0	-14.0	4.0	19.990	B	17.970	Y	19.390	B	16.417	15.762	15.865
[****ClosingBrace(s)Inserted****]
6	7.923	17 27 24.990000	+22 44 20.97996	1127-0348325	YM	261.8541250	+22.7391611	B	2.0	7.0	-14.0	4.0	19.990	B	17.970	Y	19.390	B	16.417	15.762	15.865

%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	2.704	17 27 25.12320	+22 44 27.4056	N3VC005187	261.854680	+22.740946	1986.447	17.89	19.44	18.94	17.96	3	3.84	0.09
2	6.428	17 27 25.41744	+22 44 21.1884	N3VC005185	261.855906	+22.739219	1986.447	17.67	19.71	17.54	16.82	0	3.04	0.09
3	8.270	17 27 24.98976	+22 44 20.5620	N3VC005186	261.854124	+22.739045	1986.447	18.16	19.88		17.32	3	2.92	0.08

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

%27%29%22%20onMouseOut=%22laz%28%29%22>imag

%20

%22>%5cFONT SIZE=-1magNo

fl

1 2.75317 27 25.12272+22 44 27.9564261.854678+22.741099 3.2 2.6    19.2318.8418.0718.8717.99 5 0 2 6.15817 27 25.40568+22 44 21.4296261.855857+22.739286 1.1 -14.515.92514.84920.2819.8217.6118.9717.40 6 0 3 7.84917 27 24.99528+22 44 21.0192261.854147+22.739172 -86.5 -59.816.41715.865  18.01  17.1317.45 4 0 4 8.06617 27 24.98424+22 44 20.8608261.854101+22.739128 0.2 -17.216.41715.86520.5319.9918.2319.3917.50 6 0 %0a%0a

Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	ID	RAICRS deg	DEICRS deg	pmRAp mas/yr	pmDEp mas/yr	pmRAx mas/yr	pmDEx mas/yr	Fmag mag	Bjmag mag	Vmag mag	Nmag mag	Jmag mag	e_ mag	Hmag mag	e_ mag	Kmag mag	e_ mag	2Mkey	Bmag mag	Rmag mag	Fld	dT yr	fg	fs	M
1	6.142	17 27 25.41121	+22 44 21.4620	XPM 225-0365630	261.855880	+22.739295	-0.46	-17.35	-0.33	-16.92	17.668	19.711	17.544	16.815	15.925	0.074	15.318	0.087	14.849	0.125	1339365013	19.5	17.3	389	45.946243	0	0	M
2	8.090	17 27 24.98016	+22 44 20.8715	XPM 225-0365626	261.854084	+22.739131	-5.10	-18.36	-4.97	-17.94	18.161	19.883		17.320	16.417	0.120	15.763	0.128	15.865		1339365012	19.7	17.9	389	45.946243	0	0	M

%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 [****ClosingBrace(s)Inserted****]
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%3cEM%3e%20%3cFONT%20COLOR=%27#CD5B45%27>_RAJ2000

%20

%22>%5cFONT SIZE=-1"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 2.75317 27 25.12276+22 44 27.9560261.854678+22.741099 0.103 0.10319.439 0.30017.888 0.30018.129 0.40016.931 0.5001976.66001976.6600 3.2 5.0 2.6 5.0 2 6.15817 27 25.40565+22 44 21.4298261.855857+22.739286 0.071 0.07119.711 0.30017.668 0.30017.847 0.40016.355 0.5001987.66001987.6600 1.1 4.0 -14.5 4.0 3 7.84917 27 24.99527+22 44 21.0187261.854147+22.739172 0.115 0.11518.010 0.40017.130 0.40017.323 0.40016.581 0.5001992.66001992.6600 -86.5 25.5 -59.8 25.5 4 8.06517 27 24.98428+22 44 20.8612261.854101+22.739128 0.094 0.09419.883 0.30018.161 0.30018.391 0.40017.086 0.5001980.14001980.1400 0.2 4.6 -17.2 4.6 %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	6.316	17 27 25.409247	+22 44 21.45797	564-212674	261.8558604	+22.7392419	2013.179	17.496	0.043	-2.9	-14.2	15.925	15.318	14.849
2	8.466	17 27 24.977448	+22 44 20.84941	564-212672	261.8540242	+22.7390419	2013.207	17.937	0.056	-12.2	-22.6	16.417	15.763	15.865

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