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	0.244	16 51 13.72152	-50 21 48.8700	0375-29126965	252.807173	-50.363575			18.0	15.4	1979.927

%0a%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	0.167	16 51 13.72176	-50 21 48.9528	S230020310790	252.807174	-50.363598	1997.244	16.22	0.45	18.65	0.46	0	2.46	0.02
2	9.226	16 51 14.23080	-50 21 56.9844	S230020361871	252.809295	-50.365829	1991.611	17.34	0.55	19.25	0.47	3	1.63	0.28

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

">

%22> Full

">  _r
arcsec _RAJ2000
"h:m:s" _DEJ2000
"d:m:s"USNO-B1.0

RAJ2000
degDEJ2000
dege_RAJ2000
mase_DEJ2000
masEpoch
yrpmRA
mas/yrpmDE
mas/yrNdet

B1mag
magR1mag
magB2mag
magR2mag
magImag
mag 1 0.19916 51 13.74744-50 21 48.99240396-0559096252.807281-50.363609 72 931983.0 0 04  15.3416.3515.6514.00 2 7.14916 51 13.64472-50 21 56.20320396-0559093252.806853-50.3656129999991988.5 0 02  19.15  18.67   3 9.60216 51 14.28336-50 21 57.11040396-0559119252.809514-50.3658641091601983.8 0 03  17.9017.3918.25   %0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20More%20recent%20versions%20available:%20UCAC3%20%28I/315%29%20and%20UCAC4%20%28I/322%29;%20see%20also%20the%20UCAC%20home%20page%20at%20http://ad.usno.navy.mil/ucac/%3cP%3e%0a

Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	2UCAC	RAJ2000 deg	e_ mas	DEJ2000 deg	e_ mas	UCmag mag	No	Nc	pmRA mas/yr	pmDE mas/yr	2Mkey	Jmag mag	Kmag mag
1	0.059	16 51 13.735776	-50 21 49.08132	10253316	252.8072324	17	-50.3636337	15	15.98	2	2	-0.8	-16.6	603149326	12.260	10.975

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

Jmag

%20

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

Kmag
mag

R

1 0.05916 51 13.735728-50 21 49.080960396-0633865YM252.8072322-50.3636336C -0.7 6.0 -16.6 6.017.190Y16.040Y15.650B12.26011.30310.975R 2 7.14616 51 13.644672-50 21 56.199960396-0633862..252.8068528-50.3656111B 0.0 0.0 0.0 0.0        18.670B         3 9.60216 51 14.283336-50 21 57.110040396-0633889.M252.8095139-50.3658639B 0.0 0.0 0.0 0.017.390B    18.250B16.05315.38215.256   %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	0.172	16 51 13.72200	-50 21 48.9456	S8PV010790	252.807175	-50.363596	1997.244	16.22	18.65	16.42	14.27	0	2.46	0.02
2	9.221	16 51 14.23104	-50 21 56.9772	S8PV061871	252.809296	-50.365827	1991.611	17.34	19.25		16.97	3	1.63	0.28

%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

%20

%22> 1 0.15516 51 13.74192-50 21 48.9960252.807258-50.363610 -0.8 0.412.26010.975  16.3515.3415.6514.00 5 0 2 9.50416 51 14.27496-50 21 57.0456252.809479-50.365846 -1.3 2.216.05315.256  17.3917.9018.25   4 0 3 9.99816 51 12.69384-50 21 50.3964252.802891-50.363999 25.2 8.415.77714.768  16.8916.8317.06   4 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	0.170	16 51 13.74527	-50 21 49.0141	XPM 079-1149420	252.807272	-50.363615	3.00	-10.52	2.65	-13.00	16.221	18.648	16.424	14.268	12.260	0.025	11.303	0.025	10.975	0.023	603149326	18.0	15.4	227	19.533024	0	0	M
2	9.938	16 51 12.70054	-50 21 50.4179	XPM 079-1149360	252.802919	-50.364005	25.87	13.80	25.52	11.31	17.177	19.059		16.491	15.777	0.110	15.053	0.129	14.768	0.140	603149331	18.5	17.0	227	19.533024	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 "h:m:s"	[****ClosingBrace(s)Inserted****]
">

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

RAJ2000
deg

e_
mas

DEJ2000
deg

e_
mas

pmRA
mas/yr

e_
(...)

pmDE
mas/yr

e_
(...)

Epoch
yr

N1

N2

Nc

Bmag
mag

Vmag
mag

Jmag
mag

Hmag
mag

Kmag
mag

2M

igal

A

1 0.13616 51 13.739088-50 21 48.996722450123956252.8072462 43.7-50.3636102 44.1 -3.50 2.74 -10.34 2.851998.77 6 0 518.4316.6612.26011.30310.9752M0A %0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20%0a%25%25%25%20Introduction%20to%20UCAC4%20VizieR%20page%0a%3cEM%3e%25Note:%20%0a%20%20see%20the%20UCAC4%20document,%20and%20the%0a%20%20the%20fix%20for%20high%20proper%20motion%20stars.%0a%20%20The%20UCAC%20home%20page%20is%20available%20at%0a%20%20http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/ucac.%0a%20%20%3cBR%3ePlease%20%3cB%3eacknowledge%20the%20usage%0a%20%20of%20the%20UCAC4%0a%0a%25%3cP%3e%0a

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	0.165	16 51 13.741344	-50 21 48.97620	199-129384	252.8072556	-50.3636045	95	15.865	0	0	-2.8	-10.6	12.260	10.975					0	0	0	0	0	0	0	0	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