The KH-4 (Keyhole-4) was fourth version in the Corona-program to build an optical reconnaissance satellite. KH-4 24 also carried the RM 5 radiometer payload for background measurements for the MIDAS program. November 9, 1963 at 20:27 UTC · Launch Failure Thor SLV-2 Agena D — United States Air Force, to Low Earth Orbit Space Launch Complex 2W, Vandenberg SFB, CA, USA The world's 280th orbital launch attempt, and 56th of 1963. Data: Launch Library 2, The Space Devs. Image by USAF via The Space Devs.