On 2026-06-16 05:01 UTC, RUCOSMOS 977 and RUCOSMOS 1879 reached a closest approach (TCA) of 4.58 km, with a relative velocity of 6.80 km/s. Miss distance and time of closest approach are computed by propagating the latest published orbital elements (TLEs) for both objects. Values update as new element sets are published. Learn more on the Satellite Maneuver Tracker, and see space situational awareness for context.