On 2026-06-18 21:07 UTC, RUCOSMOS 1638 and RUCOSMOS 2012 reached a closest approach (TCA) of 8.02 km, with a relative velocity of 10.44 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.