H3 Launch Vehicle
Japan’s H3 is a modular launch vehicle jointly developed by JAXA and Mitsubishi Heavy Industries, using two LE-9 first-stage engines, one LE-5B-3 second-stage engine, and selectable SRB-3 solid boosters.
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Future launches and major activity directly linked to this vehicle family.
Identity
- Aliases
- H3H3 rocket
- Family Name
- H3 Launch Vehicle
- Full Name
- H3 Launch Vehicle
- Status
- active
- Type
- rocket
Details
- Description
- Japan’s H3 is a modular launch vehicle jointly developed by JAXA and Mitsubishi Heavy Industries, using two LE-9 first-stage engines, one LE-5B-3 second-stage engine, and selectable SRB-3 solid boosters.
- First Flight Year
- 2,023
- Propulsion Configurations
- Entries
- Count
- 2
- Placement
- core
- Propulsion System
- Role
- main
- Stage
- first-stage
- Variant Notes
- MHI/JAXA specify two LE-9 first-stage engines.
- Count
- 1
- Placement
- upper
- Propulsion System
- Role
- upper-stage
- Stage
- second-stage
- Variant Notes
- MHI/JAXA specify one LE-5B-3 second-stage engine.
- Name
- H3-30S
- Notes
- MHI identifies H3-30S as the no-SRB-3 configuration with two LE-9 first-stage engines and one LE-5B-3 second-stage engine.
- Entries
- Count
- 2
- Placement
- core
- Propulsion System
- Role
- main
- Stage
- first-stage
- Count
- 2
- Placement
- booster
- Propulsion System
- Role
- booster
- Stage
- first-stage
- Variant Notes
- MHI/JAXA specify two SRB-3 solid boosters.
- Count
- 1
- Placement
- upper
- Propulsion System
- Role
- upper-stage
- Stage
- second-stage
- Name
- H3-22
- Notes
- MHI identifies H3-22 as the two-SRB-3 configuration with two LE-9 first-stage engines and one LE-5B-3 second-stage engine.
- Entries
- Count
- 2
- Placement
- core
- Propulsion System
- Role
- main
- Stage
- first-stage
- Count
- 4
- Placement
- booster
- Propulsion System
- Role
- booster
- Stage
- first-stage
- Variant Notes
- MHI/JAXA specify four SRB-3 solid boosters.
- Count
- 1
- Placement
- upper
- Propulsion System
- Role
- upper-stage
- Stage
- second-stage
- Name
- H3-24
- Notes
- MHI identifies H3-24 as the four-SRB-3 configuration with two LE-9 first-stage engines and one LE-5B-3 second-stage engine.
- Rocket Specs
- Stages Count
- 2
Links
- Official Url
- https://global.jaxa.jp/projects/rockets/h3/
Assets & Meta
- Creation Time
- August 13, 2026 at 22:51:40 UTC
- Updated Time
- August 20, 2026 at 05:01:08 UTC