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N. Zacharias (USNO), M.I. Zacharias (USRA / USNO), S.E. Urban, T.J. Rafferty (USNO)
The U.S. Naval Observatory (USNO) CCD Astrograph Catalog (UCAC) project started observations of the southern sky in February 1998 from the Cerro Tololo Inter-American Observatory (CTIO). The last observing night at CTIO was 18/19 September 2001 and the telescope has now relocated to the USNO station in Flagstaff, AZ to complete the northern sky.
A catalog of positions of about 40 million stars (8 to 16 mag) is being constructed based on all survey observations obtained at CTIO, with coverage from the south pole north to between +24 and +31 degrees declination, depending on the right ascension. Depending on magnitude, the positional accuracy is between 20 and 70 mas at mean epoch. Proper motions are being provided utilizing the Southern Proper Motion (SPM) first epoch and other catalog data (1 to 5 mas/yr).
The UCAC2 will become available on 2 CD-ROMs in early 2002 and will supersede the UCAC1. Internal UCAC releases are already in use with the Sloan (SDSS) and 2MASS projects and for minor planet occulation predictions. The final UCAC will be the basis for the SIM input catalog.
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The author(s) of this abstract have provided an email address for comments about the abstract: nz@pisces.usno.navy.mil