Issue 103

On Closer Inspection: Cosmos 2558 & 2576 Ops

Russia currently operates 2 satellites in Low Earth Orbit (LEO) that are co-planar with US national security satellites. On 1 Aug 2022, Russia launched Cosmos 2558 (53323) into a co-planar orbit with USA 326 . More recently, on 16 May 2024, Russia launched Cosmos-2576 into a co-planar orbit with USA 314 . The first…

Russia currently operates 2 satellites in Low Earth Orbit (LEO) that are co-planar with US national security satellites. On 1 Aug 2022, Russia launched Cosmos 2558 (53323) into a co-planar orbit with USA 326. More recently, on 16 May 2024, Russia launched Cosmos-2576 into a co-planar orbit with USA 314. The first instance of this behavior occurred on 25 Nov 2019 when Russia launched Cosmos 2542 (44797) into a co-planar orbit with USA 245, however Cosmos 2542 re-entered the Earth’s atmosphere on 24 Oct 2023. With the assistance of Nathan Parrott of Saber Astronautics, we take a closer look at Cosmos-2576/USA 314 & Cosmos-2558/USA 326. For the USA satellites, we used orbital data from Mike McCants’ Satellite Tracking Web Pages.

Cosmos 2576

– Russia launched a Soyuz-2.1b from Plesetsk with Cosmos 2576 and 9 additional payloads (including 2 of the Sputnix Zorky-2M satellites mentioned in the previous article). The launch prompted an rapid response from the US Department of Defense after it became apparent that Cosmos 2576 was co-planar with a US national security satellite (USA 314).

– Per Dr Marco Longbroek’s SatTrackCam Leiden (b)log: “Cosmos-2576 orbital plane might not be random. As was first pointed out by Bob Christy, the orbital plane closely matches that of the American KH-11 ADVANCED CRYSTAL spy satellite USA 314 (2021-032A).”

– “Cosmos 2576, differs in RAAN with USA 314 by only 0.02 degrees, and in inclination by only 0.8 degrees. Its current orbital altitude (451 x 436 km) is lower than that of USA 314 (769 x 548 km), but both orbital altitude and inclination are the same as that of a previous ‘inspector satellite’.”

– Based on Celestrak data it appears Cosmos 2576 has adjusted its orbit 3 times. In each instance the spacecraft appears to perform 3 SMA boosts, the past 2 maneuvers appear to be similar with an overall increase of 6.2km on 29 Jun and 5.6km on 31 July. In both cases Cosmos 2576 maneuvered to reach a 451.6km SMA.

– Orbital orbital relationship with USA 314: Every 1.5 days Cosmos-2576 has a ~269km Point of Closest Approach (POCA) with USA 314. Solar phase angle (SPA) varies for each POCA event. In the case of the POCA event on 14 Aug 2024, the sun is nearly directly behind USA 314 making any imaging from Cosmos 2576 virtually impossible.




Cosmos 2558

– Russia launched a Soyuz 2.1v on 1 Aug 2022 carrying Cosmos 2558 into a Polar orbit. Astronomers noted that Cosmos 2558’s orbit was co-planar with US national security satellite USA-326. The US DoD also released a statement.

– Just 3 days later, on 4 Aug 2022, Cosmos 2558 had a ~67kms POCA with USA 326.

– On 29 Sep 2022 Cosmos 2558 made a small orbit raising maneuver to fine-tune its RAAN precession to match that of USA 326.

-Analysis of Cosmos 2558 orbital history reveals the satellite raises its orbit on average 5.5km every 40 days to restore its 466.1km SMA.

– Orbital orbital relationship with USA 326: Cosmos 2558 has an ~50km point of closest approach (POCA) every 7.26 days. As with Cosmos 2576 the solar phase angle (SPA) varies each POCA event. In the case of the 10 Aug 2024 POCA event, Cosmos 2558 had favorable lighting conditions with respect to USA 326 as it moved from 200km to 100km from USA 326. However, by the time the two satellites closed to within 100 km both had transitioned to the night side of the Earth, which would prevent effective optical imaging.

Watch This Space: Barring any orbital adjustments, Cosmos 2558 and Cosmos 2576 will simultaneously approach USA 314 and USA 326 (respectively) on 12, 18 & 24 September 2024.