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	2.287	17 21 20.28600	-16 22 04.3032	0675-18959279	260.334525	-16.367862			16.6	15.8	1954.583
2	6.897	17 21 20.65872	-16 22 02.3232	0675-18959984	260.336078	-16.367312			17.0	16.3	1954.583

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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	2.055	17 21 20.22696	-16 22 04.5408	S223113069409	260.334279	-16.367928	1988.536	15.92	0.41	16.32	0.41	3	3.55	0.23
2	6.767	17 21 20.64984	-16 22 02.3844	S223113069410	260.336041	-16.367329	1988.536	16.26	0.41	17.06	0.42	0	3.52	0.15

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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	2.229	17 21 20.25480	-16 22 04.5516	0736-0379561	260.334395	-16.367931	187	112	1975.1	0	0	5	17.71	15.93	16.10	15.44	15.29
2	6.346	17 21 20.62080	-16 22 02.6904	0736-0379565	260.335920	-16.367414	173	78	1975.1	0	0	5	18.04	16.22	16.70	15.66	15.52

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	2.227	17 21 20.254656	-16 22 04.55016	0736-0386677	YM	260.3343944	-16.3679306	B	0.0	0.0	0.0	0.0	16.720	Y	16.420	Y	15.440	B	15.051	14.640	14.263
2	6.344	17 21 20.620656	-16 22 02.69004	0736-0386681	YM	260.3359194	-16.3674139	B	0.0	0.0	0.0	0.0	16.580	Y	16.510	Y	15.660	B	15.080	14.814	14.592

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Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	CMC14	f_	RAICRS [****ClosingBrace(s)Inserted****]
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RAICRS

%22>%5cFONT SIZE=-1degDEICRS
degr'mag
magNt

Jmag
magHmag
magKsmag
mag 1 6.92617 21 20.66112-16 22 02.4960172120.6-162202  260.336088-16.36736016.852 215.08014.815   %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	2.049	17 21 20.22720	-16 22 04.5336	S8KC069409	260.334280	-16.367926	1988.536	15.92	16.32		15.56	3	3.55	0.23
2	6.770	17 21 20.65008	-16 22 02.3808	S8KC069410	260.336042	-16.367328	1988.536	16.26	17.06		15.87	0	3.52	0.15
3	7.561	17 21 20.26440	-16 21 55.1376	S8KC070123	260.334435	-16.365316	1988.536	18.54	19.88		17.74	3	2.32	0.20
4	7.684	17 21 19.93368	-16 21 55.7820	S8KC069511	260.333057	-16.365495	1984.655		21.61			3	1.61	0.29

%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 [****ClosingBrace(s)Inserted****]
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%27%29%22%20onMouseOut=%22laz%28%29%22>r2mag

%20

%22>%5cFONT SIZE=-1magimag
mag

No

fl

1 2.18317 21 20.15640-16 22 04.7568260.333985-16.367988 -35.0 -13.415.05114.26417.7116.1015.93  15.29 5 1 2 6.75017 21 20.64864-16 22 02.3628260.336036-16.367323 7.8 -0.215.08014.59218.0416.7016.22  15.52 5 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	2.261	17 21 20.13960	-16 22 04.7855	XPM 147-0539973	260.333915	-16.367996	-40.51	-7.82	-41.67	-8.13	15.921	16.317		15.556	15.051	0.065	14.640	0.073	14.264	0.090	1275006006	16.6	15.8	809	43.734882	0	0	M
2	6.766	17 21 20.64960	-16 22 02.3089	XPM 147-0539991	260.336040	-16.367308	3.03	3.16	1.87	2.84	16.264	17.057		15.874	15.080	0.062	14.815	0.093	14.592	0.111	1275006003	17.0	16.3	809	43.734882	0	0	M

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