Hipparcos
Space mission
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Hipparcos was a scientific satellite of the European Space Agency, launched in 1989 and operated until 1993. It was the first space experiment devoted to precision astrometry, the accurate measurement of the positions of celestial objects on the... Wikipedia
Launch date: 8 August 1989, 23:25:53 UTC
Apogee altitude: 35,797.5 km (22,243.5 mi)
Band: S-Band
COSPAR ID: 1989-062B
Dry mass: 635 kg (1,400 lb)
Focal length: 1.4 m (4 ft 7 in)
Mission duration: 2.5 years (planned); 4 years (achieved)