KKS-1 (KISEKI)

KKS-1 (KISEKI) is an active satellite operated by Tokyo Metropolitan College of Industrial Technology (Japan), launched on 2009-01-23 from TNSTA. After 17 years in orbit, it continues to be tracked by global surveillance networks. It orbits in Low Earth Orbit (LEO) at altitudes between 615 km and 624 km with an inclination of 98.1°. It travels at approximately 27,184 km/h (7.55 km/s), completing one full orbit every 97 minutes — that’s roughly 14.83 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. Its near-circular orbit (eccentricity close to zero) means it maintains a very consistent altitude throughout each revolution. At its current altitude, the estimated orbital lifetime before atmospheric re-entry is ~10–25 years. Orbital Radar tracks KKS-1 (KISEKI) in real time using the latest two-line element set (TLE) data, providing live position, altitude, speed and orbital path updated continuously.

KKS-1 (KISEKI) orbits at an average altitude of 620 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 KKS-1 (KISEKI)’s average altitude, there are currently 1,540 active payloads and 771 tracked debris or rocket body fragments — notable neighbours include ONEWEB-0050, STARLINK-3090, STARLINK-3077. This makes it one of the more crowded altitude bands, containing roughly 8.8% of all active satellites. With an inclination of 98.1°, KKS-1 (KISEKI) 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 33 share a similar altitude band with KKS-1 (KISEKI).