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	3.867	18 45 25.36344	-29 07 06.8628	0600-37299280	281.355681	-29.118573			17.5	16.7	1978.476

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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	4.008	18 45 25.39104	-29 07 06.6936	S301302212169	281.355796	-29.118526	1996.688	17.11	0.46			3	2.53	0.24
2	6.673	18 45 24.89112	-29 07 10.4268	S301302212128	281.353713	-29.119563	1996.688	16.85	0.45			3	2.32	0.13
3	7.611	18 45 25.72584	-29 07 17.0004	S301302212069	281.357191	-29.121389	1996.688	17.10	0.45			0	2.04	0.11

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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	3.838	18 45 25.38144	-29 07 06.8700	0608-0830762	281.355756	-29.118575	145	67	1973.3	0	0	5	18.30	17.11	17.83	17.23	16.96
2	6.495	18 45 24.90672	-29 07 10.0524	0608-0830738	281.353778	-29.119459	61	99	1973.3	0	0	5	17.94	16.78	17.75	17.00	16.44
3	7.922	18 45 25.75080	-29 07 17.1516	0608-0830790	281.357295	-29.121431	47	146	1973.3	0	0	5	18.01	16.68	17.81	17.15	16.94
4	9.636	18 45 24.87144	-29 07 04.0008	0608-0830735	281.353631	-29.117778	428	439	1965.5	0	0	2		18.77	19.33

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	3.838	18 45 25.381344	-29 07 06.87000	0608-0940061	YM	281.3557556	-29.1185750	B	0.0	0.0	0.0	0.0	17.830	B	17.210	Y	17.230	B	16.009	15.686	15.192
2	6.496	18 45 24.906672	-29 07 10.04988	0608-0940036	YM	281.3537778	-29.1194583	B	0.0	0.0	0.0	0.0	17.020	Y	17.230	Y	17.000	B	15.580	15.269	15.159
3	7.920	18 45 25.750656	-29 07 17.15016	0608-0940089	YM	281.3572944	-29.1214306	B	0.0	0.0	0.0	0.0	17.200	Y	17.130	Y	17.150	B	15.993	15.569	16.100
4	9.637	18 45 24.871344	-29 07 04.00008	0608-0940033	..	281.3536306	-29.1177778	B	0.0	0.0	0.0	0.0	19.330	B			18.770	e

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Full	_r arcsec	_RAJ2000 [****ClosingBrace(s)Inserted****]
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RAICRS
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Jmag
magHmag
magKsmag
mag 1 6.79118 45 24.88176-29 07 10.7976184524.8-290710  281.353674-29.11966616.650 115.580     %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	4.016	18 45 25.39128	-29 07 06.6864	S9U2012169	281.355797	-29.118524	1996.688	17.11		17.10	16.74	3	2.53	0.24
2	6.670	18 45 24.89136	-29 07 10.4232	S9U2012128	281.353714	-29.119562	1996.688	16.85		17.01	16.40	0	2.32	0.13
3	7.608	18 45 25.72584	-29 07 16.9968	S9U2012069	281.357191	-29.121388	1996.688	17.10		17.32	16.71	0	2.04	0.11

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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	[****ClosingBrace(s)Inserted****]
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1 3.62118 45 25.41120-29 07 07.0824281.355880-29.118634 10.1 -4.916.00915.19218.3017.8317.1117.2316.96 6 0 2 6.33718 45 24.91632-29 07 10.6392281.353818-29.119622 1.9 -17.015.58015.15917.9417.7516.7817.0016.44 6 0 3 8.19018 45 25.76256-29 07 17.3712281.357344-29.121492 2.9 -7.915.99416.10018.0117.8116.6817.1516.94 6 0 4 8.62918 45 24.92304-29 07 04.7496281.353846-29.117986 22.6 -25.0      19.3318.77     2 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	3.586	18 45 25.42173	-29 07 07.1257	XPM 121-1278280	281.355924	-29.118646	31.99	-8.43	30.24	-9.16					16.009	0.097	15.687	0.175	15.192		611393095	17.5	16.7	458	20.965221	0	0	M

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