| Launch Date | 8 August 1989 | | Decommission Date | 15 August 1993 | | Stars Catalogued | Hipparcos: 118,218
Tycho: 1,058,332
Tycho-2: 2,539,913 | | Brightest Star catalogued | Sirius in Canis Major (HIP 32349) | | Notes | The name 'Hipparcos' is derived from the mission's fuller title of High Precision Parallax Collecting Satellite. Over a period of just over five years, this satellite collected detailed astrometric data for over a hundred thousand stars. Data from the resulting detailed catalogue uses the 'HIP' prefix to identify catalogue numbers for Hipparcos stars, and 'TYC' for the more extensive but less detailed Tycho catalogues. |
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