ARIANE 40 R/B

ARIANE 40 R/B is a spent rocket body associated with France, launched on 1991-07-17 from Guiana Space Centre, Kourou on the ERS-1 launch. With over 35 years in orbit, it has far exceeded many satellites’ design lifetimes. It orbits in Low Earth Orbit (LEO) at altitudes between 746 km and 752 km with an inclination of 98.2°. It travels at approximately 26,936 km/h (7.48 km/s), completing one full orbit every 100 minutes — that’s roughly 14.43 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. Spent rocket bodies like ARIANE 40 R/B are among the largest pieces of uncontrolled space debris and are priority targets for collision avoidance manoeuvres and future active debris removal efforts.

ARIANE 40 R/B orbits at an average altitude of 749 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 ARIANE 40 R/B’s average altitude, there are currently 356 active payloads and 1,951 tracked debris or rocket body fragments — notable neighbours include LANDSAT 9. With an inclination of 98.2°, ARIANE 40 R/B passes over latitudes between 98.2°N and 98.2°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. France operates approximately 115 active satellites in total, of which 5 share a similar altitude band with ARIANE 40 R/B.