So when's the asteroid getting here?

I've blogged about the possibility of Lembit Öpik running for Mayor of London before (see Is London doomed?) but it seems he's really is considering it! (BBC News: Lib Dem Öpik 'may run for mayor')

He is at least aware of a serious problem:

The only issue is my constituency is 205 miles away.

Here's the map again for anyone who wants to check, courtesy of Liberal Democrat Voice: Lembit for London:

But if Öpik does run, I'm scared for London. Being backed by Öpik is a kiss of death. So when's the asteroid getting here?