Data Archives Stellar and Astrometric
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Astrometric holdings in ADC Archives - Data sets in the Astronomical Data Center's Astrometric, and Positional data holdings. Contains site map, science data, news, and feedback.
Catalog of White Dwarf Stars McCook and Sion - A catalog of spectroscopically identified white dwarf stars, by George P. McCook and Edward M. Sion
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 - European Space Agency's Hipparcos mission. Research tools, news, catalogues, education resources, and data.
The 50 Nearest Stars - Table with details about the 50 nearest stars. Names, distances, constellations, spectral types, magnitudes and coordinates.
Nstars Online Spectra - A spectroscopic survey of 3600 nearby stars within 40pcs earlier than M0. Contains real-time spectral plots, and coordinate lists. Also MK standards.
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!
White Dwarf Database - An electronic database of the white dwarf 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) Help build the largest human-edited directory on the web.