nonstar classifications were assigned by voting all available classifications from 15um scans, before applying the magnitude cutoff.
A significant expansion of the catalog, Guide Star Catalog II, was published in 2008. The Guide Star Catalog II (GSC-II) was compiled by the Catalog and Surveys branch of the Space Telescope Science Institute and the astrometry team of the Astronomical Observatory of Torino (Italy).
The new improved guide star catalogue II. It's a very big universe out there, and an astronomer's work is never done when it comes to simply counting and cataloging the sheer number of stars in the heavens. Completing a seven-year effort at digitizing the entire sky for a second time, astronomers at the Space Telescope
Oct 4, 2016 Description : The Guide Star Catalog II (GSC-II) is an all-sky optical catalog based on 1" resolution scans of the photographic Sky Survey plates, at two epochs and three bandpasses, from the Palomar and UK Schmidt telescopes. This all-sky catalog will ultimately contains positions, proper motions,
Apr 5, 2012 The Guide Star Catalog I (GSC I) is an all-sky optical catalog of positions and magnitudes of approximately 19 million stars and other objects in the 6th to 15th magnitude range. GSC I catalog is used for the control and target acquistion of the Hubble Space Telesope. The Guide Star Catalog II (GSC II) is an
The Guide Star Catalog has been constructed to support the operational need of the Hubble Space Telescope. It contains over 25 million positions for about 19 million objects, of which more than 15 million are classified as stars. The version 1.2 is a new astrometric reduction which results in absolute position errors about
The GSC-2.2 Telescope Operations early release of this catalog contains positions, classifications, and magnitudes for 998,402,801 objects. The final catalog could contain twice as many objects. It is based on one-arcsecond scans of two epochs and three bandpasses of Palomar and UK Schmidt telescopes which are also
Jul 16, 2008 Abstract: The GSC-II is an all-sky database of objects derived from the uncompressed DSS that the STScI has created from the Palomar and UK Schmidt survey plates and made available to the community. Like its predecessor (GSC-I), the GSC-II was primarily created to provide guide star information and
The Guide Star Catalog II (GSC II) is an all-sky catalog containing the positions, classifications and magnitudes of 435,457,355 objects. The catalog is derived from a 1" resolution scans of the photographic Sky Survey plates from the Palomar and UK Schmidt telescopes. The information contained in the GSC II is available

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February 2018