Discoverer 21Rocket launchby USALaunch time18 Feb 196122:58 UTCsuccessOrbit: LEOSerial number: Thor 261MissionRocketPayloadsRocket ThorDM-21 Agena-Blaunched from Vandenberg AFB, LC-75-3-5USAPayloadsNamePurposeMassCommentDiscoverer 21Technology--