Progress 31Rocket launchby RussiaLaunch time3 Aug 198720:44:11 UTCsuccessOrbit: LEOMir Logistics.MissionRocketPayloadsDockingRocket SoyuzU2launched from Baikonur Cosmodrome, Pad 1/5KazakhstanPayloadsNamePurposeMassCommentProgress 31---Docking to Mir Docked5 Aug 1987 22:27:35 UTCUndocked21 Sep 1987 23:57:41 UTCDeorbited23 Sep 1987 01:02:00 UTC