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Last Updated Jan 2001
Copyright © 2001 The Association of Universities for Research in Astronomy, Inc. All Rights Reserved.
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The Guide Star Photometric Catalog (GSPC-I) is an all-sky set of 1477 photo-electrically determined BV sequences covering the magnitude range from 9 to 15. The GSPC was created to provide photometric calibrators for the Guide Star Catalog (GSC-I), which is a catalog of approximately 19 million stars and objects classified as non-stars needed to support the pointing of the Hubble Space Telescope. GSPC-I sequences nominally contain (at least) six stars, each with a photometric precision of 0.05 mag. In practice, a small number of sequences contains fewer stars, and the precisions achieved for the faintest stars are more nearly 0.1 mag. For more information about GSPC-I, go to the paper by Lasker, Sturch, et al., Ap. J. Supplement, Vol. 68, 1988 . To view data from an enhanced version of GSPC-I, go to the ADC catalog.
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