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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.
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.
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!
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. (September 27, 2007)
Last update:February 14, 2015 at 7:15:09 UTC