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ELITERetiredROS
ELITERetiredROSRoscosmos·🇷🇺 Russia·Born 1956
Sergei Avdeyev
Accumulated 747 days across three long Mir expeditions, holding the world record for cumulative time in space from 1999 until 2005.
2.0y
Years in Space
3
Missions
10
EVAs
42h
EVA Time
Biography
Accumulated 747 days across three long Mir expeditions, holding the world record for cumulative time in space from 1999 until 2005.
Before NASAEngineer-physicist at NPO Energiya from 1979 after graduating from the Moscow Engineering Physics Institute, where he worked on spacecraft systems until his cosmonaut selection in 1987.
Mission Timeline
- Flight Engineer
Soyuz TM-15
Mir EO-12
Launch: Jul 27, 1992Landing: Feb 1, 1993Duration: 189 days- First of his three long-duration Mir expeditions
- Flight Engineer
Soyuz TM-22
Mir EO-20
Launch: Sep 3, 1995Landing: Feb 29, 1996Duration: 179 days- Hosted ESA's Euromir 95 research program
- Flight Engineer
Soyuz TM-28 (return on Soyuz TM-29)
Mir EO-26/27
Launch: Aug 13, 1998Landing: Aug 28, 1999Duration: 380 days- 379.6-day flight made him the cumulative time-in-space record holder of his era
Beyond the Mission
Hobbies & Interests
amateur radio
Languages
Russian
Fun fact
Avdeyev's 747 cumulative days in orbit — spread across three Mir missions — meant he aged approximately 20 milliseconds slower than people on Earth due to relativistic time dilation, making him one of the greatest time travelers in human history.
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