Astrometric Calibration Fields for the Sloan Digital Sky Survey (SDSS)

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

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 ~ 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 +/-50 mas, or better, in both coordinates and +/-0.03 mag in a passband similar to the Sloan r'-passband (lambda lambda 5600 - 7100 Angstroms). This paper describes the observations, reductions, and expected accuracies for the stars in these calibration regions.

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