The recent failure of Japan's H3 rocket has been attributed to an anomaly involving its payload, the Michibiki 5 navigation satellite, which was launched by the Japan Aerospace Exploration Agency (JAXA) on December 21, 2025. Shortly after liftoff, the rocket's second-stage engine experienced a fault, leading to its premature shutdown.
Approximately four minutes into the flight, the rocket's payload fairing, designed to protect the satellite, came apart. This separation left the satellite exposed and struggling to maintain its position, ultimately resulting in its descent back to Earth. JAXA's investigation revealed that pressure in the second-stage hydrogen tank began to drop during the first-stage burn, which delayed the first-stage engine cutoff by 27 seconds.
Footage from a camera on the payload adapter indicated that the satellite sustained damage during the fairing's separation, surrounded by debris as it lost its protective shell. This incident adds to the challenges faced by the H3 rocket system, which previously experienced a self-destruct command shortly after its initial launch on March 6, 2023, but has since successfully completed five missions.