Status Of Ucac And Urat Projects

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

All-sky observing of the USNO CCD Astrograph Catalog (UCAC) program was completed in 2004. Reductions are in progress for the final release (UCAC3) which is expected to be distributed in early 2007. It will contain positions and proper motions of about 60 million stars for the 10 to 16 magnitude range with errors of 15 to 70 mas per coordinate (depending on magnitude) in positions and 1 to 6 mas/yr for proper motions. Reduction details including double star fits, catalog completeness and empirical PSFs will be discussed, as well as the type of products required by various users. Yet unpublished data of over 5000 astrograph plates which are being measured on StarScan will be incorporated into UCAC proper motions.
The USNO Robotic Astrometric Telescope will enter construction phase in 2006. This dedicated 0.85m aperture instrument will perform an all-sky survey to give 30 mas positions at 20th magnitude as well as positions, proper motions and parallaxes on the 5-10 mas level for stars in the 14 to 18 mag range. The world's largest monolithic detector, a 10.6k by 10.6 CCD is currently in production with Semiconductor Technology Associates (STA) and a complete prototype camera is expected by end of 2006.

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