Astronomy and Astrophysics – Astronomy
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000dda....31.1204h&link_type=abstract
American Astronomical Society, DDA Meeting #31, #12.04; Bulletin of the American Astronomical Society, Vol. 32, p.868
Astronomy and Astrophysics
Astronomy
Scientific paper
A CD-ROM has been produced with the first U.S. Naval Observatory CCD Astrograph Catalog (UCAC1). This is a high precision, astrometric catalog containing positions and proper motions for 27 million stars. About 80% of the Southern Hemisphere is covered by this preliminary catalog, observed at Cerro Tololo between February 1998 and November 1999. The precision of the catalog is about 20 mas for the 9 to 14th magnitude range and 70 mas at its limiting magnitude of r'=16. Proper motions were derived using the Tycho-2 including the AC data for the bright stars (r'<=12.5) and the USNO A2.0 for the fainter stars. The precision of the proper motions varies largely (2 to 30 mas/yr) mainly depending on the epoch difference to the first epoch data. External comparisons with Tycho-2 and the Yale Southern Proper Motion (SPM) 2.0 data reveal systematic errors to be only on the 10 mas level. The UCAC has a density (stars/square degree) exceeding that of the Guide Star Catalog (GSC) with a positional accuracy comparable to Tycho-1. UCAC positions of 10.5 to 12.5 magnitude stars are also much more precise than the Tycho-2 positions.
Holdenreid E.
Rafferty Theodore J.
Zacharias Marion I.
Zacharias Norbert
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