KH-4 12 [USAF]
The KH-4 (Keyhole-4) was fourth version in the Corona-program to build an optical reconnaissance satellite. Only the first two satellites were launched under the name Discoverer, before this designation was dropped.
The KH-4 payload introduced a second camera to provide stereoscopic imaging. The Corona-M or Mural camera consisted of two C''' (Corona triple-prime) cameras inherited from KH-3. The cameras were mounted with 30 degrees separation angle. The two cameras are referred to as fore (for forward looking) and aft (for rear looking). An additional index camera was also carried. The Film was returned by a single General Electric return vehicle (SRV, Satellite Return Vehicle). The Mural-camera was built by Itek Corporation and had a ground resolution of 3.6 - 5.1 m.
The satellite was based on the Agena-B upper stage, which provided attitude control in orbit. The film return capsule carried its own small solid-fuel retro motor to deorbit at the end of the mission with mid-air recovery of the returning capsule by a specially equipped aircraft.
Some missions featured piggy-back payloads, which remained connected to the Agena-B stage.
Later KH-4 missions were based on the Agena-D stage.
|Type / Application:||Reconnaissance, photo (film return type)|
|Equipment:||Mural-camera, index camera|
|Configuration:||Agena-B, 1 SRV|
|Propulsion:||Bell 8081, Star-12 retro motor|
|Mass:||~1200 kg (incl. Agena stage)|
|KH-4 1 (Corona 38, Mission 9031, Discoverer 38, Wild Bill 1)||1962 ε 1||27.02.1962||Va 75-3-4||Thor-DM21 Agena-B|
|KH-4 2 (Corona 39, Mission 9032, Discoverer 39, Grape Juice 2)||1962 λ 1||18.04.1962||Va 75-3-5||Thor-DM21 Agena-B|
|KH-4 3 (Corona 40, Mission 9033)||1962 ρ 1||29.04.1962||Va 75-3-4||Thor-DM21 Agena-B|
|KH-4 4 (Corona 42, Mission 9035)||1962 φ 1||30.05.1962||Va 75-1-1||Thor-DM21 Agena-B|
|KH-4 5 (Corona 43, Mission 9036)||1962 χ 1||02.06.1962||Va 75-3-4||Thor-DM21 Agena-B||with OSCAR 2|
|KH-4 6 (Corona 44, Mission 9037)||1962 αβ||23.06.1962||Va 75-3-4||Thor-DM21 Agena-B|
|KH-4 8 (Corona 46, Mission 9039)||1962 αη||21.07.1962||Va 75-3-5||Thor-DM21 Agena-B|
|KH-4 9 (Corona 47, Mission 9040, New Jersey 1)||1962 αθ||28.07.1962||Va 75-3-4||Thor-DM21 Agena-B|
|KH-4 12 (Corona 51, Mission 9043, Grape Juice 3)||1962 αχ||17.09.1962||Va 75-3-4||Thor-DM21 Agena-B||with TRS 2|
|KH-4 14 (Corona 55, Mission 9047)||1962 βο||05.11.1962||Va 75-3-4||Thor-DM21 Agena-B|
|KH-4 15 (Corona 56, Mission 9048, Plymouth Rock 1)||1962 βρ||24.11.1962||Va 75-3-4||Thor-DM21 Agena-B|
Further KH missions:
Further Discoverer missions:
Further Corona missions:
Further Aftrack SIGINT missions: