DELTA 1 R/B

DELTA 1 R/B is a spent rocket body associated with United States, launched on 1970-03-20 from Cape Canaveral Space Force Station, United States on the NATO IIA launch. After more than 56 years in orbit, it is one of the longest-surviving objects in the space catalogue. It orbits in Medium Earth Orbit (MEO) at altitudes between 286 km and 22,834 km with an inclination of 25.2°. It travels at approximately 16,973 km/h (4.71 km/s), completing one full orbit every 6 hours 38 minutes — that’s roughly 3.61 orbits per day. Its orbital eccentricity of 0.6287 gives it a noticeably elliptical path, with significant altitude variation between perigee and apogee. Spent rocket bodies like DELTA 1 R/B are among the largest pieces of uncontrolled space debris and are priority targets for collision avoidance manoeuvres and future active debris removal efforts.

DELTA 1 R/B orbits at an average altitude of 11,560 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 DELTA 1 R/B’s average altitude, there are currently 0 active payloads and 5 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 25.2°, DELTA 1 R/B passes over latitudes between 25.2°N and 25.2°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 13,343 active satellites in total.