Soyuz 7K-OK
Soyuz 7K-OK (active) spacecraft with an active docking unit
ManufacturerExperimental Design Bureau (OKB-1)
Country of originSoviet Union
OperatorSoviet space program
ApplicationsTested a new crewed space vehicle in orbit and returned to Earth
RegimeLow Earth orbit
StatusNo longer in service
Maiden launchKosmos 133, 1966
Last launchSoyuz 9, 1970
Related spacecraft
Derived fromSoyuz-A (concept only)
DerivativesSoyuz 7K-OKS (Salyut 1 ferry)

Soyuz 7K-L1[1] (lunar) Soyuz 7K-LOK[citation needed] (lunar)

Soyuz 7K-T (successor)
Soyuz family tree: Proposed Soyuz models in white, models that flew in blue and lunar models in green.[citation needed]

Soyuz 7K-OK was the first generation of Soyuz spacecraft and was flown between 1967 and 1971.[2] The 7K-OK was used for the first ferry flights to the Salyut space station program, beginning a long history of space station service that continues with the International Space Station (ISS).

As of 2024, the 7K-OK was responsible for the only fatalities of the Soyuz programme, with Soyuz 1 in 1967 (sole crew-member killed by parachute failure) and Soyuz 11 in 1971 (three crew killed by depressurisation during reentry).

The first uncrewed automated docking in the history of spaceflight was achieved between 7K-OK spacecraft Kosmos 186 and Kosmos 188 in 1967. Additional firsts include the first docking between two crewed spacecraft (Soyuz 4 and Soyuz 5), the longest crewed flight involving only one spacecraft (the 18-day flight of Soyuz 9 in 1970), and the first successful transfer of crew to the first space station in the history of space flight (Soyuz 11 and Salyut 1 in 1971).


The Soyuz 7K-OK vehicles carried a crew of up to three without space suits. The craft can be distinguished from those following by their bent solar panels and their use of the Igla automatic docking navigation system, which required special radar antennas.

The 7K-OK was primarily intended as a variant of the 7K-LOK (the lunar mission Soyuz) for Earth orbital testing. Mostly the same vehicle, it lacked the larger antenna needed to communicate at lunar distance. The early Soyuz models also sported an external toroidal fuel tank surrounding the engines and meant to store extra propellant for lunar flights, but it was left empty on the first nine flights. After the spacecraft's purpose was changed to space station ferry duties, the tank was removed.

Soyuz 7K-OK spacecraft had a "probe and drogue" docking mechanism to connect with other spacecraft in orbit, in order to gather engineering data as a preparation for the Soviet space station program. There were two variants of Soyuz 7K-OK: Soyuz 7K-OK (active) featuring an active "probe" docking port, and Soyuz 7K-OK (passive) featuring a passive "drogue" docking target. The docking mechanisms of 7K-OK and 7K-LOK did not allow internal transfer (this feature was added on the Soyuz 7K-OKS version), thus cosmonauts had to spacewalk between docked modules. This procedure was conducted successfully on the joint Soyuz 4 and Soyuz 5 missions, where Aleksei Yeliseyev and Yevgeny Khrunov transferred from their Soyuz 5 to the Soyuz 4 craft.

The first uncrewed test of this version was Kosmos 133, launched on 28 November 1966.

Soyuz 7K-OKS

Main article: Soyuz 7K-OKS

The last two Soyuz space craft of this series were of the designation Soyuz 7K-OKS. The main modification was the addition of the new SSVP docking system that allowed internal crew transfer, which was performed for the first time on the Salyut 1 space station by Soyuz 11. The SSVP docking adapter is still in use today on the International Space Station (ISS).

Uncrewed and test missions

Crewed missions


  1. ^ Siddiqi, Asif (March 2003). Simpson, Clive; Owens, Lucy (eds.). "Soyuz variants: a 40-year history" (PDF). British Interplanetary Society. 45 (3): 119.
  2. ^ Portree, David (March 1995). "Mir Hardware Heritage" (PDF). NASA. Archived from the original (PDF) on 7 September 2009. Retrieved 24 August 2012. Public Domain This article incorporates text from this source, which is in the public domain.