PRSS 1

PRSS 1 is an active satellite operated by Pakistan Space and Upper Atmosphere Research Commission (SUPARCO) (Pakistan), launched on 2018-07-09 from Jiuquan, China. It orbits in Low Earth Orbit (LEO) at altitudes between 622 km and 624 km with an inclination of 97.8°. It travels at approximately 27,177 km/h (7.55 km/s), completing one full orbit every 97 minutes — that’s roughly 14.82 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 PRSS 1 in real time using the latest two-line element set (TLE) data, providing live position, altitude, speed and orbital path updated continuously.

PRSS 1 orbits at an average altitude of 623 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 PRSS 1’s average altitude, there are currently 833 active payloads and 791 tracked debris or rocket body fragments — notable neighbours include ONEWEB-0050, STARLINK-3055, STARLINK-3109. With an inclination of 97.8°, PRSS 1 passes over latitudes between 97.8°N and 97.8°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. Pakistan operates approximately 7 active satellites in total.