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	2.551	01 51 50.81400	+20 54 56.0628	1050-00509600	027.961725	+20.915573			16.8	17.0	1954.893

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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	2.689	01 51 50.82408	+20 54 56.0628	EO1275-0029774	027.961767	+20.915573	16.54		-1	-1.76	8.1	0.05	17.25		-1	-0.21	11.2	0.70
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%3cEM%3e1&%3cFONT%20COLOR=%27#CD5B45%27>%202.689&%3cFONT%20COLOR=%27#CD5B45%27>01%2051%2050.82408&%3cFONT%20COLOR=%27#CD5B45%27>%2b20%2054%2056.0628&EO1275-0029774&027.961767&%2b20.915573&16.54&%20&-1&%20%20-1.76&%20%20%208.1&%200.05&17.25&%20&-1&%20%20-0.21&%20%2011.2&%20%200.70&%20%3cBR%3e">\Ahref='VizieR-5?-ref=VIZ6644249626a945&-out.add=.&-source=I/267/out&APM-ID===EO1275-0029885&-out.orig=o' class='full'221.80701 51 51.93408+20 54 43.5708EO1275-0029885027.966392+20.91210319.73  -1 1.13 4.3 0.3822.24L 0     2.51   %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	2.778	01 51 50.83128	+20 54 55.9980	N32110314818	027.961797	+20.915555	1986.692	17.18	0.42	17.45	0.41	0	2.87	0.03

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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	2.586	01 51 50.81352	+20 54 56.2500	1109-0021167	027.961723	+20.915625	39	52	1976.6	0	0	5	16.51	16.60	17.80	17.07	16.27
2	27.377	01 51 50.49144	+20 54 28.2816	1109-0021166	027.960381	+20.907856	261	97	1991.0	0	0	3			21.18	19.78	18.85
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%3cEM%3e2&%3cFONT%20COLOR=%27#CD5B45%27>27.377&%3cFONT%20COLOR=%27#CD5B45%27>01%2051%2050.49144&%3cFONT%20COLOR=%27#CD5B45%27>%2b20%2054%2028.2816&1109-0021166&027.960381&%2b20.907856&261&%2097&1991.0&%20%20%20%20%200&%20%20%20%20%200&3&%20&%20&21.18&19.78&18.85%3cBR%3e">\EndTABLESORT

Note: More recent versions available: UCAC3 (I/315) and UCAC4 (I/322); see also the UCAC home page at http://ad.usno.navy.mil/ucac/

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	2.703	01 51 50.824104	+20 54 56.13012	39084668	027.9617671	92	+20.9155917	110	16.60	2	2	7.5	-4.9	341116923	15.933	15.605

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

mag&%">\BegDIVclass='sort-down ' </A>decHmag
magKmag
mag

R

1 2.70201 51 50.824056+20 54 56.130121109-0021392YM027.9617669+20.9155917C 7.4 7.9 -4.9 9.117.290Y17.180Y17.070B15.93315.70315.605   227.37801 51 50.491344+20 54 28.280161109-0021391..027.9603806+20.9078556B 0.0 0.0 0.0 0.021.180B    19.780B         %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	2.770	01 51 50.83008	+20 54 56.0520	015150.8+205456		027.961792	+20.915570	16.753	4	15.933

%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	2.782	01 51 50.83152	+20 54 56.0016	NBBH004818	027.961798	+20.915556	1986.692	17.18	17.45	16.59	16.43	0	2.87	0.03
2	27.704	01 51 50.55288	+20 54 27.9036	NBBH004769	027.960637	+20.907751	1986.692	19.71				3	2.13	0.33

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