The Double Star Library - The Double Star Library hopes to be a means by which various types of binary and multiple star information can be easily disseminated among binary star astronomers in IAU Commission 26 and related commissions.
USNO PMM Star Catalogs - USNO is making the USNO-SA2.0 catalog (54,787,624 stars in all on one CD-ROM) available for free. The full USNO-A2.0 catalog (526,230,881 stars on 10 CD-ROMs) is also available provided you can provide a brief explanation of why USNO-SA2.0 is not sufficient. That's information on over half a billion stars!
The Hipparcos Catalogue - A form that gives access to the catalogue of results from the Hipparcos mission.
The Hipparcos Space Astrometry Mission - European Space Agency's Hipparcos mission. Research tools, news, catalogues, education resources, and data.
A New Reduction of the Hipparcos Catalogues - ESA announcement of a recalculation of the data which improves accuracy by compensating for systematic errors of thermal and micrometeoritic origin.
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