S139
S139 is ISRO’s composite solid rocket motor used as the PSLV first-stage core motor; the PSLV-XL configuration adds six extended solid strap-on motors around the core.
Identity
- Aliases
- S-139PS1 S139
- Domains
- spaceflight
- Identity Level
- model
- Kind
- solid-rocket-motor
- Name
- S139
- Status
- active
Details
- Description
- S139 is ISRO’s composite solid rocket motor used as the PSLV first-stage core motor; the PSLV-XL configuration adds six extended solid strap-on motors around the core.
- Propellants
- HTPB
Links
- Official Url
- https://www.isro.gov.in/ISRO_EN/PSLV_CON.html
Assets & Meta
- Creation Time
- August 13, 2026 at 22:29:29 UTC
- Updated Time
- August 13, 2026 at 22:29:29 UTC
Other
- Sources
- Note
- ISRO identifies PS1 as the first stage and names the S139 solid rocket booster containing 139 tonnes of HTPB; it also distinguishes PSLV-XL, QL, DL, and CA strap-on counts.
- Publisher
- Indian Space Research Organisation
- Title
- Polar Satellite Launch Vehicle (PSLV)
- Note
- ISRO identifies the four-stage PSLV architecture and six PSOM-XL strap-on motors for the XL configuration.
- Publisher
- Indian Space Research Organisation
- Title
- PSLV-C11 / Chandrayaan-1