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Session 74 - Ground-Based Instruments.
Display session, Wednesday, January 17
North Banquet Hall, Convention Center
The Flagstaff Astrometric Scanning Transit Telescope (FASTT) is observing 16 regions spaced around the celestial equator that will be used to astrometrically calibrate the large CCD array in the Sloan 2.5m telescope during its survey (Gunn and Knapp 1993, ASP Conf. Series 43, p267). Each region is about 7.5^o by 3.2^o and includes many thousands of stars in the magnitude range V \sim 10 to 17. All regions are being observed repeatedly in scan mode with a Loral 2048^2 CCD with center-to-edge overlapping scans with the FASTT. The project is nearing completion, and the expected accuracy for the star positions is \pm50 mas, or better, in both coordinates and \pm0.03 mag in a passband similar to the Sloan r'-passband (\lambda\lambda5600 - 7100ÅThis paper describes the observations, reductions, and expected accuracies for the stars in these calibration regions.
