The Hubble Guide Star Catalog - Astrographic Catalog/Tycho (GSC-ACT) is an
External links
* [http://www.projectpluto.com/gsc_act.htm Overview of the GSC-ACT]
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Guide Star Catalog — 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 targeting off axis stars. It contains approximately 20,000,000 celestial… … Wikipedia
Star catalogue — An illustration of the Perseus constellation (after Perseus from Greek mythology) from the star catalogue published by the German astronomer Johannes Hevelius in 1690 A star catalogue, or star catalog, is an astronomical catalogue that lists… … Wikipedia
List of astronomy acronyms — This is a compilation of acronyms commonly used in astronomy. Most of the acronyms are drawn from professional astronomy and are used quite frequently in scientific publications. However, a few of these acronyms are frequently used by the general … Wikipedia
