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EXOSAT

Spacecraft
The European X-ray Observatory Satellite, originally named HELOS, was an X-ray telescope operational from May 1983 until April 1986 and in that time made 1780 observations in the X-ray band of most ... Wikipedia
Launch date: May 26, 1983
Decay date: 5 May 1986
Mission duration: 3 years
Power: 165.0 watts
Reference system: Geocentric