Advanced Satellite for Cosmology and Astrophysics
The Advanced Satellite for Cosmology and Astrophysics was the fourth cosmic X-ray astronomy mission by JAXA, and the second for which the United States provided part of the scientific payload. The satellite was successfully launched on 20 February... Wikipedia
Start date: February 20, 1993
Focal length: 3.5 m (11 ft)
Launch mass: 420 kg (930 lb)
Mission duration: Final: 8 years, 10 days