Guide Star Catalog 2.3 Cone Search

Published by MAST: Mikulski Archive at Space Telescope | National Aeronautics and Space Administration | Metadata Last Checked: September 14, 2025 | Last Modified: 2025-09-10

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, classifications, and magnitudes in multiple bandpasses for almost a billion objects down to approximately Jpg=21, Fpg=20. The GSC-II is currently used for HST Bright Object Protection and HST pointing. Looking ahead, the GSC-II will form the basis of the Guide Star Catalog for JWST. This was constructed in collaboration with ground-based observatories for use with the GEMINI, VLT and GALILEO telescopes

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Complete Metadata

bureauCode	[ "026:00" ]
identifier	ivo://archive.stsci.edu/gsc/gsc2.3
landingPage	http://gsss.stsci.edu/Catalogs/GSC/GSC2/GSC2.htm
programCode	[ "026:000" ]
theme	[ "Astrophysics" ]