 | |
| Operator | Soviet space program |
|---|---|
| COSPAR ID | 1980-027A |
| SATCAT no. | 11753 |
| Mission duration | Capsule: 55 days, 1 hour and 28 minutes Original crew: 184 days, 20 hours, 11 minutes |
| Spacecraft properties | |
| Spacecraft type | Soyuz 7K-T |
| Manufacturer | NPO Energia |
| Launch mass | 6,800 kg (15,000 lb) |
| Crew | |
| Crew size | 2 |
| Launching | Leonid Popov Valery Ryumin |
| Landing | Valery Kubasov Bertalan Farkas |
| Callsign | Днепр (Dnepr – Dnieper) |
| Start of mission | |
| Launch date | April 9, 1980, 13:38:22 UTC |
| Rocket | Soyuz-U |
| Launch site | Baikonur 31/6 |
| End of mission | |
| Landing date | June 3, 1980, 15:06:23 UTC |
| Landing site | 180 km (110 mi) SE of Dzhezkazgan |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Low Earth |
| Perigee altitude | 198 km (123 mi) |
| Apogee altitude | 259.7 km (161.4 mi) |
| Inclination | 51.65 degrees |
| Period | 88.81 minutes |
| Docking with Salyut 6[1] | |
| Docking port | Front |
| Docking date | April 10, 1980, 15:15:32 UTC |
| Undocking date | June 3, 1980, 11:50 UTC |
| Time docked | 53 days, 20 hours and 34 minutes |
 Soviet stamp featuring Popov and Ryumin (1981) | |
Soyuz 35 (Russian: Союз 35, Union 35) was a 1980 Soviet crewed space flight to the Salyut 6 space station. It was the 10th mission to and eighth successful docking at the orbiting facility. The Soyuz 35 crew were the fourth long-duration crew to man the space station.[1]
Cosmonauts Leonid Popov and Valery Ryumin spent 185 days in space, setting a new space endurance record. Ryumin had completed a previous mission only eight months before. They hosted four visiting crews, including the first Hungarian, Cuban and Vietnamese cosmonauts.
As long-duration crews now routinely swapped spacecraft with incoming crew, the Soyuz 35 craft was used to return the visiting Soyuz 36 crew to Earth, while the resident crew returned in Soyuz 37.