The TYCHO Catalogue: Astrometry and Photometry

Details The TYCHO Catalogue: Astrometry and Photometry The TYCHO Catalogue: Astrometry and Photometry

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997esasp.402...25h&link_type=abstract

Proceedings of the ESA Symposium `Hipparcos - Venice '97', 13-16 May, Venice, Italy, ESA SP-402 (July 1997), p. 25-30

Astronomy and Astrophysics

Astronomy

9

Scientific paper

The Tycho Catalogue of a million stars is described. The median value of the internal standard errors is 25 mas for the position components and 0.10 mag for the B_T - V_T colour index. For stars brighter than V_T=9 mag the median precision is 7 mas and 0.019 mag, respectively. The external astrometric standard errors have been determined by comparison with the Hipparcos Catalogue and are respectively 1.1 and 1.5 times larger for V_T < 10 mag and at V_T =10.5 mag. The photon counts from the Hipparcos star mapper were the basic data used to derive the Tycho Catalogue. This large data set of about 100 Gigabytes could not be fully exploited in the first reduction. A second data reduction has therefore been started, based on the Tycho Catalogue and the experience gained, and utilizing more powerful computing facilities. This is expected to result in a second Tycho Catalogue of about 3 million stars.

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