On August 10, 2026, a Japanese H-3 launch vehicle lifted off from the Tanegashima Space Center carrying Japan’s Quasi-Zenith Satellite 7 (QZS-7) spacecraft, which hosts an optical Space Domain Awareness (SDA) sensor payload for the United States Space Force.
The launch marks the successful completion of the two-flight Quasi-Zenith Satellite System-Hosted Payload (QZSS-HP) program, establishing the first bilateral national security space hardware effort executed between the United States and Japan.
Positioned in a quasi-zenith orbit above the Indo-Pacific region, the sovereign U.S. sensor will feed near-real-time tracking telemetry directly into the U.S. Space Surveillance Network to monitor satellite activity across geosynchronous orbits.
Program Heritage and Bilateral Defense Framework
The QZSS-HP initiative stems from a December 2020 international agreement signed between the U.S. Space Force and Japan’s National Space Policy Secretariat. Managed under the Space Force’s Portfolio Acquisition Executive for Space Combat Power, the two-mission effort was established to enhance space domain awareness, operational interoperability, and collective deterrence across the Pacific theater.
The second launch builds upon broader Japanese satellite navigation deployment plans, including Japan’s expansion of the Quasi-Zenith Satellite System constellation to deliver sovereign positioning, navigation, and timing (PNT) coverage alongside U.S. Global Positioning System (GPS) signals.
Sensor Architecture and System Specifications
The optical SDA hosted payload was engineered and built by the Massachusetts Institute of Technology’s Lincoln Laboratory (MIT/LL) in Lexington, Massachusetts. U.S. and Japanese technical teams worked alongside prime contractor Mitsubishi Electric Corporation for two years to integrate and test the sensor stack with the QZS-7 host spacecraft at facilities in Kamakura, Japan.
The host spacecraft weighs approximately 4.9 metric tons and relies on Mitsubishi Electric’s standard navigation bus architecture. Ground operations and command telemetry for the U.S. payload will be executed via the Multi-Mission Space Operations Center/Enterprise Command and Control Schriever enclave in Colorado.
“The successful launch of QZS-7 is a powerful testament to the enduring strength and rapid modernization of the U.S.-Japan alliance,” stated USSF Col. Bryon McClain, Space Force portfolio acquisition executive for Space Combat Power. “By continuing to merge our capabilities in space modernization and satellite communications, we are maintaining security in a contested space domain and fortifying our shared deterrence capabilities across the Indo-Pacific region.”
“QZSS-HP is a key contributor to help us meet the threat of peer adversaries in space and build towards resilient capabilities to detect, understand, and maintain custody of objects in deep space,” added USSF Col. Gina Peterson, deputy commander of Mission Delta 2 – Space Domain Awareness.
“The U.S.-Japan Alliance is one of our greatest strategic advantages in the Pacific,” noted USSF Brig. Gen. Brian Denaro, commander of U.S. Space Forces Pacific. “The QZSS-Hosted Payload program demonstrates how we enhance security across the Pacific. From design through launch, this milestone reflects years of collaboration that strengthen our resilience, enhance interoperability, and reinforce the alliance’s ability to deliver operational advantage across our combined and joint forces.”
Operational Command and Indo-Pacific Coverage
Following orbital insertion and initial on-orbit checkout procedures managed jointly by JAXA, Mitsubishi Electric, and USSF technical teams, primary operational authority over the U.S. sensor will transition to Combat Forces Command’s Mission Delta 2 (MD 2). Operating out of Schriever Space Force Base, Mission Delta 2 will integrate the payload’s deep-space optical tracking feeds into daily Space Domain Awareness operations to identify, characterize, and maintain custody of spacecraft maneuvering across high-altitude Indo-Pacific orbital regimes.
