# Soyuz 2.1b | Bion-M No. 2: launch

> Soyuz 2.1b by Russian Federal Space Agency (ROSCOSMOS) from Baikonur Cosmodrome, Republic of Kazakhstan. Flown: Success.

- Canonical page: https://spacenexus.us/launch/cmtdf16vh00tjoqhxlti93u70
- This Markdown version: https://spacenexus.us/launch/cmtdf16vh00tjoqhxlti93u70.md
- Data as of: 2026-10-20 13:15 UTC (last Launch Library 2 sync)
- How the numbers are made: https://spacenexus.us/launch-slips/method

## Facts

- Launch: Soyuz 2.1b | Bion-M No. 2
- Mission: Bion-M No. 2
- Provider: Russian Federal Space Agency (ROSCOSMOS)
- Rocket: Soyuz 2.1b
- Pad: Baikonur Cosmodrome, Republic of Kazakhstan
- Country of the launch site: KAZ
- Date (UTC): Wed, Aug 20, 17:13 UTC (2025-08-20T17:13:10.000Z)
- Status: completed (Launch Library 2: Success)
- Outcome: Success
- Real slips recorded: 0; other date moves (placeholder rolls, firmings), not slips: 0

## Mission description

Quoted from Launch Library 2: Bion-M is the next generation of Russian biological research satellites. While retaining the Vostok/Zenit-derived reentry module of the earlier Bion, the propulsion module has been replace by a Yantar type module, which provides maneuvering capabilities and longer mission support. The mission duration has been increased to up to 6 months by using solar cells for energy generation. The weight of scientific equipment has been increased by 100 kilograms.

## Date history

No date change recorded for this launch since our ledger began.

## Sources

- [Launch Library 2 by The Space Devs](https://thespacedevs.com): launch names, providers, rockets, pads, dates and status
- [SpaceNexus Launch Ledger (our own record of every date change)](https://spacenexus.us/launch-slips/method)
- [Mission information (link from Launch Library 2)](https://www.spacelaunchnow.me/launch/soyuz-21b-bion-m-no-2)

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