Proper‐Motion Catalog from SDSS ∩ USNO‐B
- 1 May 2004
- journal article
- research article
- Published by American Astronomical Society in The Astrophysical Journal Supplement Series
- Vol. 152 (1) , 103-111
- https://doi.org/10.1086/382529
Abstract
We present a catalog of 345,000 stars with proper motions � ≥ 20masyr−1 and magnitudes r' ≤ 20, drawn from the intersection of the SDSS Data Release One and USNO-B. We first use SDSS quasars to correct the proper motions in each of the two source catalogs, finding that these corrections for systematics are comparable to the statistical errors. The combined proper motions have errors of σµ = 4.0masyr−1, significantly better than any previous catalog at these magni- tudes. While cross-correlating SDSS and USNO-B removes the vast majority of the very large number of spurious proper-motion stars in each, some contamina- tion remains, especially at faint magnitudes, r' & 19.5, and high proper motions. We present a diagrammatic method to estimate the level of contamination in selected subsets of the catalog, which should be useful for choosing appropriate selection criteria for various applications.Keywords
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