Japan Aerospace Exploration Agency (JAXA) has confirmed the launch timing for its Innovative Satellite Technology Demonstration-4 (ISTD-4) mission, issuing a schedule update on October 10, 2025 (JST). The notice, published in Japanese, signals that preparations are advancing toward liftoff for the next phase of JAXA’s in-orbit technology validation program.
What the update indicates
JAXA’s schedule notice confirms the planned launch period and aligns the campaign for late-stage prelaunch operations. Final confirmation of the specific date and time is expected closer to liftoff following standard vehicle, range, and weather checks.
- Update posted: October 10, 2025 (JST)
- Program: Innovative Satellite Technology Demonstration
- Notice language: Japanese
About the mission
ISTD-4 continues JAXA’s effort to validate new small-satellite hardware, sensors, software, and operational concepts in space. By aggregating multiple experiments from industry, academia, and research institutes, the program aims to shorten development cycles and reduce risk ahead of future operational deployments.
Why the timing matters
Confirming the launch window enables payload teams and ground partners to lock timelines for integration, logistics, and network support. It also frames downstream coordination across range operations, tracking, and data dissemination for the broader community.
Next steps
- Completion of spacecraft and payload functional checks and environmental verifications.
- Range readiness activities and rehearsal milestones.
- Final publication of target date/time and broadcast details ahead of launch.
Additional information such as a detailed payload manifest, trajectory constraints, and live coverage plans is typically released as the campaign approaches liftoff.
Source: JAXA press update
