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	5.712	18 20 26.80344	+33 26 19.4712	1200-09163365	275.111681	+33.438742			18.7	17.0	1950.602
2	8.339	18 20 27.79608	+33 26 25.9908	1200-09163654	275.115817	+33.440553			19.1	18.4	1950.602

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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	5.655	18 20 26.80488	+33 26 19.5720	EO0197-0431938	275.111687	+33.438770	17.56		-1	-1.27	9.8	0.10	20.01		-1	1.23	7.1	2.45
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%3cEM%3e1&%3cFONT%20COLOR=%27#CD5B45%27>%205.655&%3cFONT%20COLOR=%27#CD5B45%27>18%2020%2026.80488&%3cFONT%20COLOR=%27#CD5B45%27>%2b33%2026%2019.5720&EO0197-0431938&275.111687&%2b33.438770&17.56&%20&-1&%20%20-1.27&%20%20%209.8&%200.10&20.01&%20&-1&%20%20%201.23&%20%20%207.1&%20%202.45&%20%3cBR%3e">\Ahref='VizieR-5?-ref=VIZ662c59a03c78a&-out.add=.&-source=I/267/out&APM-ID===EO0197-0431792&-out.orig=o' class='full'2 7.97318 20 27.76872+33 26 25.8504EO0197-0431792275.115703+33.44051418.40  -1 -1.16 7.8 0.0120.24  -1 0.09 6.9 1.83   %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	5.349	18 20 26.81832	+33 26 19.9788	N02232214097	275.111743	+33.438883	1993.486	17.17	0.42	19.06	0.42	3	2.75	0.03
2	8.044	18 20 27.77088	+33 26 25.9440	N02232214118	275.115712	+33.440540	1993.486	18.19	0.42			3	2.50	0.08

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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	5.334	18 20 26.81088	+33 26 20.3100	1234-0298922	275.111712	+33.438975	152	95	1975.9	4	18	5	18.26	16.67	19.28	17.21	16.11
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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	5.337	18 20 26.810664	+33 26 20.31000	1234-0303499	YM	275.1117111	+33.4389750	B	4.0	4.0	18.0	3.0	18.350	Y	17.390	Y	17.210	B	15.305	14.532	14.332
2	7.994	18 20 27.757992	+33 26 26.10996	1234-0303509	YM	275.1156583	+33.4405861	B	-6.0	3.0	2.0	1.0	18.350	Y			18.280	B	17.286	16.297	17.407

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Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	CMC14	f_	RAICRS deg	DEICRS [****ClosingBrace(s)Inserted****]
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DEICRS

%22>%5cFONT SIZE=-1degr'mag
magNt

Jmag
magHmag
magKsmag
mag 1 5.25718 20 26.82168+33 26 20.1372182026.8+332620  275.111757+33.43892717.303 215.30614.53214.332 %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	5.347	18 20 26.81832	+33 26 19.9824	N25L004097	275.111743	+33.438884	1993.486	17.17	19.06	17.94	15.80	3	2.75	0.03
2	8.044	18 20 27.77088	+33 26 25.9440	N25L004118	275.115712	+33.440540	1993.486	18.19	19.52	18.85	17.47	3	2.50	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 mag	r2mag mag	imag mag	No	fl [****ClosingBrace(s)Inserted****]
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fl

%20

%22> 1 5.42018 20 26.81112+33 26 20.0184275.111713+33.438894 1.5 13.415.30614.33218.2619.2816.6717.2116.11 6 0 2 7.87418 20 27.75696+33 26 25.9044275.115654+33.440529 -8.8 0.317.28617.40718.6719.5318.3118.2817.86 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	5.390	18 20 26.81402	+33 26 20.0078	XPM 246-0418098	275.111725	+33.438891	4.82	10.25	5.13	10.77	17.166	19.058	17.935	15.796	15.306	0.038	14.532	0.038	14.332	0.060	216085855	18.7	17.0	280	47.691662	0	0	M
2	7.908	18 20 27.77327	+33 26 25.6198	XPM 246-0418111	275.115722	+33.440450	-3.32	-8.29	-3.01	-7.77	18.194	19.524	18.847	17.471	17.286	0.162	16.297	0.151	17.407		216085860	19.1	18.4	280	47.691662	0	0	M

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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_
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magGrvs
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e_
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alphaEpoch
yr

deltaEpoch
yr

pmRA
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e_
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pmDE
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1 5.42018 20 26.81116+33 26 20.0181275.111713+33.438894 0.066 0.06619.058 0.30017.166 0.30017.374 0.40015.969 0.5001989.02001989.0200 1.5 3.8 13.4 3.8 2 7.87418 20 27.75696+33 26 25.9039275.115654+33.440529 0.100 0.10019.524 0.30018.194 0.30018.434 0.40017.380 0.5001976.99001976.9900 -8.8 4.8 0.3 4.8 %0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20Zone%20-40/%2b50deg%3cP%3e%0a

Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	CMC15	RA_ICRS deg	DE_ICRS deg	r'mag mag	pflag	Nt	Jmag mag	Hmag mag	Ksmag mag
1	4.628	18 20 27.25130	+33 26 17.1887	182027.2+332617	275.113547	+33.438108	15.080	:	1
2	5.256	18 20 26.82169	+33 26 20.1408	182026.8+332620	275.111757	+33.438928	17.303		2	15.306	14.532	14.332

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