Guide Star Catalog
(GSC, HSTGC, Hubble Space Telescope Guide Catalog)
(catalog of stars to help aim HST)
The Guide Star Catalog (GSC
or Hubble Space Telescope Guide Catalog or HSTGC)
is a catalog of stars compiled to help with
the use of the Hubble Space Telescope, to provide the locations
of recognizable stars to be used when refining the
aim at objects near these stars in the celestial sphere.
To make it so-usable for accurate aiming,
it favors stars over other astronomical objects,
and favors non-binary stars.
GSC-I has 20 million stars of magnitudes
6 through 15, and GSC-II has nearly a billion
to magnitude 21.
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