Discoverer 31Rocket launchby USALaunch time17 Sep 196121:00 UTCsuccessOrbit: LEOSerial number: Thor 324MissionRocketPayloadsRocket ThorDM-21 Agena-Blaunched from Vandenberg AFB, LC-75-1-1USAPayloadsNamePurposeMassCommentDiscoverer 31Reconnaissance--