DYNAMICS EXPLORER 1

DYNAMICS EXPLORER 1 is an active satellite operated by GSFC (United States), launched on 1981-08-03 from Vandenberg Space Force Base, United States on the DE A launch. With over 45 years in orbit, it has far exceeded many satellites’ design lifetimes. It orbits in Medium Earth Orbit (MEO) at altitudes between 524 km and 23,163 km with an inclination of 91.0°. It travels at approximately 16,841 km/h (4.68 km/s), completing one full orbit every 6 hours 48 minutes — that’s roughly 3.53 orbits per day. Its orbital eccentricity of 0.6215 gives it a noticeably elliptical path, with significant altitude variation between perigee and apogee. Orbital Radar tracks DYNAMICS EXPLORER 1 in real time using the latest two-line element set (TLE) data, providing live position, altitude, speed and orbital path updated continuously.

DYNAMICS EXPLORER 1 orbits at an average altitude of 11,844 km in Medium Earth Orbit, the region between LEO and GEO (2,000–35,786 km). MEO’s higher altitude gives each satellite a much larger ground footprint than LEO, meaning fewer spacecraft are needed for global coverage — but signal latency is higher and radiation from the Van Allen belts is a significant design constraint. Within ±50 km of DYNAMICS EXPLORER 1’s average altitude, there are currently 2 active payloads and 4 tracked debris or rocket body fragments. This is a relatively sparse altitude band, containing less than 1% of all active satellites. With an inclination of 91.0°, DYNAMICS EXPLORER 1 passes over latitudes between 91.0°N and 91.0°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 States operates approximately 13,373 active satellites in total, of which 2 share a similar altitude band with DYNAMICS EXPLORER 1.