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	17.579	16 50 59.56344	+01 19 47.4312	0900-09022467	252.748181	+01.329842			18.6	17.4	1950.463
2	21.713	16 51 00.20280	+01 20 24.0612	0900-09022644	252.750845	+01.340017			17.9	17.6	1950.463
3	24.016	16 51 01.04736	+01 20 11.7420	0900-09022872	252.754364	+01.336595			15.7	14.8	1950.463
4	25.299	16 50 58.09608	+01 19 51.2004	0900-09022025	252.742067	+01.330889			17.5	16.5	1950.463

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Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	GSC	RAJ2000 deg	DEJ2000 deg	PosErr arcsec	Pmag mag	e_ mag	n_	Class	Plate	Epoch yr
1	23.62	16 51 01.0272	+01 20 11.364	0038401555	252.75428	+01.33649	0.3	14.97	0.41	0	0	00JM	1980.591

%0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20The%20%3cB%3eGSC-ACT%20%3cEM%3e%28or%20%3cB%3eGSC1.3%29%0ais%20a%20recalibration%20of%20the%20%3cB%3e<%25E%20I/220%7cGSC1.1>,%20the%20catalogue%20constructed%20%0ato%20support%20the%20operational%20need%20of%20the%20Hubble%20Space%20Telescope,%0awith%20the%20%3cB%3e<%25E%20I/246%7cACT>,%20the%20combination%20of%20the%20Astrographic%20Catalogue%0aand%20the%20%3cB%3e%3cEM%3eTycho%20catalogue%20derived%20from%20the%20%3cEM%3e<%25E%20I/239%7cHipparcos>%0amission;%20see%20http://www.projectpluto.com/gsc_act.htm%20for%20more%20details%0aabout%20this%20recalibration.%0a%3cP%3e%0a%22>

>	\BegDIVclass='sort-down ' </A>
dec Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	GSC	RAJ2000 deg	DEJ2000 deg	PosErr arcsec	Pmag mag	e_ mag	n_	Class	Epoch yr
1	23.77	16 51 01.0344	+01 20 11.544	0038401555	252.75431	+01.33654	0.3	14.99	0.43	0	0	1980.591

Note: The current version includes only the North (POSS-I plates)

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	3.121	16 50 59.47608	+01 20 08.0700	EO0155-0129068	252.747817	+01.335575	20.00	L	0				20.89		1	4.89	5.7	0.89
2	17.314	16 50 59.55480	+01 19 47.6904	EO0155-0129570	252.748145	+01.329914	17.46		-1	-0.83	7.4	0.02	19.42		-1	-0.07	5.9	1.96
3	21.914	16 51 00.20400	+01 20 24.2808	EO0155-0128673	252.750850	+01.340078	17.58		-1	-0.71	7.4	0.07	18.53		-1	0.41	7.5	0.96
4	23.995	16 51 01.04352	+01 20 11.8608	EO0155-0128981	252.754348	+01.336628	14.65		-1	-0.76	11.5	0.05	15.79		-1	-0.29	10.8	1.13
5	29.894	16 50 57.76488	+01 19 50.5524	EO0155-0129499	252.740687	+01.330709	13.94		2	9.47	20.7	0.60	15.98		2	11.31	19.4	2.04

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Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	GSC2.2	RA(ICRS) deg	DE(ICRS) [****ClosingBrace(s)Inserted****]
">

DE%28ICRS%29

%22>%5cFONT SIZE=-1degEpoch
yrRmag
mage_
magBjmag
mage_
magClass

a
pixe

118.50516 50 59.57088+01 19 46.5096N100201314121252.748212+01.3295861994.36317.60 0.4119.24 0.420 2.65 0.04 221.42616 51 00.20376+01 20 23.7264N100201314307252.750849+01.3399241994.36317.48 0.4118.68 0.423 3.69 0.31 323.84016 51 01.04208+01 20 11.3784N1002013124252.754342+01.3364941994.36314.45 0.4115.71 0.410 4.07 0.03 425.66016 50 58.09200+01 19 50.6388N100201314146252.742050+01.3307331994.36316.43 0.4117.89 0.410 3.07 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 mag
1	2.917	16 50 59.43336	+01 20 07.6704	0913-0273450	252.747639	+01.335464	389	999	1970.4	0	0	2	19.85		20.59
2	11.504	16 50 59.59752	+01 20 16.4220	0913-0273454	252.748323	+01.337895	853	405	1981.2	-400	10	4	19.79		20.55	19.40	18.94
3	18.383	16 50 59.57136	+01 19 46.6320	0913-0273452	252.748214	+01.329620	151	55	1975.0	4	-12	5	18.85	17.19	19.51	17.51	17.41
4	21.515	16 51 00.20208	+01 20 23.8416	0913-0273461	252.750842	+01.339956	68	49	1975.0	0	0	5	17.95	17.47	18.99	17.83	17.71
5	22.998	16 51 00.40800	+01 20 23.6400	0913-0273462	252.751700	+01.339900	959	355	1992.9	0	0	2				19.31	18.81
6	24.075	16 51 01.05336	+01 20 11.6412	0913-0273466	252.754389	+01.336567	72	52	1975.0	2	4	5	15.27	14.29	15.89	14.37	14.13
7	25.626	16 50 58.08480	+01 19 50.8620	0913-0273439	252.742020	+01.330795	91	67	1974.8	0	0	5	17.40	16.27	18.09	16.00	15.73

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Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	2UCAC	RAJ2000 deg	e_ mas	DEJ2000 [****ClosingBrace(s)Inserted****]
">

DEJ2000

%20

%22>%5cFONT SIZE=-1dege_
mas

UCmag
mag

No

Nc

pmRA
mas/yr

pmDE
mas/yr

2Mkey

Jmag
mag

Kmag
mag

123.85216 51 01.038864+01 20 11.5911632222647252.7543286 23+01.3365531 3114.67 3 2 -6.0 -10.0110846184513.62813.161 %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	2.917	16 50 59.433336	+01 20 07.67004	0913-0278014	..	252.7476389	+01.3354639	B	0.0	0.0	0.0	0.0	20.590	B
2	11.502	16 50 59.597328	+01 20 16.41984	0913-0278018	..	252.7483222	+01.3378944	B	-400.0	33.0	10.0	15.0	20.550	B			19.400	B
3	18.385	16 50 59.571336	+01 19 46.62984	0913-0278016	YM	252.7482139	+01.3296194	B	4.0	4.0	-12.0	1.0	18.260	Y	17.280	Y	17.510	B	16.245	15.458	15.468
4	21.513	16 51 00.202008	+01 20 23.84016	0913-0278025	..	252.7508417	+01.3399556	B	0.0	0.0	0.0	0.0	18.990	B			17.830	B
5	22.998	16 51 00.408000	+01 20 23.64000	0913-0278026	..	252.7517000	+01.3399000	B	0.0	0.0	0.0	0.0					19.310	B
6	23.852	16 51 01.038864	+01 20 11.59116	0913-0278029	YM	252.7543286	+01.3365531	C	-5.9	5.6	-10.0	5.6	17.800	Y	17.610	Y	14.370	B	13.628	13.265	13.161
[****ClosingBrace(s)Inserted****]
6	23.852	16 51 01.038864	+01 20 11.59116	0913-0278029	YM	252.7543286	+01.3365531	C	-5.9	5.6	-10.0	5.6	17.800	Y	17.610	Y	14.370	B	13.628	13.265	13.161

%22>\Ahref='VizieR-5?-ref=VIZ6643858e2c066a&-out.add=.&-source=I/297/out&NOMAD1===0913-0278003' class='full'725.62916 50 58.084656+01 19 50.859840913-0278003YM252.7420194+01.3307944B 0.0 0.0 0.0 0.016.230Y16.580Y16.000B15.38114.89414.820   %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	23.746	16 51 01.03248	+01 20 11.5404	165101.0+012011		252.754302	+01.336539	14.795	5	13.628	13.265	13.161
2	25.540	16 50 58.09776	+01 19 50.7252	165058.0+011950		252.742074	+01.330757	16.804	5	15.381	14.895

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