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A Meteoroid Hits the Moon
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June 13, 2006: There's a new crater on the Moon. It's about 14 meters wide, 3 meters deep and precisely one month, eleven days old.
NASA astronomers watched it form: "On May 2, 2006, a meteoroid hit the Moon's Sea of Clouds (Mare Nubium) with 17 billion joules of kinetic energyâ?"that's about the same as 4 tons of TNT," says Bill Cooke, the head of NASA's Meteoroid Environment Office in Huntsville, AL. "The impact created a bright fireball which we video-recorded using a 10-inch telescope."
Lunar impacts have been seen before--"stuff hits the Moon all the time," notes Cooke--but this is the best-ever recording of an explosion in progress:>>>>FROM>>>http://science.nasa.gov/science-news/science-at-nasa/2006/13jun_lunarsporadic/

i`m not sure of a impact on the moon being witnessed but the most recent and most dramatic was the one that impacted on jupiter after breaking up,shoemaker/levi i seem to recall.