The KH-4 (Keyhole-4) was fourth version in the Corona-program to build an optical reconnaissance satellite. KH-4 11 also carried the RM 3 radiometer payload for background measurements for the MIDAS program. August 29, 1962 at 01:00 UTC · Launch Successful Thor Agena D — United States Air Force, to Low Earth Orbit Space Launch Complex 2W, Vandenberg SFB, CA, USA The world's 192nd orbital launch attempt, and 50th of 1962. Data: Launch Library 2, The Space Devs. Image by USAF via The Space Devs.