Four re-entry vehicles were carried on most missions, with a fifth added for missions that included a mapping camera.īetween September 1966 and July 1967, the contractors for the Hexagon subsystems were selected.
The photographic film from the cameras was sent to recoverable re-entry vehicles and returned to earth, where the capsules were caught in mid-air by an aircraft. The KH-9 carried two main cameras, although a mapping camera was also carried on several missions. The goal was to search large areas of the earth with a medium resolution camera.
The KH-9 was originally conceived in the early 1960s as a replacement for the Corona search satellites.
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