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The Flagstaff Astrometric Scanning Transit Telescope (FASTT) and Star Positions Determined in the Extragalactic Reference Frame

Monet, Alice K. B.; Monet, David G.; Stone, Ronald C. +2 more

This paper describes the methods used for determining star positions in the extragalactic reference frame with the Flagstaff astrometric scanning transit telescope (FASTT) from drift scan observations. A laser metrology system is used to correct for instrumental motions, and detailed numerical computations are made for atmospheric and room refract…

The Twin Astrographic Catalog (TAC) Version 1.0

Zacharias, N.; Wycoff, G. L.; Zacharias, M. I. +1 more

A first version of the Twin Astrographic Catalog (TAC) of positions for 705,679 stars within -18°≤δ≤90° has been produced. The sky coverage of the TAC is complete to over 90% in that area. The limiting magnitude is about B =12.0. Positions are based on 4912 plates taken with the U.S. Naval Observatory Twin Astrograph (blue, yellow lens) at epochs …