Web Directory

» 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

» GSC - The Online HST Guide Star Catalogue
   Provides access to the all-sky astrometric and photometric catalogue from the set of two CD-ROMs produced by the Space Telescope Science Institute through its Catalogs and Surveys Branch.
   http://arch-http.hq.eso.org/gsc/gsc-query2.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

» 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.
   http://ad.usno.navy.mil/wds/dsl.html

» The Hipparcos Catalogue
   A form that gives access to the catalogue of results from the Hipparcos mission.
   http://archive.ast.cam.ac.uk/hipp/hipparcos.html

» 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/

» 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 sufficie
   http://www.nofs.navy.mil/projects/pmm/catalogs.html