Comet Tempel 1 Impact

On July 4, 2005 at 05:52 UTC (01:52 EDT), Tempel 1 was impacted by the NASA Deep Impact probe, one day before perihelion. Earth-bound and space telescopes observed brightening of several magnitude after the impact while Deep Impact's observation section recorded a bright spray from the impact site.
The crater that formed was up to 200 meters in diameter and 30-50 meters deep.