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I/289 ==OBSOLETE version of Catalogue==
29-Aug-2009: (by Francois Ochsenbein) See UCAC3 I/315
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=I/289
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drwxr-xr-x 2 cats archive 8192 Apr 30 2013 u2 Beginning of ReadMe :I/289 UCAC2 Catalogue (Zacharias+ 2004)
================================================================================
The Second U.S. Naval Observatory CCD Astrograph Catalog (UCAC2)
Zacharias N., Urban S.E., Zacharias M.I., Wycoff G.L., Hall D.M.,
Germain M.E., Holdenried E.R., Winter L.
<Astron. J. 127, 3043 (2004)>
=2004AJ....127.3043Z
================================================================================
ADC_Keywords: Surveys ; Positional data ; Proper motions
Description:
The UCAC2 is the second release of the ongoing UCAC project, designed
to observe the entire sky for R magnitudes of about 7.5 to 16. The
observed positional errors are about 20 mas for the stars in the 10-14
magnitude range, and about 70 mas at the limiting magnitude of R 16.
For up-to-date information on the project, see the UCAC web page at
http://ad.usno.navy.mil/ucac/ . This web page will also serve as the
location that the UCAC team will post addenda to the UCAC2 catalog.
The UCAC2 is a high density, highly accurate, astrometric catalog of
48,330,571 stars covering the sky from -90 to +40 degrees in
declination and going up to +52 degrees in some areas. The northern
limit is a function of right ascension. Proper motions and photometry
are provided for all stars. Positions and proper motions are on the
ICRS (International Celestial Reference System) and given at the epoch
J2000.0.
The UCAC2 has a number of major differences with respect to UCAC1.
These differences include:
- much larger sky coverage
- reduced systematic errors of CCD observations
- positions given at a standard epoch (J2000.0)
- the addition of several new catalogs for improved proper motions
- photometry in the J, H, and K_s bands from the 2MASS project
Additional details of the data are found in Sections 3, 4, and 5 of
the "readme.txt" file.
UCAC2 is the last intermediate data release before the final, all sky
catalog will be constructed. Observations will end around mid 2004;
the final catalog is expected out in 2005.
The UCAC project, observations, and first data release are described
in detail in the paper Zacharias et al. AJ 120, 2131 (2000). Versions
of that and other related papers are placed on the UCAC Web page
(http://ad.usno.navy.mil/ucac/). The paper describing UCAC2 is in
preparation (AJ, 2003); some further details can be found in the
"readme.txt" file.
Notice:
The data are freely available; however, any publication utilizing
these data should make proper reference to the project and papers.