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“Bisei Spaceguard Center”
Preventing Collisions Between Debris and Spacecraft


JAXA has published the following Q&A interview with  Mayumi Matsuura, the space agency’s space situation awareness (SSA) system project manager.

— What is the current state of space debris monitoring in Japan?

Kamisaibara Spaceguard Center (Credit: JAXA)

Space debris is monitored at the Kamisaibara Spaceguard Center and the Bisei Spaceguard Center, both in Okayama Prefecture. At Kamisaibara, we use radar to monitor debris in low Earth orbit (LEO) up to an altitude of approximately 2,000 km. Although the size of debris that can be monitored depends on its altitude, we can simultaneously track a total of 10 targets 1 meter or more in diameter. At Bisei, we use an optical telescope, which allows us to monitor debris in geostationary Earth orbit (GEO) at an altitude of 36,000 km.

JAXA analyzes data from these facilities to pinpoint debris orbit and position, and when this data and other inputs show that there is a possibility of debris colliding with satellites, a warning is issued to the satellite team. This is the role of the Space Tracking and Communications Center (STCC), where I work. To avoid being hit by debris, all you need to do is change your orbit, so the center prepares detailed proposals on when and how to do this. In some cases, debris is expected not to burn up on reentry into the atmosphere, but to fall back to Earth. In these situations, my job is to predict where it will reenter the atmosphere.
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