UPM/LBSAT

UPM/LBSAT is an active satellite operated by IDR/UPM (Spain), launched on 1995-07-07 from Guiana Space Centre, French Guiana on the Helios 1A launch. With over 31 years in orbit, it has far exceeded many satellites’ design lifetimes. It orbits in Low Earth Orbit (LEO) at altitudes between 609 km and 618 km with an inclination of 98.3°. It travels at approximately 27,196 km/h (7.55 km/s), completing one full orbit every 97 minutes — that’s roughly 14.85 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 UPM/LBSAT in real time using the latest two-line element set (TLE) data, providing live position, altitude, speed and orbital path updated continuously.

UPM/LBSAT orbits at an average altitude of 614 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 UPM/LBSAT’s average altitude, there are currently 1,288 active payloads and 786 tracked debris or rocket body fragments — notable neighbours include ONEWEB-0050, STARLINK-3055, STARLINK-3109. This makes it one of the more crowded altitude bands, containing roughly 6.8% of all active satellites. With an inclination of 98.3°, UPM/LBSAT passes over latitudes between 98.3°N and 98.3°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. Spain operates approximately 63 active satellites in total, of which 15 share a similar altitude band with UPM/LBSAT.