DMSP 5D-2 F15 (USA 147)

DMSP 5D-2 F15 (USA 147) is an active satellite operated by DoD/NOAA (United States), launched on 1999-12-12 from Vandenberg SFB, California. With over 27 years in orbit, it has far exceeded many satellites’ design lifetimes. It orbits in Low Earth Orbit (LEO) at altitudes between 826 km and 841 km with an inclination of 99.0°. It travels at approximately 26,777 km/h (7.44 km/s), completing one full orbit every 102 minutes — that’s roughly 14.18 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. At its current altitude, the estimated orbital lifetime before atmospheric re-entry is ~100–500 years. Orbital Radar tracks DMSP 5D-2 F15 (USA 147) in real time using the latest two-line element set (TLE) data, providing live position, altitude, speed and orbital path updated continuously.

DMSP 5D-2 F15 (USA 147) orbits at an average altitude of 834 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 DMSP 5D-2 F15 (USA 147)’s average altitude, there are currently 285 active payloads and 2,184 tracked debris or rocket body fragments — notable neighbours include NOAA 20, ONEWEB-0179, ONEWEB-0455. With an inclination of 99.0°, DMSP 5D-2 F15 (USA 147) passes over latitudes between 99.0°N and 99.0°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 12,339 active satellites in total, of which 54 share a similar altitude band with DMSP 5D-2 F15 (USA 147).