Japan's H3 Rocket Successfully Launches After Previous Setbacks, Debuts Low-Cost Variant

Jun 12, 2026

Japan's H3 rocket successfully returned to flight on June 12, 2026, after failures in 2023 and 2025. The launch from Tanegashima Space Center debuted a new low-cost '30 configuration' designed to compete with SpaceX by using three liquid-fuel engines and no boosters. The success, which deployed six small satellites, is critical for Mitsubishi Heavy Industries and secures future missions, including the 2028 Martian Moons eXploration.

H3 rocket successful launch

▪The 63-meter-tall rocket deployed six small satellites, including one from France, which was Japan's first commercial satellite from a foreign country.
▪Japan's H3 rocket successfully launched from the Tanegashima Space Center on June 12, 2026, reaching its targeted orbit.
▪The payload included the Institute of Science Tokyo's Umitsubame satellite for ocean observation and Shizuoka University's Shiraito for testing space debris removal.

Low-cost '30 configuration debut

▪The '30 configuration' is a streamlined model powered by three liquid-fuel LE-9 engines and operates without solid rocket boosters to reduce costs.
▪The launch marked the debut of the H3's new "30 configuration," a low-cost variant designed to compete with providers like SpaceX.

Recovery from previous failures

▪The H3 rocket is designed to replace Japan's aging but highly reliable H-2A rocket, which had a near-perfect success record.
▪The successful flight follows previous mission failures, including one in March 2023 and another in December 2025 that grounded the program.

Japan 2028 Mars mission

▪This success is critical for Japan's future space ambitions, including the Martian Moons eXploration (MMX) mission planned for 2028.
▪A third consecutive failure would have severely jeopardized Japan's deep-space exploration goals and caused significant delays.

Mitsubishi Heavy Industries positioning

▪Future H3 missions include deploying the Michibiki No. 7 navigation satellite and the HTV-X cargo spacecraft.
▪The H3 rocket was co-developed by the Japan Aerospace Exploration Agency (JAXA) and Mitsubishi Heavy Industries (MHI).
▪The success validates Mitsubishi Heavy Industries' engineering and strategic pivot toward cost-effective solutions, rebuilding trust with partners and clients.
▪JAXA and Mitsubishi Heavy Industries aim to increase the H3 launch frequency to six to eight missions annually.