Um, there are some solar flares that are suppose to be fudging with some magnetic fields tomorrow or the day after. Look for the aurora, btw. It should be nice.
The Delta Aquarid meteor shower should arrive at 3-4am on the 18th.
Not sure about any impact news. Ar we talking something big or small? Deep Impact, or golf ball?
Edit: All I could find was this
http://www.usatoday.com/tech/science...tial-hit_x.htm