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. - http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=41375
The Hipparcos Space Astrometry Mission - European Space Agency's Hipparcos mission. Research tools, news, catalogues, education resources, and data. - http://www.rssd.esa.int/Hipparcos/
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 - http://ad.usno.navy.mil/wds/dsl.html
Catalog of White Dwarf Stars McCook and Sion - A catalog of spectroscopically identified white dwarf stars, by George P. McCook and Edward M. Sion - http://www.willbell.com/software/hypersky/wd1987.htm
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. - http://adc.gsfc.nasa.gov/adc/adc_cat1_holdings.html
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. - http://stellar.phys.appstate.edu
The 50 Nearest Stars - Table with details about the 50 nearest stars. Names, distances, constellations, spectral types, magnitudes and coordinates. - http://www.cosmobrain.com/cosmobrain/res/nearstar.html
White Dwarf Database - An electronic database of the white dwarf stars. - http://procyon.lpl.arizona.edu/WD/
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 suffici - http://www.nofs.navy.mil/projects/pmm/catalogs.html