  URAT1 is an observational, astrometric catalog covering most of the Dec >=
-15 deg area and a magnitude range of about R = 3 to 18.5. Accurate positions
(typically 10 to 30 mas standard error) are given for over 228 million objects
at a mean epoch around 2013.5. For the over 188 million objects matched with
the 2MASS point source catalog proper motions (typically 5 to 7 mas/yr std.
errors) are provided. These data are supplemented by 2MASS and APASS
photometry. Observations, reductions and catalog construction are described
together with results from external data verifications. The catalog data are
served by CDS, Starsbourg (I/329). There is no DVD release.
