Mitsubishi Heavy Industries
Countdown to launch

This H3-30 mission by Mitsubishi Heavy Industries is scheduled to launch from Tanegashima Space Center, Japan. This test flight mission targets Sun-Synchronous Orbit. The H3 rocket family has been instrumental in modern space access, representing decades of engineering refinement in propulsion, guidance systems, and structural design.
Every rocket launch involves precise coordination between the launch vehicle, payload, ground systems, and range safety. The launch window is carefully calculated based on orbital mechanics — for missions targeting the International Space Station, the window may be only seconds long, while interplanetary missions can have windows lasting weeks. Weather conditions, including upper-level winds, lightning risk, and cloud ceiling, are monitored up until the final moments before ignition. Space weather conditions from solar activity can also affect launch decisions, as high radiation levels may pose risks to satellite electronics.
For more launch information, visit the full launch schedule, track the International Space Station where many missions are headed, or browse launch photography in the NASA gallery.
Test flight of the H3-30 variant of the H3 launch vehicle with 3 LE-9 engines in the first stage and no SRBs. The flight will carry a dummy main payload (Vehicle Evaluation Payload 5, VEP-5) and several hitchhiking small satellites: * PETREL * STARS-X * BRO-22 * VERTECS * HORN-L/R
Vehicle
Family
Variant
Window Opens
Window Closes
Webcast will be available closer to launch
Pad
Yoshinobu Launch Complex LP-2
Location
Tanegashima Space Center, Japan
Country
JPN
Coordinates
30.400938, 130.97564
Mitsubishi Heavy Industries
Commercial
Country
JPN
Current T-0 confirmed by official or reliable sources.