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	0.311	09 48 39.93216	-34 51 37.1304	0525-12268086	147.166384	-34.860314			17.5	17.3	1982.591
2	8.780	09 48 40.50936	-34 51 42.5628	0525-12268303	147.168789	-34.861823			19.4	17.6	1982.591

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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	0.450	09 48 39.90264	-34 51 37.1412	S133223219114	147.166261	-34.860317	1993.153	17.15	0.42	17.77	0.41	0	3.34	0.12
2	8.649	09 48 40.48944	-34 51 42.6744	S133223219107	147.168706	-34.861854	1993.153	18.24	0.42			3	2.87	0.04

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>	\BegDIVclass='sort-down ' </A>
dec 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	0.286	09 48 39.94872	-34 51 37.2708	0551-0218115	147.166453	-34.860353	96	63	1987.6	0	0	4		17.20	17.79	17.71	16.66
2	8.955	09 48 40.52280	-34 51 42.6312	0551-0218122	147.168845	-34.861842	160	85	1987.6	0	0	4		17.95	19.99	18.39	17.92
3	9.299	09 48 40.43472	-34 51 30.5208	0551-0218121	147.168478	-34.858478	300	999	1985.7	-202	-56	3			20.02	19.77	18.07

Note: The Naval Observatory Merged Astrometric Dataset (NOMAD) contains astrometric and photometric data for over 1 billion stars derived from the Hipparcos (I/239), Tycho-2 (I/259), UCAC2 (I/289), and USNO-B1.0 (I/284) catalogs for astrometry and optical photometry, supplemented by 2MASS (II/246) near-infrared photometry.
An efficient remote query program findnomad1 is available in the cdsclient package, for Unix/Linux platforms

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	0.286	09 48 39.948672	-34 51 37.27008	0551-0223345	YM	147.1664528	-34.8603528	B	0.0	0.0	0.0	0.0	17.640	Y	17.390	Y	17.710	B	16.446	15.903	15.368
2	8.952	09 48 40.522656	-34 51 42.63012	0551-0223352	..	147.1688444	-34.8618417	B	0.0	0.0	0.0	0.0	19.990	B			18.390	B
3	9.299	09 48 40.434672	-34 51 30.52008	0551-0223351	..	147.1684778	-34.8584778	B	-202.0	19.0	-56.0	152.0	20.020	B			19.770	B

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

GSC2.3

%22>RAJ2000
degDEJ2000
degEpoch
yrFmag
magjmag
magVmag
magNmag
magClass

a
pixe

1 0.45309 48 39.90288-34 51 37.1340S69A019114147.166262-34.8603151993.15317.1517.77  14.830 3.34 0.12 2 8.65009 48 40.48968-34 51 42.6708S69A019107147.168707-34.8618531993.15318.2419.99  18.003 2.87 0.04 %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	0.134	09 48 39.92736	-34 51 37.3104	147.166364	-34.860364	-1.8	-7.7	16.447	15.369		17.79	17.20	17.71	16.66	5	0
2	8.690	09 48 40.50456	-34 51 42.4908	147.168769	-34.861803	-6.1	14.5				19.99	17.95	18.39	17.92	4	0
3	9.396	09 48 40.42464	-34 51 30.2832	147.168436	-34.858412	-203.6	-57.2				20.02		19.77	18.07	3	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	[****ClosingBrace(s)Inserted****]
">

mag&%">\BegDIVclass='sort-down ' </A>decBjmag
magVmag
magNmag
magJmag
mage_
magHmag
mage_
magKmag
mage_
mag2Mkey

Bmag
magRmag
magFld

dT
yrfg

fs

M

1 0.25509 48 39.91728-34 51 37.2386XPM 110-0420647147.166322-34.860344 -4.67 -3.71 -5.72 -3.1717.14817.765  14.83216.447 0.12815.903 0.16515.369   41546584717.517.3 37316.72887000M %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"	SPMID	RAJ2000 deg	e_ mas	DEJ2000 deg	e_ mas	pmRA mas/yr	e_ (...)	pmDE mas/yr	e_ (...)	Epoch yr	N1	N2	Nc	Bmag mag	Vmag mag	Jmag mag	Hmag mag	Kmag mag	2M	igal	A
1	0.129	09 48 39.940392	-34 51 37.42236	4120321088	147.1664183	59.7	-34.8603951	56.5	18.14	7.10	-18.75	6.73	1981.72	7	4	0	18.90	17.00	16.447	15.903	15.369	2M	0	A

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