Pick up to 4 launch vehicles to compare side-by-side. State lives in the URL — share the link and the comparison loads exactly as you left it.
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| Attribute | |||
|---|---|---|---|
| Company | Space One | Shanghai Academy of Spaceflight Technology (SAST) / CASC | JAXA / IHI Aerospace |
| Country | 🇯🇵 Japan | 🇨🇳 China | 🇯🇵 Japan |
| Status | In Development | Active | Retired |
| Vehicle class | Small | Medium | Small |
| Propellant | Solid | RP-1 / LOX | Solid (HTPB — all stages) |
| Reusable | No | No | No |
| Stages | 4 | 2 | 3 |
| First flight | 2024 | 2024 | 2013 – 2022 |
| Payload to LEO | — | 12,000 kgas of [1]At 200 km altitude; 10,000 kg at 300 km. ↑ Best | 590 kgas of [1]500 kg to SSO. Enhanced Epsilon (from E-4) added 700 kg LEO via PBS liquid kick stage. |
| Payload to GTO | — | — | — |
| Height | — | 62 mas of [1] ↑ Best | 26 mas of [1] |
| Liftoff mass | — | 433 tas of [1] ↑ Best | 96 tas of [1] |
| Success rate | 0/3 — three consecutive failuresas of [1]2024-03-13: disintegrated shortly after liftoff. 2024-12-18: began tumbling during 1st-stage burn, flight terminated. 2026-03-04: flight termination activated ~70 seconds after liftoff. All three launches flew from Spaceport Kii, Wakayama — Japan's first private-sector spaceport. Program grounded as of this research; precise payload/height/mass specs not confirmed from a primary source. | 100% (6/6)as of [1] ↑ Best | 83.3%as of [2]5/6 successes. E-6 (Oct 12, 2022) PBS upper stage failed to ignite, eight satellites lost. Epsilon S (next-generation) ground test anomaly Jan 2023 effectively ended the programme. |
| Total flights | 3as of [1] | 6as of [1]All six flights deployed Guowang (China SatNet) internet-constellation satellites, exclusively from Wenchang Commercial Space Launch Site. ↑ Best | 6as of [2] ↑ Best |
| Cost / kg LEO | — | — | — |
| Summary | A Japanese commercial solid-fuel small launcher that has failed on all three flight attempts through March 2026, putting its commercial viability in serious question. | A medium-lift, kerosene/LOX launcher built specifically to deploy China's Guowang mega-constellation at high cadence from Wenchang's new commercial pads. | JAXA's small solid-fuel rocket derived from the M-V rocket heritage. Designed for highly autonomous operations — launch preparations could be managed by just 8 people. The sixth and final E-6 mission (Oct 2022) failed when the PBS kick stage didn't ignite; a ground explosion during Epsilon S testing (Jan 2023) ended the programme. |
48 launch vehicles across 10 countries — active, retired, and in development — with primary-source citations from manufacturer user guides and agency press kits. Pure URL state: bookmark or share the link and the comparison reproduces exactly.