Hubble Guide Star Catalog - Astrographic Catalog/Tycho

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The Hubble Guide Star Catalog - Astrographic Catalog/Tycho (GSC-ACT) is an astronomical catalogue. It contains the twenty million stars of the Hubble GSC, version 1.1, recalibrated using the U.S. Naval Observatory's ACT (Astrographic Catalog/Tycho). It is now considered obsolete, superseded by such catalogues as Tycho-2.

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