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	4.871	17 18 15.16008	-18 35 51.4500	0675-18637032	259.563167	-18.597625			18.8	17.3	1980.894
2	5.114	17 18 15.19536	-18 35 59.8200	0675-18637087	259.563314	-18.599950			17.8	15.9	1980.894
3	5.128	17 18 15.00600	-18 35 50.5320	0675-18636775	259.562525	-18.597370			19.5	18.0	1980.894

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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	5.053	17 18 15.15408	-18 35 51.1944	S223130326547	259.563142	-18.597554	1996.544	17.56	0.40			3	1.82	0.11
2	5.073	17 18 15.17928	-18 35 59.9244	S223130326449	259.563247	-18.599979	1996.544	15.93	0.35			0	2.57	0.06

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">Note: The USNO-B Catalog presents positions, proper motions, magnitudes un blue, red and infrared, as well as star/galaxy estimators for 1,045,175,762 objects derived from 3,648,832,040 separate observations. The data were taken from scans of 7,435 Schmidt plates taken from various sky surveys during the last 50 years.
USNO-B1.0 catalog was created by Dave Monet and collaborators at http://www.nofs.navy.mil/data/fchpix/
Note that the star/galaxy estimators may be mixed up in dense regions.

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	4.709	17 18 15.16152	-18 35 51.6516	0714-0384511	259.563173	-18.597681	76	38	1972.8	0	0	5	19.98	17.54	18.82	17.79	16.38
2	4.991	17 18 14.99016	-18 35 50.6616	0714-0384504	259.562459	-18.597406	14	10	1981.5	0	0	2			19.22		17.54
3	5.426	17 18 15.20544	-18 36 00.1008	0713-0387207	259.563356	-18.600028	109	60	1972.8	2	-6	5	19.77	15.87	18.38	16.20	14.54

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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 [****ClosingBrace(s)Inserted****]
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Vmag

%22>%5cFONT SIZE=-1magr_

Rmag
magr_

Jmag
magHmag
magKmag
magR

1 4.70917 18 15.161328-18 35 51.650160714-0393496.M259.5631722-18.5976806B 0.0 0.0 0.0 0.018.820B    17.790B15.30414.58214.496   2 4.99317 18 14.989992-18 35 50.660160714-0393489..259.5624583-18.5974056B 0.0 0.0 0.0 0.019.220B                 3 5.42517 18 15.205344-18 36 00.100080713-0395934YM259.5633556-18.6000278B 2.0 3.0 -6.0 1.018.380B16.280Y16.200B12.92811.96711.705   %0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20Zone%20-30/%2b50deg%3cP%3e%0a

Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	CMC14	f_	RAICRS deg	DEICRS deg	r'mag mag	Nt	Jmag mag	Hmag mag	Ksmag mag
1	5.398	17 18 15.20736	-18 36 00.0468	171815.2-183600		259.563364	-18.600013	16.141	2	12.928	11.968	11.706

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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	5.057	17 18 15.15432	-18 35 51.1908	S8KZ026547	259.563143	-18.597553	1996.544	17.56			16.45	3	1.82	0.11
2	5.071	17 18 15.17952	-18 35 59.9208	S8KZ026449	259.563248	-18.599978	1996.544	15.93		16.45	14.84	0	2.57	0.06

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