Astrometric Properties of the HIPPARCOS Catalogue

Details Astrometric Properties of the HIPPARCOS Catalogue Astrometric Properties of the HIPPARCOS Catalogue

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997esasp.402....5m&link_type=abstract

Proceedings of the ESA Symposium `Hipparcos - Venice '97', 13-16 May, Venice, Italy, ESA SP-402 (July 1997), p. 5-10

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Scientific paper

The main statistical astrometric properties of the Hipparcos Catalogue are reviewed. This includes the overall figures useful to characterize the content of the Hipparcos Catalogue, meaningful for an average star of 9 mag. The formal errors of the five astrometric parameters are discussed in different coordinate systems as a function of the position on the sky and of the magnitude of the stars. While there is almost no sizeable effect with the ecliptic longitude, the formal errors of the ecliptic longitude and parallax display large variations with the ecliptic latitude. For the other coordinate systems the precision of all the astrometric parameters is a function of both positional coordinates. A more detailed investigation of the distribution of the parallaxes and their expected errors as a function of the magnitude and of the location of the star on the sky is also carried out with a particular emphasis on the relative error sigma_pi/pi.

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