It seems there may be loads of entire planets cannon balling through space but again the chances of getting hit are slim.
Was that complete coincidence or did they come from the same direction?
Apparently there is a fairly large one that currently has a 1% chance of a hit in 2048.
The odds of a hit in a populated area are low, but I doubt NASA can give strike positions accurate enough to be really meaningful.
Maybe they could say an asteroid will hit the East coast of USA and the blast might be 2M tonnes, but is that helpful?
If they can hit n ICBM i thing they can hit a meteorite.
With a little help from MIT...http://web.mit.edu/newsoffice/2012/deflecting-an-asteroid-with-paintballs-1026.html
And helping the initial blast to break the meteorite is the best idea, in the hope smaller fragment will "burn" faster and not hit the ground
But to capture a mountain moving at orbital speed will take more than anything made so far.