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,
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 will replace GSC-I for HST pointing in
cycle 15. 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
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