TEN-KOH

TEN-KOH is an active satellite operated by Kyushu Institute of Technology (KIT) (Japan), launched on 2018-10-29 from TNSTA. It orbits in Low Earth Orbit (LEO) at altitudes between 550 km and 566 km with an inclination of 98.1°. It travels at approximately 27,305 km/h (7.58 km/s), completing one full orbit every 96 minutes — that’s roughly 15.03 orbits per day. Its near-polar, sun-synchronous orbit means it passes over any given point on Earth at approximately the same local solar time, ideal for consistent Earth observation lighting conditions. At its current altitude, the estimated orbital lifetime before atmospheric re-entry is ~3–10 years. Orbital Radar tracks TEN-KOH in real time using the latest two-line element set (TLE) data, providing live position, altitude, speed and orbital path updated continuously.

TEN-KOH orbits at an average altitude of 558 km in a sun-synchronous orbit (SSO), a specialised subset of LEO where the orbital plane precesses to maintain a constant angle relative to the Sun. This provides consistent lighting conditions on every pass — essential for Earth observation, weather monitoring and environmental science. Within ±50 km of TEN-KOH’s average altitude, there are currently 3,274 active payloads and 407 tracked debris or rocket body fragments — notable neighbours include STARLINK-1184, STARLINK-1276, ONEWEB-0050. This makes it one of the more crowded altitude bands, containing roughly 18.8% of all active satellites. With an inclination of 98.1°, TEN-KOH passes over latitudes between 98.1°N and 98.1°S, providing near-global coverage including the polar regions. Polar and near-polar orbits are used for reconnaissance, weather monitoring and Earth-observation missions that need to image every part of the planet. Japan operates approximately 189 active satellites in total, of which 40 share a similar altitude band with TEN-KOH.