Soyuz STB Fregat – Progress Rocket Space Center
- Family: Soyuz
- Length: 46.3 m
- Diameter: 2.95 m
- Launch Mass: 312 T
- Low Earth Orbit Capacity: 8200 kg
The Soyuz STB Fregat, manufactured by Progress Rocket Space Center established in 1996, undertook its inaugural launch on 10/21/2011. Notably, Soyuz STB Fregat has 13 successful launches and 1 failed attempts, with a cumulative tally of 14 launches, currently with 0 pending launches in the pipeline.
The 2.1b version adds an upgraded engine (RD-0124) with improved performance to the second stage. First launch took place from Plesetsk Cosmodrome Site 43 on 26 July 2008 with a classified military payload.
The 2.1b/ST version is sometimes called Soyuz ST-B.
