# Soyuz 2.1b/Fregat | Glonass-K1 No. 20 (?): launch

> Soyuz 2.1b Fregat-M by Russian Space Forces from Plesetsk Cosmodrome, Russian Federation. Flown: Success.

- Canonical page: https://spacenexus.us/launch/cmsmhcjjvfxy33x6awns27csk
- This Markdown version: https://spacenexus.us/launch/cmsmhcjjvfxy33x6awns27csk.md
- Data as of: 2026-10-13 03:00 UTC (last Launch Library 2 sync)
- How the numbers are made: https://spacenexus.us/launch-slips/method

## Facts

- Launch: Soyuz 2.1b/Fregat | Glonass-K1 No. 20 (?)
- Mission: Glonass-K1 No. 20 (?)
- Provider: Russian Space Forces
- Rocket: Soyuz 2.1b Fregat-M
- Pad: Plesetsk Cosmodrome, Russian Federation
- Country of the launch site: RUS
- Date (UTC): Thu, Sep 17, 16:50 UTC (2026-09-17T16:50:00.000Z)
- Status: completed (Launch Library 2: Success)
- Outcome: Success
- Real slips recorded: 0; other date moves (placeholder rolls, firmings), not slips: 2

## Mission description

Quoted from Launch Library 2: Note: Satellite serial number and Cosmos designation not confirmed. Glonass-K are the third generation of satellite design for GLONASS satellite navigation system. GLONASS is a Russian space-based navigation system comparable to the similar GPS and Galileo systems. This generation improves on accuracy, power consumption and design life. Each satellite is unpressurized and weighs 935 kg, and has an operational lifetime of 10 years.

## Date history

"Seen live" means our sync saw the change when it happened; "caught up late" means Launch Library 2 made it earlier, on a day we do not know, and it is never counted as a slip.

| Observed | From | To | Kind | Shift (days) | Observation |
| --- | --- | --- | --- | --- | --- |
| 2026-09-17 | Dec 31, 2026 (placeholder) | Sep 30, 2026 (placeholder) | Placeholder roll | -92 | seen live |
| 2026-09-18 | Sep 30, 2026 (placeholder) | Sep 17, 2026 | Firmed | -12.3 | seen live |

## 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-21bfregat-glonass-k1-no-20)

## Licence and credits

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- Launch facts (names, providers, rockets, pads, dates, status): Launch Library 2 by The Space Devs (thespacedevs.com), credited and not relicensed by SpaceNexus.
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