Soyuz 39 COSPAR ID 1981-029A[1] SATCAT no. 12366[1] Mission duration 7 days, 20 hours, 42 minutes, 3 seconds Orbits completed 124 Spacecraft properties Spacecraft type Soyuz 7K-T Manufacturer NPO Energia Launch mass 6,800 kilograms (15,000 lb) Crew Crew size 2 Members Vladimir Dzhanibekov Jügderdemidiin Gürragchaa Callsign Pamir (Pamirs) Start of mission Launch date 22 March 1981, 14:58:55 (1981-03-22UTC14:58:55Z) UTC Rocket Soyuz-U Launch site Baikonur 1/5 End of mission Landing date 30 March 1981, 11:40:58 (1981-03-30UTC11:40:59Z) UTC Landing site 175 km SE of Dzhezkazgan Orbital parameters Reference system Geocentric Regime Low Earth Perigee 197.5 kilometres (122.7 mi) Apogee 282.8 kilometres (175.7 mi) Inclination 51.6 degrees Period 89.1 minutes Docking with Salyut 6 Soyuz programme (Manned missions)