Abstract
This paper examines a subset of objects from the USNO-B1 catalog with listed proper motions between 10 and 50 yr-1. We look at the degree of contamination within this range of proper motions and point out the major sources of spurious high proper motion objects. Roughly 0.1% of the objects in the USNO-B1 catalog with listed motions between 10 and 50 yr-1 are real. Comparison with the revised version of Luyten's Half-Second Catalogue indicates that USNO-B1 is only about 47% complete for stars in this range. Preliminary studies indicate that there may be a dip in completeness in USNO-B1 for objects with motions near 01 yr-1. We also present two new stars with motions between 10 and 50 yr-1, 36 new stars with confirmed motions between 01 and 10 yr-1, several new common proper motion pairs, and the recovery of LHS 237a (VBs3).
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