VizieR

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The 5 columns in color are computed by VizieR, and are not part of the original data.

Full	_r arcsec	_RAJ2000 "h:m:s"	_DEJ2000 "d:m:s"	Name	RAB1950 "h:m:s"	DEB1950 "d:m:s"	bmag mag	Nfields	Flag1	Flag2	Flag3	_RA.icrs "h:m:s"	_DE.icrs "d:m:s"
1	8.388	20 47 57.48830	-12 58 56.5370	-13.0500	20 45 12.112	-13 10 02.62	16.19	1	0	0	0	20 47 57.488	-12 58 56.54

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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 3.167 20 47 56.84952 -12 58 59.6532 0750-20404097 311.986873 -12.983237 18.0 17.1 1953.619

2 4.394 20 47 56.75136 -12 59 00.3228 0750-20404072 311.986464 -12.983423 17.9 18.4 1953.619

3 5.371 20 47 57.09600 -12 59 01.3020 0750-20404153 311.987900 -12.983695 17.3 16.6 1953.619

4 8.521 20 47 57.49680 -12 58 56.2332 0750-20404250 311.989570 -12.982287 11.9 10.8 1953.619

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Note: The Guide Star Catalog has been constructed to support the operational need of the Hubble Space Telescope. It contains over 25 million positions for about 19 million objects, of which more than 15 million are classified as stars. The version 1.2 is a new astrometric reduction which results in absolute position errors about 0.3-0.4 arcsec. (see GSC pages at URL http://www-gsss.stsci.edu/gsc/gsc.html)

Full

_r
arcsec

_RAJ2000
"h:m:s"

_DEJ2000
"d:m:s"

GSC

RAJ2000
deg

DEJ2000
deg

PosErr
arcsec

Pmag
mag

e_
mag

n_

Class

Plate

Epoch
yr

1 8.10 20 47 57.4680 -12 58 56.316 0576400991 311.98945 -12.98231 0.6 13.09 0.40 0 0 00E1 1982.697

2 8.37 20 47 57.4872 -12 58 56.856 0576400991 311.98953 -12.98246 0.3 13.21 0.40 0 3 00SA 1981.432

%0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20The%20%3cB%3eGSC-ACT%20%3cEM%3e%28or%20%3cB%3eGSC1.3%29%0ais%20a%20recalibration%20of%20the%20%3cB%3e<%25E%20I/220%7cGSC1.1>,%20the%20catalogue%20constructed%20%0ato%20support%20the%20operational%20need%20of%20the%20Hubble%20Space%20Telescope,%0awith%20the%20%3cB%3e<%25E%20I/246%7cACT>,%20the%20combination%20of%20the%20Astrographic%20Catalogue%0aand%20the%20%3cB%3e%3cEM%3eTycho%20catalogue%20derived%20from%20the%20%3cEM%3e<%25E%20I/239%7cHipparcos>%0amission;%20see%20http://www.projectpluto.com/gsc_act.htm%20for%20more%20details%0aabout%20this%20recalibration.%0a%3cP%3e%0a
Full

_r
arcsec

_RAJ2000
"h:m:s"

_DEJ2000
"d:m:s"

GSC

RAJ2000
deg

DEJ2000
deg

PosErr
arcsec

Pmag
mag

e_
mag

n_

Class

Epoch
yr

1 8.01 20 47 57.4608 -12 58 56.028 0576400991 311.98942 -12.98223 0.6 13.10 0.40 0 0 1982.697

2 8.13 20 47 57.4704 -12 58 56.604 0576400991 311.98946 -12.98239 0.3 13.22 0.40 0 3 1981.432

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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

7.660

20 47 57.43848

-12 58 56.7624

S3313221542

311.989327

-12.982434

1985.482

11.73

0.44

12.27

0.42

10.71

0.26

%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	2.706	20 47 57.02880	-12 58 58.7604	0770-0808736	311.987620	-12.982989	999	984	1964.2	0	0	3	17.19	17.20		17.29
2	3.251	20 47 56.78088	-12 58 59.2320	0770-0808735	311.986587	-12.983120	359	160	1967.3	-18	12	3	18.38	17.18			17.15
3	3.749	20 47 57.16800	-12 58 57.2016	0770-0808739	311.988200	-12.982556	999	670	1953.6	0	0	2	16.96	17.20
4	4.359	20 47 57.06072	-12 59 00.4308	0770-0808738	311.987753	-12.983453	338	210	1964.2	-14	30	3	17.78	16.79		16.29
5	4.868	20 47 57.04488	-12 59 01.1112	0770-0808737	311.987687	-12.983642	359	108	1967.3	0	0	3	17.57	16.86			17.08
6	5.784	20 47 57.30216	-12 58 57.7920	0770-0808740	311.988759	-12.982720	999	999	1953.6	0	0	2	16.79	15.40
7	7.264	20 47 56.41752	-12 58 56.6112	0770-0808732	311.985073	-12.982392	57	109	1977.9	50	8	3		19.33		19.82	18.22
8	7.382	20 47 56.59680	-12 59 02.3712	0770-0808733	311.985820	-12.983992	999	999	1953.6	0	0	2	18.14	19.37
9	8.533	20 47 57.49800	-12 58 56.3808	0770-0808745	311.989575	-12.982328	140	157	1973.7	0	0	5	12.00	10.90	11.19	10.70	11.32

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Target Name (resolved by Sesame) or Position:	Target dimension:
NB: The epoch used for the query is the original epoch of the table(s)	Radius Box size