H-2A R/B

H-2A R/B is a spent rocket body associated with Japan, launched on 2014-10-07 from TNSTA on the Himawari 8 launch. After 12 years in orbit, it continues to be tracked by global surveillance networks. It orbits in Medium Earth Orbit (MEO) at altitudes between 227 km and 25,539 km with an inclination of 22.5°. It travels at approximately 16,380 km/h (4.55 km/s), completing one full orbit every 7 hours 23 minutes — that’s roughly 3.25 orbits per day. Its orbital eccentricity of 0.6573 gives it a noticeably elliptical path, with significant altitude variation between perigee and apogee. Spent rocket bodies like H-2A R/B are among the largest pieces of uncontrolled space debris and are priority targets for collision avoidance manoeuvres and future active debris removal efforts.

H-2A R/B orbits at an average altitude of 12,883 km in Medium Earth Orbit, the region between LEO and GEO (2,000–35,786 km). MEO’s higher altitude gives each satellite a much larger ground footprint than LEO, meaning fewer spacecraft are needed for global coverage — but signal latency is higher and radiation from the Van Allen belts is a significant design constraint. With an inclination of 22.5°, H-2A R/B passes over latitudes between 22.5°N and 22.5°S, covering the tropical and temperate zones where most of the world’s population resides. Low-to-mid inclination orbits are efficient to reach from equatorial and mid-latitude launch sites. Japan operates approximately 190 active satellites in total.