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	2.726	01 38 12.09408	+23 42 34.2108	1125-00540540	024.550392	+23.709503			19.2	18.1	1954.739
2	4.591	01 38 11.93880	+23 42 34.2432	1125-00540529	024.549745	+23.709512			17.8	17.1	1954.739

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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	4.709	01 38 11.93352	+23 42 34.3728	EO1229-0189279	024.549723	+23.709548	17.23		1	15.77	11.5	0.38	17.95		1	21.25	15.3	0.72
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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	3.635	01 38 12.00432	+23 42 33.9156	N32300014840	024.550018	+23.709421	1995.661	17.01	0.43	18.56	0.13	3	6.06	0.41

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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	2.774	01 38 12.09144	+23 42 34.2432	1137-0019814	024.550381	+23.709512	50	312	1968.4	-12	0	3	19.36	18.76			17.86
2	4.078	01 38 11.98752	+23 42 34.4520	1137-0019813	024.549948	+23.709570	166	97	1978.3	0	0	5	18.32	17.34	16.87	16.58	16.43
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%3cEM%3e2&%3cFONT%20COLOR=%27#CD5B45%27>%204.078&%3cFONT%20COLOR=%27#CD5B45%27>01%2038%2011.98752&%3cFONT%20COLOR=%27#CD5B45%27>%2b23%2042%2034.4520&1137-0019813&024.549948&%2b23.709570&166&%2097&1978.3&%20%20%20%20%200&%20%20%20%20%200&5&18.32&17.34&16.87&16.58&16.43%3cBR%3e">\Ahref='VizieR-5?-ref=VIZ66383f4fae44f&-out.add=.&-source=I/284/out&USNO-B1.0===1137-0019812&-out.orig=o' class='full'3 4.62301 38 11.93688+23 42 34.26121137-0019812024.549737+23.7095171682041968.4 0 0317.6416.77    17.10 %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	2.773	01 38 12.091344	+23 42 34.23996	1137-0019963	..	024.5503806	+23.7095111	B	-12.0	1.0	0.0	8.0	19.360	o			18.760	e
2	4.080	01 38 11.987328	+23 42 34.44984	1137-0019962	..	024.5499472	+23.7095694	B	0.0	0.0	0.0	0.0	16.870	B			16.580	B
3	4.625	01 38 11.936664	+23 42 34.26012	1137-0019961	..	024.5497361	+23.7095167	B	0.0	0.0	0.0	0.0	17.640	o			16.770	e

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Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	GSC2.3 [****ClosingBrace(s)Inserted****]
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GSC2.3

%22>RAJ2000
degDEJ2000
degEpoch
yrFmag
magjmag
magVmag
magNmag
magClass

a
pixe

1 3.63301 38 12.00456+23 42 33.9192NBNL004840024.550019+23.7094221995.66117.0118.5618.0017.003 6.06 0.41 %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	2.460	01 38 12.10464	+23 42 33.9660	024.550436	+23.709435	-11.3	-7.7			19.36		18.76		17.86	3	0
2	4.018	01 38 11.98224	+23 42 34.1748	024.549926	+23.709493	-5.3	-8.0			18.32	16.87	17.34	16.58	16.43	5	0
3	4.433	01 38 11.95080	+23 42 34.2252	024.549795	+23.709507	3.2	-0.8			17.64		16.77		17.10	3	0

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Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	RAJ2000 deg	DEJ2000 deg	e_RAJ2000 (...)	e_DEJ2000 arcsec	magBJ mag	e_ mag	[****ClosingBrace(s)Inserted****]
">

mag&%">\BegDIVclass='sort-down ' </A>decmagRF
mage_
magmagG
mage_
magmagGrvs
mage_
magalphaEpoch
yrdeltaEpoch
yrpmRA
mas/yre_
(...)pmDE
mas/yre_
(...) 1 2.46001 38 12.10464+23 42 33.9660024.550436+23.709435 0.133 0.13319.360 0.40018.760 0.40018.900 0.40018.362 0.5001968.40001968.4000 -11.3 6.9 -7.7 6.9 2 4.01801 38 11.98225+23 42 34.1749024.549926+23.709493 0.103 0.10318.558 0.30017.010 0.30017.251 0.40016.055 0.5001978.38001978.3800 -5.3 5.2 -8.0 5.2 3 4.13901 38 11.97556+23 42 34.2638024.549898+23.709518 0.065 0.02817.640 0.40016.770 0.40017.808 0.08216.923 0.1112009.73002009.7300 3.2 6.9 -0.8 6.9 %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"	RAICRS deg	e_ mas	DEICRS deg	e_ mas	ID	Type	pmRA mas/yr	e_ (...)	pmDE mas/yr	e_ (...)	Nobs	Dt yr	Rmag mag	Bmag mag	Nmag mag	Vmag mag	Jmag mag	Hmag mag	Kmag mag
1	3.989	01 38 11.982994	+23 42 34.12796	024.5499291	276.00	+23.7094800	155.00	64257+0004840	4	2.4	7.3	-0.8	4.1	6	41.795	17.010	18.558	17.002	17.995

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