Guide Star Catalog

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Guide Star Catalog

A catalog of celestial objects, mainly stars, compiled at the Space Telescope Science Institute during the early 1980s. It served as the database for the sensitive guidance system of the Hubble Space Telescope. In its earliest published form, Version 1.2, it contained the positions of about 19 million objects, including some of the 16th magnitude. It was superseded by Version 2.2, which contained the positions for 435 million celestial objects down to the 19th magnitude. The Guide Star Catalog was compiled from the analysis of photographic plates and contains no proper motions. It is available on CD-ROM.
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