Japan Launches Military Satellite on Fifth Attempt

The Japan Aerospace Exploration Agency (JAXA) launched its H3 rocket No. 4 carrying the Kirameki 3 X-band communication satellite for the Defense Ministry on Monday, marking the completion of Japan's planned three-satellite configuration for defense communication.

The launch, which took place at the Tanegashima Space Center in Kagoshima Prefecture, overcame delays from four previous attempts due to weather and technical issues. Despite cloudy skies and some wind, conditions allowed the launch to proceed as scheduled this time.

The Kirameki 3 satellite, part of Japan’s defense communications strategy, is designed to enhance the Self-Defense Forces' ability to transmit critical command-and-operational data. The X-band communication technology onboard Kirameki 3 allows for high-speed, large-capacity data transmission that is less vulnerable to weather-related interference, enabling reliable command support and secure data sharing. With the addition of this satellite, Japan's defense ministry can quickly relay ballistic missile warnings, transmit video from deployed units, and exchange operational data with tactical units.

In a post-launch statement, Makoto Arita, JAXA’s H3 project manager, said the successful deployment of the satellite signifies a stable operational phase for the H3 rocket, which aims to replace the aging H-IIA rocket model. Arita expressed relief at the launch’s success, emphasizing the importance of the mission for national defense.

The H3 rocket followed a designated trajectory, separating into two stages before deploying the satellite into orbit. The rocket's remnants then fell into the ocean as planned.

Mitsubishi Heavy Industries collaborated with JAXA in the H3 rocket's development. Iwao Igarashi, head of the Space Systems Division, confirmed that the satellite will now move into its final geostationary orbit and is expected to support the Defense Ministry’s operational missions.

Japan's Defense Minister Gen Nakatani noted that the Kirameki 3 completes the planned X-band communications satellite network, joining Kirameki 1 and Kirameki 2. With these three satellites in operation, the Self-Defense Forces (SDF) can now rely on a more resilient and comprehensive satellite network, which will enhance the SDF’s operational communication capabilities. The ministry also plans to extend ground capabilities by expanding compatible equipment and upgrading bandwidth at ground stations.

According to a recent white paper by the Defense Ministry, the agency will continue developing next-generation defense satellites equipped with interference-resistant technologies. These advancements are part of an ongoing effort to replace older satellites and ensure stable and secure communication lines for defense missions.

The H3 rocket, Japan’s latest model, represents JAXA’s flagship launch vehicle following the scheduled retirement of the H-IIA rocket. Although the H3 program faced setbacks, including a failed initial launch last year, this deployment is expected to strengthen the H3’s reliability for both defense missions and future commercial satellite launches.