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	6.340	20 39 46.22688	+16 19 10.6500	1050-18316959	309.942612	+16.319625			16.4	17.0	1951.514
2	8.270	20 39 46.27680	+16 19 12.6012	1050-18317000	309.942820	+16.320167			17.5	17.2	1951.514
3	9.197	20 39 45.41400	+16 19 11.9208	1050-18316366	309.939225	+16.319978			19.8	18.4	1951.514

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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	4.622	20 39 46.23048	+16 19 06.9528	N031312164345	309.942627	+16.318598	1990.628	18.20	0.42			0	2.01	0.12
2	5.635	20 39 46.16040	+16 19 10.5672	N031312140005	309.942335	+16.319602	1990.628	17.57	0.42	17.94	0.44	3	2.10	0.09
3	8.872	20 39 45.42072	+16 19 11.5140	N031312139964	309.939253	+16.319865	1990.628	17.93	0.42			3	2.02	0.06
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%3cEM%3e3&%3cFONT%20COLOR=%27#CD5B45%27>%208.872&%3cFONT%20COLOR=%27#CD5B45%27>20%2039%2045.42072&%3cFONT%20COLOR=%27#CD5B45%27>%2b16%2019%2011.5140&N031312139964&309.939253&%2b16.319865&1990.628&17.93&%200.42&%20&%20&3&%20%202.02&%200.06%3cBR%3e">\Ahref='VizieR-5?-ref=VIZ663c78932f6cd9&-out.add=.&-source=I/271/out&GSC2.2===N031312140004' class='full'4 9.96020 39 46.37184+16 19 13.6560N031312140004309.943216+16.3204601990.62818.28 0.42    3 1.97 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 mag
1	4.369	20 39 46.18536	+16 19 08.1408	1063-0564992	309.942439	+16.318928	160	236	1975.1	-14	-44	5	17.08	16.85	18.01	17.08	16.85
2	6.160	20 39 46.22208	+16 19 10.4628	1063-0564993	309.942592	+16.319573	312	125	1981.0	4	26	4	18.23		17.15	16.59	16.70
3	8.367	20 39 46.28880	+16 19 12.5832	1063-0564994	309.942870	+16.320162	168	45	1975.1	2	6	5	18.16	17.10	18.28	17.35	17.28
4	8.646	20 39 46.32072	+16 18 59.8320	1063-0564995	309.943003	+16.316620	403	399	1991.1	0	0	2			21.23		18.41
5	8.931	20 39 45.41280	+16 19 11.4600	1063-0564980	309.939220	+16.319850	64	88	1975.1	0	0	5	20.59	18.32	20.19	18.31	17.65

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

%22>%5cFONT SIZE=-1mas/yre_
(...)Bmag
magr_

Vmag
magr_

Rmag
magr_

Jmag
magHmag
magKmag
magR

1 4.36820 39 46.185336+16 19 08.140081063-0603140..309.9424389+16.3189278B -14.0 5.0 -44.0 7.018.010B    17.080B         2 6.15720 39 46.222008+16 19 10.459921063-0603141YM309.9425917+16.3195722B 4.0 12.0 26.0 4.017.840Y17.690Y16.590B16.81815.85615.707   3 8.36320 39 46.288656+16 19 12.579961063-0603142..309.9428694+16.3201611B 2.0 5.0 6.0 1.018.280B    17.350B         4 8.64720 39 46.320672+16 18 59.829841063-0603143..309.9430028+16.3166194B 0.0 0.0 0.0 0.021.230B                 5 8.93320 39 45.412656+16 19 11.460001063-0603128.M309.9392194+16.3198500B 0.0 0.0 0.0 0.020.190B    18.310B16.68716.15515.644   %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	4.623	20 39 46.23048	+16 19 06.9564	N2QH064345	309.942627	+16.318599	1990.628	18.20				0	2.01	0.12
2	5.637	20 39 46.16064	+16 19 10.5672	N2QH040005	309.942336	+16.319602	1990.628	17.57	17.94	16.93	16.74	3	2.10	0.09
3	8.755	20 39 46.34784	+16 19 00.0588	N2QH064318	309.943116	+16.316683	1990.628	19.67				3	1.88	0.36
4	8.871	20 39 45.42096	+16 19 11.5176	N2QH039964	309.939254	+16.319866	1990.628	17.93	20.34	18.64	17.35	3	2.02	0.06
5	9.962	20 39 46.37208	+16 19 13.6560	N2QH040004	309.943217	+16.320460	1990.628	18.28	19.91		18.06	0	1.97	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 [****ClosingBrace(s)Inserted****]
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%27%29%22%20onMouseOut=%22laz%28%29%22>r1mag

%20

%22>%5cFONT SIZE=-1magr2mag
mag

imag
mag

No

fl

1 4.25020 39 46.18080+16 19 08.0040309.942420+16.318890 -14.4 -51.5    17.0818.0116.8517.0816.85 5 0 2 6.01920 39 46.19976+16 19 10.5816309.942499+16.319606 -4.7 27.816.81915.70718.2317.15  16.5916.70 5 0 3 8.14220 39 46.28112+16 19 12.3816309.942838+16.320106 0.2 -0.9    18.1618.2817.1017.3517.28 5 0 4 8.83620 39 45.41184+16 19 11.2764309.939216+16.319799 0.2 -8.916.68815.64420.5920.1918.3218.3117.65 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	6.114	20 39 46.18057	+16 19 10.9488	XPM 212-0863280	309.942419	+16.319708	-13.77	14.75	-13.46	15.00	17.570	17.938	16.925	16.740	16.819	0.141	15.857		15.707	0.223	1235777519	16.4	17.0	456	46.009411	0	0	M
2	8.815	20 39 45.41594	+16 19 11.3234	XPM 212-0863252	309.939233	+16.319812	0.43	-3.94	0.74	-3.69	17.932	20.339	18.636	17.352	16.688	0.127	16.156	0.166	15.644	0.239	1235777521	19.8	18.4	456	46.009411	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
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e_
mag

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mag

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mag

alphaEpoch
yr

deltaEpoch
yr

pmRA
mas/yr

e_
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pmDE
mas/yr

e_
(...)

1 4.25020 39 46.18080+16 19 08.0039309.942420+16.318890 0.103 0.10318.010 0.40018.196 0.30018.125 0.40018.188 0.5001975.17001975.1700 -14.4 5.3 -51.5 5.3 2 6.01920 39 46.19974+16 19 10.5818309.942499+16.319606 0.100 0.10017.938 0.30017.570 0.30017.655 0.40017.291 0.5001984.98001984.9800 -4.7 6.1 27.8 6.1 3 8.14220 39 46.28117+16 19 12.3821309.942838+16.320106 0.103 0.10319.909 0.30018.281 0.30018.518 0.40017.271 0.5001975.17001975.1700 0.2 5.3 -0.9 5.3 4 8.83520 39 45.41187+16 19 11.2762309.939216+16.319799 0.091 0.09120.339 0.30017.932 0.30017.997 0.40016.317 0.5001980.00001980.0000 0.2 4.7 -8.9 4.7 %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	4.501	20 39 46.225462	+16 19 06.54200	532-585493	309.9426061	+16.3184839	2013.656	17.901	0.122
2	5.340	20 39 46.177322	+16 19 10.80863	532-585492	309.9422997	+16.3195239	2013.437	17.497	0.021	-27.2	-38.9	16.819	15.857	15.707
3	8.859	20 39 45.414189	+16 19 11.31954	532-585475	309.9392101	+16.3198019	2013.587	18.474	0.027	-4.0	-2.4	16.688	16.156	15.644
4	9.553	20 39 46.359444	+16 19 13.26898	532-585495	309.9431643	+16.3203525	2013.598	17.979	0.032

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Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	RA_ICRS deg	e_ mas	DE_ICRS deg	e_ mas	Source	Plx mas	pmRA [****ClosingBrace(s)Inserted****]
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%20

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RADEcor

Dup

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mag

Var

1 4.43520 39 46.221118198+16 19 06.50021496309.942587992510.365+16.318472281914.9681810916610391010944       0.9760 4.7868e+02 2.5219e+0018.825NOT_AVAILABLE 2 5.31520 39 46.151007301+16 19 10.26418023309.942295863810.840+16.319517827815.6471810916644748941440       0.9760 9.1963e+02 1.2414e+0118.116NOT_AVAILABLE 3 8.79320 39 45.411687295+16 19 11.19850433309.939215363710.476+16.319777362315.1211810916610389197824       0.9760 6.8187e+02 3.1128e+0018.441NOT_AVAILABLE 4 9.13220 39 46.350614630+16 18 59.56991624309.943127561015.029+16.316547199021.6891810916614683792384       0.9740 1.4454e+02 2.4989e+0020.125NOT_AVAILABLE 5 9.48320 39 46.353604723+16 19 13.25141774309.9431400197 9.989+16.320347616014.4261810916644748941312       0.9760 5.1531e+02 2.6172e+0018.745NOT_AVAILABLE %0a%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	ipix	comp	pmRA mas/yr	pmDE mas/yr	Jmag mag	Hmag mag	Kmag mag	B1mag mag	B2mag mag	R1mag mag	R2mag mag	Imag mag	GaiaId	Gmag mag	Clone	Nosc
1	5.426	20 39 46.172852616	+16 19 10.13223612	309.9423868859	+16.3194811767	5612710839885481411		-20.852	9.070	16.819	15.857	15.707	18.23	17.15		16.59	16.70	1810916644748941440	18.116
2	8.860	20 39 45.411612840	+16 19 11.31348468	309.9392150535	+16.3198093013	5612710838366206504		0.072	-7.689	16.688	16.156	15.644	20.59	20.19	18.32	18.31	17.65	1810916610389197824	18.441

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