Issue 137

Update: Chinese GEO Refueling

16 Jan 2026: SJ-21 (49330) and SJ-25 (62485) may have exited RPO conditions in mid-January. Before doing so China appears to have used both spacecraft to train on extremely close Rendezvous Proximity Operations (RPO) sometimes referred to as “Zero Prox Ops.” Based on TLE data the two spacecraft were within 1km of one…

16 Jan 2026: SJ-21 (49330) and SJ-25 (62485) may have exited RPO conditions in mid-January. Before doing so China appears to have used both spacecraft to train on extremely close Rendezvous Proximity Operations (RPO) sometimes referred to as “Zero Prox Ops.” Based on TLE data the two spacecraft were within 1km of one another ~7-8 times from 1-15 January 2026. Quick reminder that TLE data is an average location based on information from several sensors and is not accurate enough for location assessments for GEO objects once they are in close proximity (let’s say <2km). However, after 15 Jan China conducted in-track maneuvers and as of 16 Jan 2026 the two objects were 130km apart. In their current orbits, SJ-25 is separating 50km/day from SJ-21. However, the objects remain co-planar and through minor in-track (easy on fuel) maneuvers could again resume their proximity operations.


SJ-21 & SJ-25 Closed to within 1km of One Another 8x from 1-15 January 2026 (saberastro.com)


SJ-21 & SJ-25 Visualization (saberastro.com)


16 Jan 2026 Optical Image (s2asystems)