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	4.889	18 19 35.70336	+23 47 13.7616	1125-09309824	274.898764	+23.787156			13.1	11.2	1954.419
2	10.484	18 19 34.92336	+23 47 07.8108	1125-09309480	274.895514	+23.785503			16.7	14.8	1954.419
3	26.565	18 19 36.75480	+23 47 31.0020	1125-09310342	274.903145	+23.791945			18.6	17.3	1954.419
4	27.341	18 19 37.65672	+23 47 05.1720	1125-09310791	274.906903	+23.784770			18.8	17.2	1954.419
5	27.952	18 19 35.37000	+23 46 41.2608	1125-09309671	274.897375	+23.778128			19.9	18.4	1954.419
6	28.040	18 19 37.61136	+23 47 18.1428	1125-09310762	274.906714	+23.788373			19.3	18.6	1954.419
7	28.548	18 19 34.10208	+23 46 50.3328	1125-09309101	274.892092	+23.780648			19.3	18.2	1954.419

%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 [****ClosingBrace(s)Inserted****]
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rDiam

%22>%5cFONT SIZE=-1arcsecrEll

bmag
magl_

bClass

bStel

bDiam
arcsecb-r
magMflag

1 4.38418 19 35.53608+23 47 12.7716EO1089-0272697274.898067+23.786881 9.55   2 16.09 34.0 0.5312.32   2 20.31 33.6 2.77   226.67718 19 36.76200+23 47 31.0704EO1089-0272234274.903175+23.79196418.35   1 8.65 9.7 0.1919.92  -1 1.97 7.8 1.57   328.33018 19 34.10688+23 46 50.5920EO1089-0273236274.892112+23.78072019.36  -1 0.48 6.5 0.1121.15  -1 1.73 6.0 1.79   %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	5.048	18 19 35.68752	+23 47 13.9272	N02210137108	274.898698	+23.787202	1993.704	11.39	0.22	13.03	0.16	3	11.59	0.33
2	11.525	18 19 34.84776	+23 47 07.7244	N02210137109	274.895199	+23.785479	1993.704	15.34	0.22	16.54	0.16	3	4.17	0.07
3	26.181	18 19 36.73344	+23 47 30.7356	N02210137142	274.903056	+23.791871	1993.704	17.20	0.22	18.44	0.17	3	4.26	0.26
4	26.626	18 19 37.60272	+23 47 05.0388	N02210137100	274.906678	+23.784733	1993.704	17.21	0.22	19.09	0.17	3	3.58	0.16
5	28.987	18 19 34.08792	+23 46 49.8864	N02210136927	274.892033	+23.780524	1993.704	18.33	0.23			3	2.40	0.18

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

B1mag

%20

%22>%5cFONT SIZE=-1magR1mag
mag

B2mag
mag

R2mag
mag

Imag
mag

1 4.17418 19 35.38488+23 47 09.69001137-0286010274.897437+23.7860251826881981.1 -32 -10317.99    16.3415.76 2 4.90518 19 35.69400+23 47 13.78321137-0286013274.898725+23.787162 66 861977.2 0 0513.4911.1211.6510.5810.85 3 9.83418 19 34.96944+23 47 08.03041137-0286005274.895706+23.785564211 791977.2 18 4517.0114.9615.1614.1114.55 426.10118 19 36.71544+23 47 30.80041137-0286026274.902981+23.7918891461351977.2 0 0519.0017.4117.1816.4517.25 527.23018 19 37.65288+23 47 05.63281137-0286037274.906887+23.7848981912971977.2 0 0519.0217.3716.4216.1816.90 627.87218 19 37.60200+23 47 18.00241137-0286036274.906675+23.7883341641801977.2 0 0519.9618.9017.8018.3618.52 728.06518 19 35.35872+23 46 41.17081137-0286009274.897328+23.7781031801981977.2 0 0520.7418.8020.5719.4319.01 828.84018 19 34.08216+23 46 50.20321137-0285995274.892009+23.780612 541051977.2 0 0520.0218.4419.3518.3718.07 %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	4.177	18 19 35.384664	+23 47 09.69000	1137-0290653	..	274.8974361	+23.7860250	B	-32.0	6.0	-10.0	25.0	17.990	o			16.340	B
2	4.902	18 19 35.694000	+23 47 13.77996	1137-0290656	YM	274.8987250	+23.7871611	B	0.0	0.0	0.0	0.0	16.060	Y	15.060	Y	10.580	B	14.135	13.608	13.351
3	9.835	18 19 34.969344	+23 47 08.03004	1137-0290648	YM	274.8957056	+23.7855639	B	18.0	7.0	4.0	2.0	16.850	Y	16.330	Y	14.110	B	14.980	14.605	14.551
4	26.100	18 19 36.715344	+23 47 30.80004	1137-0290669	..	274.9029806	+23.7918889	B	0.0	0.0	0.0	0.0	17.180	B			16.450	B
5	27.227	18 19 37.652664	+23 47 05.62992	1137-0290680	.M	274.9068861	+23.7848972	B	0.0	0.0	0.0	0.0	16.420	B			16.180	B	16.344	15.964	15.330
6	27.871	18 19 37.602000	+23 47 17.99988	1137-0290679	..	274.9066750	+23.7883333	B	0.0	0.0	0.0	0.0	17.800	B			18.360	B
[****ClosingBrace(s)Inserted****]
6	27.871	18 19 37.602000	+23 47 17.99988	1137-0290679	..	274.9066750	+23.7883333	B	0.0	0.0	0.0	0.0	17.800	B			18.360	B

%22>\Ahref='VizieR-5?-ref=VIZ664050903d4546&-out.add=.&-source=I/297/out&NOMAD1===1137-0290652' class='full'728.06618 19 35.358672+23 46 41.170081137-0290652..274.8973278+23.7781028B 0.0 0.0 0.0 0.020.570B    19.430B         828.84418 19 34.081992+23 46 50.199961137-0290638..274.8920083+23.7806111B 0.0 0.0 0.0 0.019.350B    18.370B         %0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20Zone%20-30/%2b50deg%3cP%3e%0a

Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	CMC14	f_	RAICRS deg	DEICRS deg	r'mag mag	Nt	Jmag mag	Hmag mag	Ksmag mag
1	4.988	18 19 35.66544	+23 47 13.8624	181935.6+234713		274.898606	+23.787184	15.623	2	14.136	13.608	13.351
2	11.835	18 19 34.82568	+23 47 07.6452	181934.8+234707		274.895107	+23.785457	16.456	2	14.981	14.606	14.552

%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"	_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	5.048	18 19 35.68752	+23 47 13.9272	N213007108	274.898698	+23.787202	1993.704	11.39	13.03	13.34	11.67	3	11.59	0.33
2	11.522	18 19 34.84800	+23 47 07.7280	N213007109	274.895200	+23.785480	1993.704	15.34	16.54	16.27	15.14	3	4.17	0.07
3	18.692	18 19 36.78816	+23 46 57.9540	N213006961	274.903284	+23.782765	1993.704	20.17	21.31			3	1.43	0.22
[****ClosingBrace(s)Inserted****]
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%3cEM%3e3&%3cFONT%20COLOR=%27#CD5B45%27>18.692&%3cFONT%20COLOR=%27#CD5B45%27>18%2019%2036.78816&%3cFONT%20COLOR=%27#CD5B45%27>%2b23%2046%2057.9540&N213006961&274.903284&%2b23.782765&1993.704&20.17&21.31&%20&%20&3&%20%201.43&%200.22%3cBR%3e">\Ahref='VizieR-5?-ref=VIZ664050903d4546&-out.add=.&-source=I/305/out&GSC2.3===N213027618&-out.orig=o' class='full'420.23918 19 36.87528+23 47 20.7924N213027618274.903647+23.7891091993.70420.21      3 1.97 0.45 526.18318 19 36.73368+23 47 30.7356N213007142274.903057+23.7918711993.70417.2018.4418.1717.363 4.26 0.26 626.62918 19 37.60296+23 47 05.0388N213007100274.906679+23.7847331993.70417.2119.09  16.203 3.58 0.16 727.66518 19 37.58424+23 47 18.0708N213007101274.906601+23.7883531993.70418.5619.72  18.433 2.35 0.05 827.75218 19 35.89152+23 47 36.4848N213027648274.899548+23.7934681993.70419.78      3 2.60 0.50 928.38818 19 35.38296+23 46 40.7928N213006869274.897429+23.7779981993.70419.3420.4219.05  3 2.41 0.23 1028.98518 19 34.08792+23 46 49.8900N213006927274.892033+23.7805251993.70418.3319.5518.6817.863 2.40 0.18 %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	4.266	18 19 35.38080	+23 47 09.8664	274.897420	+23.786074	-37.4	-5.9			17.99			16.34	15.76	3	0
2	4.943	18 19 35.68488	+23 47 13.8228	274.898687	+23.787173	-5.7	0.0	14.136	13.351	13.49	11.65	11.12	10.58	10.85	6	0
3	11.377	18 19 34.85784	+23 47 07.8360	274.895241	+23.785510	-22.7	-1.2	14.981	14.552	17.01	15.16	14.96	14.11	14.55	6	1
4	25.869	18 19 36.70296	+23 47 30.6348	274.902929	+23.791843	-7.5	-7.5			19.00	17.18	17.41	16.45	17.25	5	0
5	27.057	18 19 37.63680	+23 47 05.2728	274.906820	+23.784798	-4.2	-8.5	16.345	15.330	19.02	16.42	17.37	16.18	16.90	6	0
6	27.842	18 19 37.60128	+23 47 17.9376	274.906672	+23.788316	-0.4	-3.8			19.96	17.80	18.90	18.36	18.52	5	0
7	28.144	18 19 35.36472	+23 46 41.0772	274.897353	+23.778077	4.5	-7.4			20.74	20.57	18.80	19.43	19.01	5	0
8	28.913	18 19 34.08216	+23 46 50.0916	274.892009	+23.780581	-2.5	-4.7			20.02	19.35	18.44	18.37	18.07	5	0

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>	\BegDIVclass='sort-down ' </A>
dec 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	11.678	18 19 34.83576	+23 47 07.8470	XPM 227-0416956	274.895149	+23.785513	-20.76	-0.40	-20.72	0.16	15.336	16.543	16.265	15.138	14.981	0.052	14.606	0.065	14.552	0.090	1038130964	16.7	14.8	391	45.795269	0	0	M
2	26.861	18 19 37.62074	+23 47 05.1072	XPM 227-0417006	274.906753	+23.784752	-4.98	-2.36	-4.94	-1.80	17.212	19.092		16.199	16.345	0.127	15.964	0.165	15.330	0.146	1038130963	18.8	17.2	391	45.795269	0	0	M

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Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	UCAC4	RAJ2000 deg	DEJ2000 deg	ePos mas	f.mag mag	of	db	pmRA mas/yr	pmDE mas/yr	Jmag mag	Kmag mag	Bmag mag	Vmag mag	rmag mag	imag mag	H	A	b	h	Z	B	L	N	S
1	5.452	18 19 35.720688	+23 47 14.30808	569-065345	274.8988362	+23.7873078	304	16.442	0	0	5.7	17.3	14.136	13.351					0	0	0	0	0	0	0	1	0
2	11.682	18 19 34.836936	+23 47 07.63512	569-065343	274.8951539	+23.7854542	205	16.348	0	0	-8.6	1.5	14.981	14.552					0	0	0	0	0	0	0	1	0

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