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	3.523	00 49 16.59936	+38 00 43.4232	1275-00491566	012.319164	+38.012062			17.5	17.1	1951.837

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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	3.339	00 49 16.55616	+38 00 43.3116	EO0398-0140362	012.318984	+38.012031	17.21		1	16.03	9.2	0.10	19.21		1	15.81	7.3	2.00
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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	3.251	00 49 16.60536	+38 00 43.8336	N330010215075	012.319189	+38.012176	1986.907	17.58	0.43	18.44	0.42	3	4.23	0.17

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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	3.414	00 49 16.61808	+38 00 43.7508	1280-0016671	012.319242	+38.012153	65	80	1974.3	10	2	5	18.52	16.68	17.60	17.12	17.73
2	7.871	00 49 16.70136	+38 00 39.1032	1280-0016672	012.319589	+38.010862	715	917	1964.4	30	-106	3	19.08	18.58		19.19
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%3cEM%3e2&%3cFONT%20COLOR=%27#CD5B45%27>%207.871&%3cFONT%20COLOR=%27#CD5B45%27>00%2049%2016.70136&%3cFONT%20COLOR=%27#CD5B45%27>%2b38%2000%2039.1032&1280-0016672&012.319589&%2b38.010862&715&917&1964.4&%20%20%20%2030&%20%20-106&3&19.08&18.58&%20&19.19&%20%3cBR%3e">\EndTABLESORT

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	3.414	00 49 16.618008	+38 00 43.75008	1280-0016724	..	012.3192417	+38.0121528	B	10.0	2.0	2.0	2.0	17.600	B			17.120	B
2	7.874	00 49 16.701336	+38 00 39.09996	1280-0016725	..	012.3195889	+38.0108611	B	30.0	17.0	-106.0	23.0	19.080	o			19.190	B

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Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	GSC2.3	RAJ2000 deg	DEJ2000 deg	Epoch yr	[****ClosingBrace(s)Inserted****]
">

yr&%">\BegDIVclass='sort-down ' </A>decFmag
magjmag
mag

Vmag
magNmag
magClass

a
pixe

1 3.25000 49 16.60560+38 00 43.8372NBV6015075012.319190+38.0121771986.90717.5818.4418.8617.883 4.23 0.17 %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	3.583	00 49 16.62504	+38 00 43.5960	012.319271	+38.012110	10.3	-4.0			18.52	17.60	16.68	17.12	17.73	5	0
2	8.146	00 49 16.71840	+38 00 38.8944	012.319660	+38.010804	36.7	-118.7			19.08		18.58	19.19		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	magRF mag	e_ mag	magG mag	[****ClosingBrace(s)Inserted****]
">

mag&%">\BegDIVclass='sort-down ' </A>dece_
magmagGrvs
mage_
magalphaEpoch
yrdeltaEpoch
yrpmRA
mas/yre_
(...)pmDE
mas/yre_
(...) 1 3.27100 49 16.57843+38 00 43.5548012.319077+38.012099 0.057 0.05718.438 0.30017.584 0.30017.932 0.08216.897 0.1112007.92002007.9200 10.3 5.5 -4.0 5.5 2 8.14600 49 16.71839+38 00 38.8942012.319660+38.010804 0.133 0.13319.080 0.40019.190 0.40019.142 0.40019.146 0.5001964.46001964.4600 36.7 7.4 -118.7 7.4 %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"	RA_ICRS deg	DE_ICRS deg	rmag mag	pmRA mas/yr	e_ (...)	pmxRA mas/yr	e_ (...)	Chi2RA	pmGRA mas/yr	pmDE mas/yr	e_ (...)	pmxDE mas/yr	e_ (...)	Chi2DE	pmGDE mas/yr	Nobs	Flag	PS1	Gaia	DR9+DR12	Sloan	2M
1	3.247	00 49 16.5994812082	+38 00 43.694373656	012.31910366031	+38.01212219229	20.048310	-17.258	24.908	-18.038	24.925	4.00871e-01		-5.448	25.764	1.882	26.117	2.71744e-03		4	0	PS1	Gaia	DR9+DR12	Sloan	2M

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