ETV-A1

ETV-A1 is an active satellite operated by Sen (United Kingdom), launched on 2022-01-13 from Cape Canaveral Space Force Station, United States on the Transporter-3 launch. It orbits in Low Earth Orbit (LEO) at altitudes between 435 km and 443 km with an inclination of 97.3°. It travels at approximately 27,542 km/h (7.65 km/s), completing one full orbit every 93 minutes — that’s roughly 15.42 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 ~1–3 years. Orbital Radar tracks ETV-A1 in real time using the latest two-line element set (TLE) data, providing live position, altitude, speed and orbital path updated continuously.

ETV-A1 orbits at an average altitude of 439 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 ETV-A1’s average altitude, there are currently 9,809 active payloads and 128 tracked debris or rocket body fragments — notable neighbours include ISS (ZARYA), STARLINK-1017, STARLINK-1039. This makes it one of the more crowded altitude bands, containing roughly 52.5% of all active satellites. With an inclination of 97.3°, ETV-A1 passes over latitudes between 97.3°N and 97.3°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. United Kingdom operates approximately 723 active satellites in total, of which 6 share a similar altitude band with ETV-A1.