Issue 138

Russia: Checking in on the Nivelirs

5 Feb 2026: I thought it was about time to check in on the Russian satellites operating in near-coplanar orbits with high-value US satellites. Thanks again to the SaberAstro crew for their fantastic SBMS application! Important note: Orbital data for the USA satellites courtesy of the McCants catalog. This is the best…

5 Feb 2026: I thought it was about time to check in on the Russian satellites operating in near-coplanar orbits with high-value US satellites. Thanks again to the SaberAstro crew for their fantastic SBMS application! Important note: Orbital data for the USA satellites courtesy of the McCants catalog. This is the best data I have access to, but it can be out of date. However, significant changes to the orbital planes (their Inclination or RAAN values) of any of the satellites in question is unlikely due to the fuel requirements to do so. With this limitation, please consider the points of closest approach as theoretical.

– Cosmos 2558 (53323)/Obj C (64627) vs USA 326: Many will recall that Cosmos 2558 began to suffer some difficulties in April 2025 (began missing regular orbital maintenance maneuvers). In June 2025 Cosmos 2558 released its sub-satellite (likely inspector satellite associated with the Nivelir system). Since that time Obj C has conducted maneuvers to maintain its orbit (and remain co-planar with USA 326). For its part, Cosmos 2558 has lost 60km in altitude (SMA) and is no longer co-planar with either Obj C or USA 326.











Orbit Visualization Of USA 326, Obj C & Cosmos 2558 (top left). Notional Close Approach Based on Last Known Orbital Characteristics of USA 326 (top right). Orbit History Graphs of Cosmos 2558 (bottom left) and Object C (bottom right). (sbms.saberastro.com & celestrak.org)

Russia: Checking in on the Nivelirs Continued

Cosmos 2576 (59773) vs USA 314: After its launch in May 2024, Cosmos 2576 gradually?increased its altitude (SMA) from 440kmto ~485km. Cosmos 2576remains nearly co-planar with USA 314. Cosmos 2576 is signficantly lower (155km) than its target (at least for the last TLE we received for USA 314 back in August 2025).






Cosmos 2588 (64095) vs USA 338: Perhaps indicating at new tactic, the latest of Russia’s Nivelir satellites, Cosmos 2588, is maintaining a higher orbit (+91km) than its target, USA 338. We have a fairly updated TLE for USA 338 (20 Jan 2026).





(sbms.saberastro.com)