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	4.462	02 44 57.79080	+34 05 41.3808	1200-01188685	041.240795	+34.094828			13.5	13.4	1954.972

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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	4.693	02 44 57.80808	+34 05 41.6220	EO1307-0348678	041.240867	+34.094895	13.12		1	18.97	28.5	0.56	13.49		1	12.71	34.9	0.37
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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	4.492	02 44 57.79344	+34 05 41.0208	N333332019939	041.240806	+34.094728	1988.714	12.63	0.42	13.10	0.42	3	12.30	0.60

%0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20The%20%3cB%3eUSNO-B%20Catalog%20presents%20positions,%20proper%20motions,%20%0amagnitudes%20un%20blue,%20red%20and%20infrared,%20as%20well%20as%20star/galaxy%20estimators%0afor%201,045,175,762%20objects%20derived%20from%203,648,832,040%20separate%20observations.%0aThe%20data%20were%20taken%20from%20scans%20of%207,435%20Schmidt%20plates%0ataken%20from%20various%20sky%20surveys%20during%20the%20last%2050%20years.%3cBR%3e%0aUSNO-B1.0%20catalog%20was%20created%20by%20Dave%20Monet%20and%20collaborators%0aat%20http://www.nofs.navy.mil/data/fchpix/%20%3cBR%3e%0a%3cB%3e%3cFONT%20COLOR=%27#EE0000%27>%20Note%20that%20the%20star/galaxy%20estimators%20may%20be%20mixed%20up%0a%20in%20dense%20regions.%0a%3cP%3e%0a

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	2.064	02 44 57.56952	+34 05 40.0128	1240-0038849	041.239873	+34.094448	999	999	1966.2	-160	-68	3	13.86	16.02		12.37
2	4.024	02 44 57.33552	+34 05 45.0132	1240-0038846	041.238898	+34.095837	621	525	1975.3	0	0	2	20.37				19.21
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%3cEM%3e2&%3cFONT%20COLOR=%27#CD5B45%27>%204.024&%3cFONT%20COLOR=%27#CD5B45%27>02%2044%2057.33552&%3cFONT%20COLOR=%27#CD5B45%27>%2b34%2005%2045.0132&1240-0038846&041.238898&%2b34.095837&621&525&1975.3&%20%20%20%20%200&%20%20%20%20%200&2&20.37&%20&%20&%20&19.21%3cBR%3e">\Ahref='VizieR-5?-ref=VIZ663f5e2836080b&-out.add=.&-source=I/284/out&USNO-B1.0===1240-0038850&-out.orig=o' class='full'3 4.33202 44 57.78072+34 05 41.24041240-0038850041.240753+34.0947893231271977.6 0 0513.5612.9313.0912.3011.73 4 7.71002 44 56.84136+34 05 38.80321240-0038843041.236839+34.0941124348101971.8 0 0220.27    19.67   514.57702 44 56.41680+34 05 33.86041240-0038842041.235070+34.0927393569991994.6 0 02    20.25  19.15 615.16202 44 56.40480+34 05 32.98201240-0038841041.235020+34.0924951555061983.2 0 04  19.6820.8619.7218.88 %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	2.064	02 44 57.569328	+34 05 40.00992	1240-0039276	..	041.2398722	+34.0944472	B	-160.0	64.0	-68.0	26.0	13.860	o			12.370	B
2	4.021	02 44 57.335328	+34 05 45.00996	1240-0039273	..	041.2388972	+34.0958361	B	0.0	0.0	0.0	0.0	20.370	o
3	4.332	02 44 57.780672	+34 05 41.24004	1240-0039277	YM	041.2407528	+34.0947889	B	0.0	0.0	0.0	0.0	18.140	Y			12.300	B	15.144	14.561	14.349
4	7.711	02 44 56.841336	+34 05 38.79996	1240-0039270	..	041.2368389	+34.0941111	B	0.0	0.0	0.0	0.0	20.270	o			19.670	B
5	14.579	02 44 56.416656	+34 05 33.86004	1240-0039269	..	041.2350694	+34.0927389	B	0.0	0.0	0.0	0.0	20.250	B
6	15.165	02 44 56.404656	+34 05 32.97984	1240-0039268	..	041.2350194	+34.0924944	B	0.0	0.0	0.0	0.0	20.860	B			19.720	B
7	23.828	02 44 58.906728	+34 05 56.41008	1240-0039280	.M	041.2454447	+34.0990028	M	0.0	0.0	0.0	0.0							18.728	17.237	15.121
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7	23.828	02 44 58.906728	+34 05 56.41008	1240-0039280	.M	041.2454447	+34.0990028	M	0.0	0.0	0.0	0.0							18.728	17.237	15.121

%22>\EndTABLESORT

Note: Zone -30/+50deg

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	4.176	02 44 57.76632	+34 05 40.7364	024457.7+340540		041.240693	+34.094649	16.551	3	15.145	14.562	14.349

%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	4.495	02 44 57.79368	+34 05 41.0244	NCMW019939	041.240807	+34.094729	1988.714	12.63	13.10	14.54	12.38	3	12.30	0.60
2	15.593	02 44 56.39640	+34 05 32.3592	NCMW019913	041.234985	+34.092322	1988.714	19.78	22.05		19.00	3	2.41	0.41
3	28.095	02 44 55.23240	+34 05 47.7168	NCMW022960	041.230135	+34.096588	1993.708		22.31			3	1.52	0.26

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