Abstract
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 ±0.6 mas, and with proper motions consistent with an inertial system at the level of ±0.25 mas/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.
Original language | English |
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Pages (from-to) | L49-L52 |
Number of pages | 4 |
Journal | Astronomy and Astrophysics |
Volume | 323 |
Issue number | 1 |
Publication status | Published - 1997 |
Keywords
- Astrometry
- Catalogues
- Hipparcos
- Parallaxes
- Proper motions