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USNO Bright Star Catalog (UBSC) is a new astrometric catalog of 1423brightest stars covering the entire sky, which is published online. It isnearly complete to $V=3$ mag except for three stellar systems. A combinedastrometric solution of the Hipparcos Intermediate Astrometry Data and twodedicated ground-based campaigns in 2013 -- 2020 is the basis for this catalog.The astrometric parameters for each star include position coordinates,parallax, proper motion components, and their covariances on the Hipparcos meanepoch 1991.25. 64 percent of the catalog are flagged as known or suspecteddouble or binary stars. UBSC lists 68 stars missing in Gaia EDR3 and another114 stars without Gaia parallaxes or proper motions. The formal precisionachieved for proper motions is comparable to that of Gaia.

USNO Bright Star Catalog, version 1