SEDSAT 1

SEDSAT 1 is an active satellite operated by United States, launched on 1998-10-24 from Cape Canaveral, Florida. With over 28 years in orbit, it has far exceeded many satellites’ design lifetimes. It orbits in Low Earth Orbit (LEO) at altitudes between 540 km and 1,021 km with an inclination of 31.4°. It travels at approximately 26,877 km/h (7.47 km/s), completing one full orbit every 100 minutes — that’s roughly 14.33 orbits per day. At its current altitude, the estimated orbital lifetime before atmospheric re-entry is ~25–100 years. Orbital Radar tracks SEDSAT 1 in real time using the latest two-line element set (TLE) data, providing live position, altitude, speed and orbital path updated continuously.

SEDSAT 1 orbits at an average altitude of 781 km in the mid-LEO band, where atmospheric drag is minimal but radiation exposure remains manageable. Objects at this altitude persist for decades to centuries, making debris mitigation critical. This regime is popular for remote sensing constellations and scientific instruments that need stable, long-duration orbits. Within ±50 km of SEDSAT 1’s average altitude, there are currently 417 active payloads and 2,197 tracked debris or rocket body fragments — notable neighbours include NOAA 20, ONEWEB-0179, ONEWEB-0455. With an inclination of 31.4°, SEDSAT 1 passes over latitudes between 31.4°N and 31.4°S, covering the tropical and temperate zones where most of the world’s population resides. Low-to-mid inclination orbits are efficient to reach from equatorial and mid-latitude launch sites. United States operates approximately 12,360 active satellites in total, of which 154 share a similar altitude band with SEDSAT 1.