Wikipedia's LCROSS says:
Centaur impacted successfully on October 9, 2009, at 11:31 UTC. The Shepherding Spacecraft descended through Centaur's ejectate plume, collected and relayed data, impacting six minutes later at 11:37 UTC.
Contrary to media reports at the time, neither the impact nor its dust cloud could be seen from Earth, using the naked eye or telescopes.
But what about the Chang'e 5-T1 mission rocket part (previously misidentified as a SpaceX cis-lunar 2nd stage from the 2015 DSCOVR launch)? It's supposed to hit the Moon on March 4th.
Question: Where will that rocket hit the Moon? Will it be visible from Earth?
- BBC: "In 2009 Prof McDowell & other astronomers performed an experiment in which a similar-sized rocket was crashed into the Moon." Really? Which one?
- BBC: "A rocket launched by Elon Musk's space exploration company is on course to crash into the Moon and explode." Will it really explode?
Hat tip to @BrendanLuke's comment