Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aspc..317..206g&link_type=abstract
Milky Way Surveys: The Structure and Evolution of our Galaxy, Proceedings of ASP Conference #317. The 5th Boston University Ast
Astronomy and Astrophysics
Astrophysics
Scientific paper
We present the third installment of the Yale/San Juan Southern Proper Motion Catalog, SPM3. Absolute proper motions, positions and photographic B,V photometry are given for roughly 10.7 million objects, down to a magnitude of V=17.5. The Catalog covers an irregular area of 3700 square degrees, between declinations of -22° and -45°, excluding the Galactic plane. The precision of proper motions for well-measured stars is estimated to be 4.0 mas/yr. Unlike previous releases of the SPM catalog, the proper motions are on the International Celestial Reference System by way of Hipparcos Catalog stars and have an estimated systematic uncertainty of 0.4 mas/yr. An important advantage of this and previous SPM catalogs over other photographically-based proper-motion catalogs is the inclusion of an explicit correction for the magnitude equation, the magnitude-dependent systematic shift in image position that afflicts all photographic material.
Dinescu Dana I.
Girard Terrence M.
Lopez Carlos E. E.
Monet David G.
Platais Imants
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