Discoverer 18Rocket launchby USALaunch time7 Dec 196020:20:58 UTCsuccessOrbit: LEOSerial number: Thor 296MissionRocketPayloadsRocket ThorDM-21 Agena-Blaunched from Vandenberg AFB, LC-75-3-4USAPayloadsNamePurposeMassCommentDiscoverer 18Reconnaissance--