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Zacharias N.,Us Naval Observatory | Finch C.,Us Naval Observatory | Subasavage J.,Us Naval Observatory Flagstaff Stationaz | Bredthauer G.,Semiconductor Technology Associates | And 12 more authors.
Astronomical Journal | Year: 2015

URAT1 is an observational, astrometric catalog covering most of the δ -15° area and a magnitude range of about R = 3-18.5. Accurate positions (typically 10-30 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 Two Micron All Sky Survey (2MASS) point-source catalog proper motions (typically 5-7 mas yr-1 standard errors) are provided. These data are supplemented by 2MASS and AAVSO Photometric All-Sky Survey (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). © 2015. The American Astronomical Society. All rights reserved..

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