  The LSPM-north catalog is a comprehensive list of 61,977 stars north of the
J2000 celestial equator that have proper motions larger than 0.15 seconds of
arc per year (local-background-stars frame). The catalog has been generated
primarily as a result of our systematic search for high proper motion stars in
the Digitized Sky Surveys using our SUPERBLINK software. At brighter
magnitudes, the catalog incorporates stars and data from the Tycho-2 Catalogue
and also, to a lesser extent, from the All-sky Compiled Catalogue of 2.5
million stars. The LSPM catalog expands considerably over the old Luyten (LHS,
NLTT) catalogs, superseding them for northern declinations. Corrections to the
local-background-stars proper motions have been calculated, and absolute proper
motions in the extragalactic frame are given. The catalog is estimated to be
over 99% complete at high Galactic latitudes (|b>15|), and over 90% complete at
low Galactic latitudes (|b<15|), down to a magnitude V=19.0, and has a limiting
magnitude V=21.0. All the northern stars listed in the LHS and NLTT catalogs
have been re-identified, and their positions, proper motions and magnitudes
re-evaluated. The catalog also lists a large number of completely new objects,
which promise to expand very significantly the census of red dwarfs, subdwarfs,
and white dwarfs in the vicinity of the Sun.
