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Guide Star Catalog

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The Guide Star Catalog (GSC) is also known as the Hubble Space Telescope, Guide Catalog (HSTGC). It is a star catalogue built to support the Hubble Space Telescope with targetting off-axis stars. It containas approximately 20,000,000 celestial bodies with apparent magnitudes of 6 to 15.

When quoting a catalog entry, typically you write GSC FFFFF-NNNNN, or alternately, GSCfffff0nnnnn (fffff0nnnnn). The F-sequence references a Hubble sky region code.

See also

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