Soyuz 20Rocket launchby RussiaLaunch time17 Nov 197514:36 UTCsuccessOrbit: LEOUnmanned long-duration test of Soyuz spacecraft.Docked with Salyut 4.MissionRocketPayloadsDockingLandingRocket SoyuzUlaunched from Baikonur Cosmodrome, Pad 1/5KazakhstanPayloadsNamePurposeMassCommentSoyuz 20---Docking to Salyut 4 DockedAs plannedSpacecraft landingDate16 Feb 1976