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	4.835	10 18 49.28736	+19 05 31.8408	1050-06251679	154.705364	+19.092178			17.5	16.6	1950.216

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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	4.909	10 18 49.25616	+19 05 31.9812	EO1356-0058857	154.705234	+19.092217	17.55		-1	1.99	12.7	0.07	19.13		1	12.25	11.0	1.58
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Note: The construction of the GSC-II is still in progress: this version has no proper motions, and the magnitude limits are 18.5 in F (red) and 19.5 in J (blue). The data are copyrighted, check the data use Policy.

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	4.787	10 18 49.29648	+19 05 31.8372	N20300104296	154.705402	+19.092177	1998.990	16.96	0.42	17.85	0.40	3	3.82	0.19

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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	1.109	10 18 49.34808	+19 05 36.2616	1090-0183083	154.705617	+19.093406	194	388	1968.1	8	104	3	19.63	18.02		19.62
2	4.610	10 18 49.29000	+19 05 32.0712	1090-0183082	154.705375	+19.092242	98	70	1950.0	0	0	5	18.10	16.74	16.73	16.34	16.85
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%3cEM%3e2&%3cFONT%20COLOR=%27#CD5B45%27>%204.610&%3cFONT%20COLOR=%27#CD5B45%27>10%2018%2049.29000&%3cFONT%20COLOR=%27#CD5B45%27>%2b19%2005%2032.0712&1090-0183082&154.705375&%2b19.092242&%2098&%2070&1950.0&%20%20%20%20%200&%20%20%20%20%200&5&18.10&16.74&16.73&16.34&16.85%3cBR%3e">\Ahref='VizieR-5?-ref=VIZ6621ef9c2b795a&-out.add=.&-source=I/284/out&USNO-B1.0===1090-0183081&-out.orig=o' class='full'3 6.91810 18 49.03152+19 05 32.19001090-0183081154.704298+19.0922759999551952.7 0 0217.2219.83       %0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20The%20Naval%20Observatory%20Merged%20Astrometric%20Dataset%20%28NOMAD%29%20contains%0aastrometric%20and%20photometric%20data%20for%20over%201%20billion%20stars%20derived%20from%0athe%20Hipparcos%20%28I/239%29,%20Tycho-2%20%28I/259%29,%20UCAC2%20%28I/289%29,%20and%20USNO-B1.0%0a%28I/284%29%20catalogs%20for%20astrometry%20and%20optical%20photometry,%20supplemented%0aby%202MASS%20%28II/246%29%20near-infrared%20photometry.%3cBR%3e%0a%3cFONT%20SIZE=%27-1%27%3eAn%20efficient%20remote%20query%20program%20%3cB%3efindnomad1%20is%0aavailable%20in%20the%20cdsclient%20%0apackage,%20for%20Unix/Linux%20platforms%0a%3cP%3e%0a

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	1.110	10 18 49.348008	+19 05 36.26016	1090-0186916	..	154.7056167	+19.0934056	B	8.0	5.0	104.0	10.0	19.630	o			19.620	B
2	4.611	10 18 49.290000	+19 05 32.07012	1090-0186915	..	154.7053750	+19.0922417	B	0.0	0.0	0.0	0.0	16.730	B			16.340	B
3	6.920	10 18 49.031328	+19 05 32.19000	1090-0186914	..	154.7042972	+19.0922750	B	0.0	0.0	0.0	0.0	17.220	o			19.830	e

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

%22>RAJ2000
degDEJ2000
degEpoch
yrFmag
magjmag
magVmag
magNmag
magClass

a
pixe

1 4.78410 18 49.29648+19 05 31.8408N6X0004296154.705402+19.0921781998.99016.9617.8517.9917.133 3.82 0.19 %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	1.106	10 18 49.35024	+19 05 36.0096	154.705626	+19.093336	2.1	97.7			19.63		18.02	19.62		3	0
2	4.724	10 18 49.29408	+19 05 31.9200	154.705392	+19.092200	-3.3	0.1			18.10	16.73	16.74	16.34	16.85	5	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 1.10610 18 49.35024+19 05 36.0100154.705626+19.093336 0.133 0.13319.630 0.40019.620 0.40019.607 0.40019.518 0.5001968.14001968.1400 2.1 6.1 97.7 6.1 2 4.68410 18 49.29216+19 05 31.9764154.705384+19.092216 0.021 0.03117.849 0.30016.961 0.30017.580 0.08116.482 0.1112005.18002005.1800 -3.3 4.8 0.1 4.8 %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"	RAICRS deg	e_ mas	DEICRS deg	e_ mas	ID	Type	pmRA mas/yr	e_ (...)	pmDE mas/yr	e_ (...)	Nobs	Dt yr	Rmag mag	Bmag mag	Nmag mag	Vmag mag	Jmag mag	Hmag mag	Kmag mag
1	4.841	10 18 49.285269	+19 05 31.84805	154.7053553	139.00	+19.0921800	90.00	58116+0004296	4	-5.0	4.1	-2.4	2.7	8	51.895	16.961	17.849	17.126	17.986

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