A possible satellite collision could happen 13 hours from now, at 17:18 UTC. The two objects involved are 1978-042A, a USAF DMSP satellite, and 1981-041B, a Kosmos-3M second stage.
— Space Scout (@WeAreSpaceScout) April 9, 2021
Collision risk is over 20% at a relative velocity of ~14.6 km/s. Expected miss distance is <10m. https://t.co/TDMRyt0MNE