Progress 21Rocket launchby RussiaLaunch time7 May 198422:47:15 UTCsuccessOrbit: LEOSalyut 7 Logistics.MissionRocketPayloadsDockingRocket SoyuzUlaunched from Baikonur Cosmodrome, Pad 31/6KazakhstanPayloadsNamePurposeMassCommentProgress 21---Docking to Salyut 7 Docked10 May 1984 00:10:00 UTCUndocked26 May 1984 09:41:00 UTCDeorbited26 May 1984 15:00:30 UTC