Tycho-2 Catalog

From: Brierley David (DMBRIERLEY@dera.gov.uk)
Date: Mon Feb 14 2000 - 01:47:32 PST

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    Dear SeeSaters
    For those of you who haven't heard, the Tycho data from the ESA
    Hipparcos satellite has been reprocessed, resulting in a new catalogue
    called Tycho-2 containing the positions and magnitudes of 2,539,913
    stars.  It is claimed to have a cleaner cutoff than the first Tycho
    catalogue, at around mag +11.5.  It comes on a CD-ROM in one
    uncompressed file of 515Mb.
    Proper motions have been derived from a new analysis of no fewer than
    144 ground-based catalogues.
    The documentation that came with my CD-ROM tells me that the catalogue
    can be retrieved from CDS through anaonymous ftp, and can be queried
    using the VizieR service at
    <http://vizier.u-strasbg.fr/cgi-bin/VizierR?-source=Tycho2>.  It is also
    available from the Aladin interactive sky atlas
    <http://aladin.u-strasbg.fr/> or through the ESO skycat tool
    It has its own website at <http://astro.ku.dk/~erik/Tycho-2>.
    Regards to all
    David M Brierley
    Malvern, Worcestershire, UK
    Station 2675, 52.1358N 2.3264W 70m
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