KH-3 3 (Discoverer 31)

The KH-3, or Keyhole-3, represented the third iteration within the Corona program aimed at developing optical reconnaissance satellites, all launched under the Discoverer name. Enhanced with the C''' (Corona triple-prime) single panoramic camera, manufactured by Itek Corporation, the KH-3 payload offered improved imaging capabilities. With an f/3.5 aperture and a 61 cm focal length, the C'''-camera provided a ground resolution of 7.5 meters, enhancing image clarity. Operating atop the Agena-B upper stage for orbital maneuvering, the satellite facilitated attitude control during its mission. Upon completion, the film return capsule employed its own solid-fuel retro motor for deorbiting, with mid-air recovery facilitated by specialized aircraft.