Sergei Mikayev
Russian cosmonaut
Sergei Nikolayevich Mikayev (Russian: Сергей Николаевич Мика́ев; born 15 August 1986) is a Russian cosmonaut affiliated with Roscosmos. He was selected as a reserve crew member for the Soyuz MS-27 mission to the International Space Station (ISS), which launched in April 2025.
Career
Mikayev was selected as a cosmonaut candidate by Roscosmos and trained at the Yuri Gagarin Cosmonaut Training Center in Star City, Russia. In 2025, he was assigned to the reserve crew for Soyuz MS-27 as a backup flight engineer, supporting the primary crew of Sergey Ryzhikov, Alexey Zubritsky, and Jonny Kim. This mission, set to launch from the Baikonur Cosmodrome in Kazakhstan in April 2025, aims to facilitate long-term operations aboard the ISS. His role ensures readiness to step in if a primary crew member is unable to fly.
Expedition 73/74
Mikayev conducted his first spaceflight and first ISS expedition aboard Soyuz MS-28. The mission launched on 27 November 2025 from Baikonur, Site 31/6. He continued into Expedition 73/74 and returned to Earth by summer of 2026.
Begin with the source’s own compact description: “Sergei Mikayev” is russian cosmonaut. The dossier treats that line as a proposition to test through Sergei, Mikayev and Russian, not as a finished interpretation.
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Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated Sep 1, 2026. The linked authority identifier is Q109490152. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1986, 2025 and 2026.
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This entry incorporates text from “Sergei Mikayev” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.