The Southern Proper Motion Program IV. The SPM4 Catalog

Details The Southern Proper Motion Program IV. The SPM4 Catalog The Southern Proper Motion Program IV. The SPM4 Catalog

2011-04-29

arxiv.org/abs/1104.5708v2

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

34 pages, 8 figures, 3 tables; accepted for publication in AJ; note - modified author list and acknowledgements section

Scientific paper

We present the fourth installment of the Yale/San Juan Southern Proper Motion Catalog, SPM4. The SPM4 contains absolute proper motions, celestial coordinates, and (B,V) photometry for over 103 million stars and galaxies between the south celestial pole and -20 deg declination. The catalog is roughly complete to V=17.5 and is based on photographic and CCD observations taken with the Yale Southern Observatory's double-astrograph at Cesco Observatory in El Leoncito, Argentina. The proper-motion precision, for well-measured stars, is estimated to be 2 to 3 mas/yr, depending on the type of second-epoch material. At the bright end, proper motions are on the International Celestial Reference System by way of Hipparcos Catalog stars, while the faint end is anchored to the inertial system using external galaxies. Systematic uncertainties in the absolute proper motions are on the order of 1 mas/yr.

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