Soyuz 35

Mission details:

• On April 9, 1980, the Soyuz-35 manned spacecraft was launched from the Baikonur Cosmodrome under the program of the fourth main expedition (EO-4) of the Salyut-6 long-term orbital station (DOS). The mission of Leonid Popov and Valery Ryumin became a record for the duration of their stay in Earth orbit and provided a unique experience of long-term human work in space conditions.
• The day after the launch, the Soyuz-35 spacecraft docked with Progress 8-Salyut 6 (lst airlock) on 1980 Apr 10.64.
• Carried crew comprising L I Popov and V V Ryumin to the Salyut-6 station to carry out scientific and technical research, biomedical experiments, and remote sensing of the Earth.
• During the 185-day flight, long-lived astronauts with the call sign "Dnepr" received three Progress automatic cargo ships and the first manned spacecraft of the new Soyuz T-2 modification. During the operation of EO-4, the international crews of three visiting expeditions under the Intercosmos program attended by the first cosmonauts of Hungary, Cuba and Vietnam visited the Salyut-6 spacecraft. At the same time, the flight engineer of the main expedition Valery Ryumin set an individual 362-day record for the total duration of stay in space for the total time of his flights.
• docking of Soyuz 35 on 26.05.1980, of new developed spacecraft Soyuz T2 on 05.06.1989 , Soyuz 37 on 24.07.1980 and Soyuz 38 on 19.09.1980; supplies with cargo spacecrafts Progress 8 - 11.
• The Soyuz 35 cosmonauts remained aboard Salyut and the Soyuz 35 spacecraft returned with Soyuz 36 crew.
  On October 11, 1980, Leonid Popov and Valery Ryumin returned to Earth, successfully completing the flight program.
• Recovered June 3, 1980 15:07 GMT. Landed 140 km SE Dzehezkazgan.

Popov and Ryumin

Astrophilately covers:

Launch cancel Baikonur, signed by crew.

Cancel Baikonur 26-5-80 bord letter.

Undocking cancel Baikonur, signed by Kubassov.