ZY-1 02D

ZY-1 02D is an active satellite operated by China Centre for Resources Satellite Data and Application (CRESDA) (China), launched on 2019-09-12 from Taiyuan, China. It orbits in Low Earth Orbit (LEO) at altitudes between 771 km and 775 km with an inclination of 98.5°. It travels at approximately 26,891 km/h (7.47 km/s), completing one full orbit every 100 minutes — that’s roughly 14.36 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 ~25–100 years. Orbital Radar tracks ZY-1 02D in real time using the latest two-line element set (TLE) data, providing live position, altitude, speed and orbital path updated continuously.

ZY-1 02D orbits at an average altitude of 773 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 ZY-1 02D’s average altitude, there are currently 386 active payloads and 2,116 tracked debris or rocket body fragments — notable neighbours include ONEWEB-0179, ONEWEB-0455. With an inclination of 98.5°, ZY-1 02D passes over latitudes between 98.5°N and 98.5°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. China operates approximately 1,219 active satellites in total, of which 58 share a similar altitude band with ZY-1 02D.