The first year of the UCAC-S project

Details The first year of the UCAC-S project The first year of the UCAC-S project

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999dda....31.1005z&link_type=abstract

American Astronomical Society, DDA meeting #31, #10.05

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Scientific paper

The US Naval Observatory CCD Astrograph Catalog South astrometric survey started in February 1998 at the Cerro Tololo site. By March 1999, 50% of the Southern Hemisphere was covered in a 2-fold overlap pattern, in a single bandpass (579-642 nm), using the 5-element 20cm aperture f/10 "red" lens and a Kodak 4k by 4k CCD. The goal is to produce accurate positions (20 mas for stars in the 8 to 14 mag range, 70 mas at 16 mag) on the Hipparcos system. It is planned to release some preliminary results from the first year of observing by mid 1999. Proper motions for stars brighter than V=12 will be derived by combining the UCAC positions with those in the Astrographic Catalogue and 160 other photographic and transit circle catalogs, all of which are reduced to the Hipparcos system. This work is also the basis for a collaboration with Copenhagen University Observatory to determine the proper motions of the stars in the upcoming Tycho-2 Catalogue, due out at the end of 1999. For stars fainter than V=12, the proper motions will be derived by combining the UCAC positions with those in the USNO A-2.0 catalog.

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