Two Satellites Might Collide Hours From Now - IRAS vs GGSE-4

Edit: no giant flashes were observed so it looks like a narrow miss was the result.
Based on information from satellite tracker LeoLabs there's a significant chance that two old satellites might collide at a speed of 14.7km/sec over the US tonight (January 29th, 2020). The odds are still small, but the consequences are big so amateur astronomers are setting up to monitor this event.

LeoLabs visualization:


The thumbnail uses an image from FlightClub:

GGSE-4