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Stellar and Astrometric Home : Space : Astronomy : Data Archives : Stellar and Astrometric Directory Listing(s) • 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 Space Astrometry Mission home page, site guide, research tools, news and results, the catalogues, education, visual results, further information, the future, animations. • 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!

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