SSETI-EXPRESS DEB

SSETI-EXPRESS DEB is a tracked piece of space debris attributed to ESA (European Space Agency), launched on 2005-10-27 from PKMTR on the China-DMC launch. With over 21 years in orbit, it has far exceeded many satellites’ design lifetimes. It orbits in Low Earth Orbit (LEO) at altitudes between 639 km and 658 km with an inclination of 98.3°. It travels at approximately 27,128 km/h (7.54 km/s), completing one full orbit every 98 minutes — that’s roughly 14.74 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 ~10–25 years. As orbital debris, SSETI-EXPRESS DEB poses a potential collision risk to operational satellites in nearby orbits and is continuously monitored by the U.S. Space Surveillance Network and other tracking systems.

SSETI-EXPRESS DEB orbits at an average altitude of 649 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 SSETI-EXPRESS DEB’s average altitude, there are currently 693 active payloads and 1,017 tracked debris or rocket body fragments — notable neighbours include TERRA, AQUA. With an inclination of 98.3°, SSETI-EXPRESS DEB 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. ESA (European Space Agency) operates approximately 93 active satellites in total, of which 6 share a similar altitude band with SSETI-EXPRESS DEB.