[m21sniper]

That's how i'd approach it i guess. Just hit it with repeated deep penetrator warheads (nuke) starting at the farthest range possible, until the whole thing is broken into more manageable pieces that could then be intercepted (if necessary) on their terminal approach by HTK interceptors.

I'd think that if we started shooting at an asteroid that's still 2 weeks from impact with say 1 deep penetrating nuke missile an hour, that by the time it got here there would not be much left.