Soyuz MS-09

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Soyuz MS-09
The Soyuz MS-09 spacecraft is pictured docked to the Rassvet module.jpg
Operator Roskosmos
Spacecraft properties
Spacecraft type Soyuz-MS 11F747
Manufacturer RKK Energia
Crew size 3
Members Sergey Prokopyev
Alexander Gerst
Serena M. Auñón-Chancellor
Callsign Altai
Start of mission
Launch date 6 June 2018 11:12:41 UTC[1]
Rocket Soyuz-FG
Launch site Baikonur Pad 1/5
End of mission
Landing date December 20, 2018 (planned)[2]
Orbital parameters
Reference system Geocentric
Regime Low Earth
Docking with ISS
Docking port Rassvet nadir
Docking date 8 June 2018 13:01 UTC
Soyuz-MS-09-Mission-Patch.png Soyuz MS-09 crew during Routine Ops training at JSC.jpg
(l-r) Prokopyev, Gerst and Auñón-Chancellor
Soyuz programme
(Manned missions)

Soyuz MS-09 is a Soyuz spaceflight which launched on June 6, 2018.[1] It transported three members of the Expedition 56 crew to the International Space Station. MS-09 is the 138th flight of a Soyuz spacecraft. The crew consists of a Russian commander, and an American and a German flight engineer.

During the night of August 29, 2018[3], a small air leak was noticed by ground control. The initial hypothesis was that a micro-meteoroid impact resulted in a 2mm hole in the Orbital Module of MS-09. Russian crew members used Kapton tape to temporarily seal the leak while a permanent fix was devised. The leak was successfully sealed with the use of a repair kit based on an epoxy sealant, and no further changes in air pressure were noted as of August 31[4][5]. On September 4, 2018, it was announced that the hole was created by a drill, but it was unclear if it was accidental or deliberate.[6]

Following the launch failure of Soyuz MS-10, the return of the MS-09 crew was delayed until the arrival of the next crew on MS-11. As of 21 October 2018, the MS-09 return flight was scheduled for December 20, 2018.[2]


Position Crew member
Commander Russia Sergey Prokopyev, RSA
Expedition 56
First spaceflight
Flight Engineer 1 Germany Alexander Gerst, ESA
Expedition 56
Second spaceflight
Flight Engineer 2 United States Serena M. Auñón-Chancellor, NASA
Expedition 56
First spaceflight

Backup crew

Position[7] Crew member
Commander Russia Oleg Kononenko, RSA
Flight Engineer 1 Canada David Saint-Jacques, CSA
Flight Engineer 2 United States Anne C. McClain, NASA


  1. ^ a b
  2. ^ a b "Назначены даты отправки и возвращения с МКС космонавтов после аварии на Байконуре" [Dates assigned for next flights of cosmonauts to and from the ISS after the Baikonur incident] (in Russian). Interfax. October 21, 2018. Retrieved October 22, 2018.
  3. ^ Chris Gebhardt (2018). "Soyuz/Station atmosphere leak no threat to Crew as repairs continue".
  4. ^ Clark, Stephen (30 August 2018). "Cosmonauts plug small air leak on the International Space Station". Spaceflight Now. Retrieved 2 September 2018.
  5. ^ Roscosmos (2018). "Роскосмос. Информационное сообщение".
  6. ^ Harwood, William (4 September 2018). "Russians investigate cause of Soyuz leak, focus on human error". Spaceflight Now. Retrieved 5 September 2018.
  7. ^ (2013). "Орбитальные полёты".
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