On 2026-06-17 18:28 UTC, RUCOSMOS 1842 and USFLOCK 4Q 28 reached a closest approach (TCA) of 7.34 km, with a relative velocity of 10.54 km/s. This is a cross-border encounter between objects operated by different nations, the kind of event closely watched for space-security implications. 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.