Gallery
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The Core stage of the PSLV is the S139 Booster
| 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 |
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.[1] 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.
The S139 Booster has been used in 2 major ISRO rockets.
It is used in the PSLV as its core stage since 1993.[2]
It is also used as a core stage in Geosynchronous Satellite Launch Vehicle MKII rocket.[3]
It is also the part of a variant of the Unified Launch Vehicle which is under development.[4]
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