PROPCUBE 1

PROPCUBE 1 is an active satellite operated by Naval Post-Graduate School (United States), launched on 2015-10-08 from Vandenberg SFB, California. After 11 years in orbit, it continues to be tracked by global surveillance networks. It orbits in Low Earth Orbit (LEO) at altitudes between 509 km and 692 km with an inclination of 64.8°. It travels at approximately 27,221 km/h (7.56 km/s), completing one full orbit every 97 minutes — that’s roughly 14.89 orbits per day. At its current altitude, the estimated orbital lifetime before atmospheric re-entry is ~10–25 years. Orbital Radar tracks PROPCUBE 1 in real time using the latest two-line element set (TLE) data, providing live position, altitude, speed and orbital path updated continuously.

PROPCUBE 1 orbits at an average altitude of 601 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 PROPCUBE 1’s average altitude, there are currently 1,629 active payloads and 663 tracked debris or rocket body fragments — notable neighbours include ONEWEB-0050, STARLINK-3005, STARLINK-3090. This makes it one of the more crowded altitude bands, containing roughly 9.4% of all active satellites. With an inclination of 64.8°, PROPCUBE 1 passes over latitudes between 64.8°N and 64.8°S, covering most populated land masses in both hemispheres. This mid-inclination band balances global coverage with efficient launch energy requirements. United States operates approximately 12,339 active satellites in total, of which 1,094 share a similar altitude band with PROPCUBE 1.