S139 Booster
The S139 (S for Solid, 139 for weight of 139 tonnes) is a Solid Rocket Booster manufactured by the Indian Space Research Organization at the Satish Dhawan Space Center in the SPROB facility. The rocket motor was first developed for use in the Polar Satellite Launch Vehicle. Later it was utilized in the GSLV MKII. It uses hydroxyl-terminated polybutadiene (HTPB) as a propellant. It has a maximum thrust of 4800 kN.
| Manufacturer | Satish Dhawan Space Center |
|---|---|
| Country of origin | India |
| Used on | GSLV and PSLV |
| General characteristics | |
| Diameter | 2.8m |
| Propellant mass | 138 tonnes |
| Launch history | |
| Status | Active |
| First flight | Sep 20, 1993 |
| Last flight | Jul 30, 2023 |
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