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Yohkoh

Spacecraft
Yohkoh, known before launch as Solar-A, was a Solar observatory spacecraft of the Institute of Space and Astronautical Science, in collaboration with space agencies in the United States and the United Kingdom. It was launched into Earth orbit on... Wikipedia
Launch date: August 30, 1991
Orbit height: 401 mi
Launch mass: 390 kilograms (860 lb)
Mission duration: 10 years, 3 months and 14 days (achieved)