KH-9 Hexagon
Spacecraft
KH-9, commonly known as Big Bird or KeyHole-9, was a series of photographic reconnaissance satellites launched by the United States between 1971 and 1986. Of twenty launch attempts by the National Reconnaissance Office, all but one were... Wikipedia
Perigee altitude: 170 km (110 mi)
Diameter: 0.91 m (3 ft 0 in)
Dimensions: 16.2 m × 3.05 m (53.1 ft × 10.0 ft)
Focal ratio: f/3.0
Launch mass: 11400 kg to 13300 kg (with mapping camera)
Reference system: Sun-synchronous orbit
Rocket: Titan III