@183231bcb Quoting from the appendix to Riley Black's _The Last Days of the Dinosaurs_ (pp 231-232 in the paperback edition I have):
All the same, we know that the asteroid was moving incredibly fast. It's a sobering point to remember, especially given how popular depictions of the asteroid impact often display the likes of _Tyrannosaurus_ and _Triceratops_ watching a terrible streak rip its way across the sky. This probably didn't happen. The inhabitants of the Late Cretaceous world wouldn't have seen much at all in the skies prior to impact. The event happened so fast that there wouldn't have been that telltale shooting star tail passing overhead.