CZ-4B R/B

CZ-4B R/B is a spent rocket body associated with China, launched on 2026-09-10 from Jiuquan, China. As a relatively recent addition to the catalogue, its orbital elements are well-characterised. It orbits in Low Earth Orbit (LEO) at altitudes between 300 km and 518 km with an inclination of 45.1°. It travels at approximately 27,603 km/h (7.67 km/s), completing one full orbit every 93 minutes — that’s roughly 15.53 orbits per day. At its current altitude, the estimated orbital lifetime before atmospheric re-entry is ~1–3 years. Spent rocket bodies like CZ-4B 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.

CZ-4B R/B orbits at an average altitude of 409 km in the core of Low Earth Orbit, the most heavily utilised altitude band. The balance of moderate drag (limiting debris accumulation) and short signal path (enabling low-latency links and high-resolution imaging) makes this regime the default for most commercial and government missions. Within ±50 km of CZ-4B R/B’s average altitude, there are currently 974 active payloads and 102 tracked debris or rocket body fragments — notable neighbours include ISS (ZARYA), STARLINK-1008, STARLINK-1012. This makes it one of the more crowded altitude bands, containing roughly 5.4% of all active satellites. With an inclination of 45.1°, CZ-4B R/B passes over latitudes between 45.1°N and 45.1°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. China operates approximately 1,272 active satellites in total, of which 50 share a similar altitude band with CZ-4B R/B.