Astronomy and Astrophysics – Astronomy
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aj....127.3034m&link_type=abstract
The Astronomical Journal, Volume 127, Issue 5, pp. 3034-3042.
Astronomy and Astrophysics
Astronomy
135
Astrometry, Catalogs
Scientific paper
An improved proper-motion catalog is presented, combining the USNO-B and Sloan Digital Sky Survey (SDSS) catalogs in the area of sky covered by SDSS Data Release 1 (DR1; 2099 deg2). USNO-B positions are recalibrated using SDSS galaxies, and proper motions are recomputed including both the USNO-B and SDSS positions. Statistical errors in the USNO-B proper motions are decreased by roughly 20%-30%, systematic errors are greatly reduced, and the proper motions are placed on an absolute reference frame. Requiring a match to an SDSS object removes the large number of false high proper motion objects in USNO-B. The resultant catalog is 90% complete to g<19.7, with statistical errors in the component proper motions of roughly 3-3.5 mas yr-1, substantially smaller systematic errors, and a contamination rate of less than 0.5%. A number of studies are currently underway using proper motions from this catalog. The catalog is available via ftp.
Brinkmann John
Canzian Blaise
Harris Hugh C.
Hennessy Greg S.
Hindsley Robert B.
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