The HIPPARCOS Catalogue

Details The HIPPARCOS Catalogue The HIPPARCOS Catalogue

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...323l..49p&link_type=abstract

Astronomy and Astrophysics 323, L49-L52

Astronomy and Astrophysics

Astrophysics

1472

Scientific paper

The principal observational characteristics of the Hipparcos Catalogue, and a summary of its main astrometric and photometric properties, are presented. Median astrometric standard errors (in position, parallax, and annual proper motion) are in the range 0.7-0.9 milliarcsec (mas) for stars brighter than 9 mag at the catalogue epoch (J1991.25). The catalogue is a materialisation of the ICRS reference system, coinciding with its principal axes at the level of +/-0.6mas, and with proper motions consistent with an inertial system at the level of +/-0.25mas/yr. The 118218 constituent stars provide a mean sky density of ~3 stars/deg^2^. The catalogue is available in printed and machine-readable forms.

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