Issue 137

Update: Cosmos 2589 Inching Toward GEO

16 Jan 2026: As noted in the 7 December 2025 Flash , Cosmos 2589 (64467) began conducting maneuvers to circularize its orbit on 19 Nov 2025 when it began lowering its apogee and raising its perigee. This trend continues and as a result Cosmos 2589's eccentricity has dropped from 0.364 to 0.231 (0.0 = perfect circle)…

16 Jan 2026: As noted in the 7 December 2025 Flash, Cosmos 2589 (64467) began conducting maneuvers to circularize its orbit on 19 Nov 2025 when it began lowering its apogee and raising its perigee. This trend continues and as a result Cosmos 2589’s eccentricity has dropped from 0.364 to 0.231 (0.0 = perfect circle). To date, Cosmos 2589 apogee has decreased ~5,500km and its perigee has increased 5,340km. Russia continues conducting in-track maneuvers every 12hrs and is likely to continue to do so until Cosmos 2589’s orbit has circularized, at which time it will be in proximity with the Geostationary belt. From this orbit it will be able to patrol GEO and potentially conduct inspection missions. Cosmos 2589’s RPO partner, its subsatellite Cosmos 2590 (64527), has not maneuvered since early-December 2025. The two satellites now briefly cross paths twice per orbit (see graphic).


Cosmos 2589’s Orbit Continues to Circularize (get skinny in this view), while Cosmos 2589 remains consistent (spacemap42.com)


Cosmos 2589 Orbit History Showing Steady Increase in Perigee and Decrease in Apogee Resulting in Declining Eccentricity (celestrak.org)