Soyuz 18

Soyuz 18 mission is the designation for the flight of a Soviet Soyuz spacecraft to the Soviet space station Salyut 4 This was the second visit of a Soyuz spacecraft in this space station and the 34th flight in the Soviet Sojusprogramm.

  • 3.1 orbit data from Salyut 4 at the time of coupling


  • Pyotr Ilyich Klimuk ( second space flight), Commander
  • Vitaly Ivanovich Sevastyanov ( second space flight), flight engineer

Sevastyanov and Klimuk were previously the backup crew for the flight, which should start under the name Soyuz 18 actually, but was still broken in the starting phase. This flight was no official number and is often performed in a Soyuz 18-1.

Backup crew

  • Vladimir Vasilyevich Kovalyonok, Commander
  • Yuri Anatoljevich Ponomarev, Flight Engineer

Mission overview

After the failure of the flight Soyuz 18-1 the continuation of the work was with the Space Station in the foreground. Focus was primarily medical-biological experiments ( from 29 to nearly 63 days) were related to the extension of the flight duration. In addition, the Earth and atmospheric shots as well as the astrophysical investigations were continued. During the flight of Soyuz 18 and the Apollo -Soyuz project took place. During this time seven astronauts were in space at the same time.

Flight data

The parameters given here are the published data immediately after the start-up phase dar. In connection with coupling maneuvers it comes to continuously track changes. Deviations from information provided by various sources are possible.

Path data from Salyut 4 at the time of coupling

  • Perigee: 338 km
  • Apogee: 449 km
  • Inclination: 51.59 °
  • Erdumlaufzeit: 91.34 min