OPS 6026 (DMSP 4A F1)

OPS 6026 (DMSP 4A F1) is an active satellite operated by USAF SSD (United States), launched on 1966-09-16 from Vandenberg Space Force Base, United States on the DAPP 1416 launch. After more than 60 years in orbit, it is one of the longest-surviving objects in the space catalogue. It orbits in Low Earth Orbit (LEO) at altitudes between 663 km and 828 km with an inclination of 98.4°. It travels at approximately 26,943 km/h (7.48 km/s), completing one full orbit every 100 minutes — that’s roughly 14.44 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 ~25–100 years. Orbital Radar tracks OPS 6026 (DMSP 4A F1) in real time using the latest two-line element set (TLE) data, providing live position, altitude, speed and orbital path updated continuously.

OPS 6026 (DMSP 4A F1) orbits at an average altitude of 746 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 OPS 6026 (DMSP 4A F1)’s average altitude, there are currently 420 active payloads and 2,083 tracked debris or rocket body fragments — notable neighbours include ONEWEB-0179, LANDSAT 9. With an inclination of 98.4°, OPS 6026 (DMSP 4A F1) passes over latitudes between 98.4°N and 98.4°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 13,279 active satellites in total, of which 176 share a similar altitude band with OPS 6026 (DMSP 4A F1).