Well the Roche limit is dependent upon the internal dynamics of the affected object. And the Hill sphere does not come into play, because ISON’s median outgoing trajectory has nothing to do with the exit spread of disrupted or shattered nucleus objects.
But hey, whatever. In a few weeks we’ll know one way or another.
And then P.B. will post another 'live over Romania' video...
We're all gonna die. In a few weeks you'll see I'm right..
Who's got the popcorn?