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	4.735	12 27 39.65136	+40 36 49.9608	1275-08091063	186.915214	+40.613878			15.2	15.6	1957.324

%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	5.293	12 27 39.61944	+40 36 49.5324	EO0115-0146917	186.915081	+40.613759	15.73		1	20.09	14.3	0.16	15.92		1	20.91	16.5	0.19
[****ClosingBrace(s)Inserted****]
">

%3cEM%3e1&%3cFONT%20COLOR=%27#CD5B45%27>%205.293&%3cFONT%20COLOR=%27#CD5B45%27>12%2027%2039.61944&%3cFONT%20COLOR=%27#CD5B45%27>%2b40%2036%2049.5324&EO0115-0146917&186.915081&%2b40.613759&15.73&%20&%201&%20%2020.09&%20%2014.3&%200.16&15.92&%20&%201&%20%2020.91&%20%2016.5&%20%200.19&%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	5.232	12 27 39.65328	+40 36 49.3668	N12200206128	186.915222	+40.613713	1990.012	15.46	0.42	15.68	0.42	3	6.34	0.12

%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	3.858	12 27 39.54216	+40 36 53.4528	1306-0227282	186.914759	+40.614848	265	999	1977.8	0	0	2	18.80				18.50
2	4.068	12 27 39.56616	+40 36 51.9516	1306-0227283	186.914859	+40.614431	45	125	1975.3	0	0	2	18.04		17.96
[****ClosingBrace(s)Inserted****]
">

%3cEM%3e2&%3cFONT%20COLOR=%27#CD5B45%27>%204.068&%3cFONT%20COLOR=%27#CD5B45%27>12%2027%2039.56616&%3cFONT%20COLOR=%27#CD5B45%27>%2b40%2036%2051.9516&1306-0227283&186.914859&%2b40.614431&%2045&125&1975.3&%20%20%20%20%200&%20%20%20%20%200&2&18.04&%20&17.96&%20&%20%3cBR%3e">\Ahref='VizieR-5?-ref=VIZ662a32d24ca93&-out.add=.&-source=I/284/out&USNO-B1.0===1306-0227285&-out.orig=o' class='full'3 4.73912 27 39.64272+40 36 50.02201306-0227285186.915178+40.6138951462101979.2 0 0515.2215.7114.9114.6616.19 4 5.68112 27 40.11408+40 36 48.92041306-0227287186.917142+40.6135899999991970.9 164 -86318.0618.99    18.41 5 6.36612 27 39.44472+40 36 49.91041306-0227281186.914353+40.6138649996191977.8 0 0218.27      18.34 %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	3.860	12 27 39.541992	+40 36 53.44992	1306-0230866	..	186.9147583	+40.6148472	B	0.0	0.0	0.0	0.0	18.800	o
2	4.070	12 27 39.565992	+40 36 51.95016	1306-0230867	..	186.9148583	+40.6144306	B	0.0	0.0	0.0	0.0	17.960	B
3	4.741	12 27 39.642672	+40 36 50.01984	1306-0230869	Y.	186.9151778	+40.6138944	B	0.0	0.0	0.0	0.0	17.550	Y	16.610	Y	14.660	B
4	5.681	12 27 40.114008	+40 36 48.92004	1306-0230871	..	186.9171417	+40.6135889	B	164.0	50.0	-86.0	35.0	18.060	o			18.990	e
5	6.367	12 27 39.444672	+40 36 49.91004	1306-0230865	..	186.9143528	+40.6138639	B	0.0	0.0	0.0	0.0	18.270	o

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

%3cEM%3e%20%3cFONT%20COLOR=%27#CD5B45%27>_r

%22>%5cFONT SIZE=-1arcsec _RAJ2000
"h:m:s" _DEJ2000
"d:m:s"GSC2.3

RAJ2000
degDEJ2000
degEpoch
yrFmag
magjmag
magVmag
magNmag
magClass

a
pixe

1 5.23212 27 39.65328+40 36 49.3668N554006128186.915222+40.6137131990.01215.4615.6816.7216.313 6.34 0.12 225.16612 27 41.71728+40 36 39.9672N554006112186.923822+40.6111021990.01220.38      3 1.54 0.42 %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	3.959	12 27 39.53424	+40 36 54.4932	186.914726	+40.615137	-10.5	16.4			18.80				18.50	2	0
2	4.286	12 27 39.55704	+40 36 51.6960	186.914821	+40.614360	-16.0	-16.8			18.04	17.96				2	0
3	4.896	12 27 39.62208	+40 36 49.9968	186.915092	+40.613888	-18.6	-10.6			15.22	14.91	15.71	14.66	16.19	5	0
4	5.912	12 27 40.10736	+40 36 48.6216	186.917114	+40.613506	161.7	-111.0			18.06		18.99		18.41	3	1
5	8.882	12 27 39.19704	+40 36 49.6044	186.913321	+40.613779	-80.6	-29.5			18.27				18.34	2	0

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

deg&%">\BegDIVclass='sort-down ' </A>dece_RAJ2000
(...)e_DEJ2000
arcsecmagBJ
mage_
magmagRF
mage_
magmagG
mage_
magmagGrvs
mage_
magalphaEpoch
yrdeltaEpoch
yrpmRA
mas/yre_
(...)pmDE
mas/yre_
(...) 1 2.23712 27 39.92432+40 36 51.7526186.916351+40.614376 0.027 0.02718.060 0.40018.990 0.40019.899 0.11818.887 0.1402003.31002003.3100 161.7 6.9 -111.0 6.9 2 2.37312 27 39.67506+40 36 54.4476186.915313+40.615124 0.050 0.04121.149 0.20421.073 0.20620.882 0.12820.535 0.1482003.31002003.3100 0.0 0.0 0.0   3 5.47112 27 39.66396+40 36 49.0322186.915267+40.613620 0.022 0.01615.675 0.30015.458 0.30016.977 0.08116.232 0.1102003.31002003.3100 -18.6 5.7 -10.6 5.7 %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	5.547	12 27 39.653463	+40 36 49.00791	654-217803	186.9152228	+40.6136133	2013.385	17.105	0.025

%0a%0a