The U.S. Naval Observatory SA1.0 is a catalog of 54,787,624 sources intended
to provide a grid of astrometric reference objects over the whole sky.
It is a spatially sub-sampled version of
which provides an astrometric reference catalog for asteroid hunters and
other folks who do not need all of that 10-CDROM, 488,006,860-source catalog.
The format is the same as USNO-A1.0.
USNO-SA 1.0 Astrometric Reference Catalog
This catalog has been replaced by the
USNO-SA 2.0 Catalog.
and is no longer distributed.
Catalog access software in C for
Unix systems has been written by
Jessica Mink at the
Harvard-Smithsonian Center for Astrophysics.
to the USNO reference catalogs is available through
Where catalog access software for UNIX and MS-DOS has been written by
Source (FORTRAN) and executable (MS-DOS only) code are available.
[[WCSTools UAC Programs]