HTV-X1 Splashed Down 23:09 and 00:09 JST

The HTV-X1 spacecraft splashed down in the Pacific Ocean between 23:09 and 00:09 JST, completing a mission that extended beyond simple cargo delivery to the International Space Station. Following a de-orbit maneuver initiated at 22:44 JST on May 26, the HTV-X1 concluded two and a half months of on-orbit technology demonstrations after departing the ISS on March 7. This successful re-entry marks the tenth overall mission, building on nine successful KOUNOTORI missions.

HTV-X1 Cargo Delivery and ISS Servicing

Launched from the Tanegashima Space Center on October 26, the spacecraft successfully docked with the International Space Station (ISS) and offloaded its supplies before being reloaded with waste materials for disposal; this cycle highlights the HTV-X1’s role in maintaining the ISS’s operational capacity. This mission builds upon a robust history of success, as the HTV-X1 is the first vehicle in the HTV-X series, inheriting the development and operational expertise accumulated through nine successful KOUNOTORI missions. JAXA President Yamakawa Hiroshi stated that he wanted to express sincere gratitude to all domestic and international partners and to the people of Japan for their tremendous backing and cooperation in the development, launch, and operation of HTV-X. The HTV-X1 is the only spacecraft capable of delivering large-scale experimental equipment to the ISS, fulfilling Japan’s commitments to both domestic and international partners by transporting essential supplies.

Beyond its current role, JAXA envisions the HTV-X series supporting future endeavors, including lunar and Martian exploration, and cargo delivery to potential post-ISS space stations, demonstrating a long-term commitment to advancing space utilization and exploration capabilities. The agency intends to continue to advance development and operation of this versatile spacecraft, recognizing its potential to facilitate increasingly ambitious missions in the years to come.

This extended operational phase allowed for unique testing opportunities unavailable with simpler cargo missions, broadening the scope of scientific return from the vehicle. The HTV-X1 represents a significant evolution in Japan’s unmanned cargo transfer capabilities, building upon the development and operational expertise accumulated through nine successful KOUNOTORI missions. As the first vehicle in the HTV-X series, it incorporates increased cargo capacity and enhanced operational flexibility, alongside the novel ability to conduct demonstrations after separating from the ISS.