ELISA E24

ELISA E24 is an active satellite operated by DGA (Arms Procurement Agency)/Centre National d'Etudes Spatiales (CNES) (France), launched on 2011-12-17 from Guiana Space Centre, French Guiana on the Elisa 1 launch. After 15 years in orbit, it continues to be tracked by global surveillance networks. It orbits in Low Earth Orbit (LEO) at altitudes between 595 km and 597 km with an inclination of 97.7°. It travels at approximately 27,230 km/h (7.56 km/s), completing one full orbit every 97 minutes — that’s roughly 14.91 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 ~3–10 years. Orbital Radar tracks ELISA E24 in real time using the latest two-line element set (TLE) data, providing live position, altitude, speed and orbital path updated continuously.

ELISA E24 orbits at an average altitude of 596 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 ELISA E24’s average altitude, there are currently 1,392 active payloads and 691 tracked debris or rocket body fragments — notable neighbours include ONEWEB-0050, STARLINK-3005, STARLINK-3055. This makes it one of the more crowded altitude bands, containing roughly 7.3% of all active satellites. With an inclination of 97.7°, ELISA E24 passes over latitudes between 97.7°N and 97.7°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 125 active satellites in total, of which 35 share a similar altitude band with ELISA E24.