Sunday, March 03, 2013
Yet More Updates on the Potential Impact of C/2013 A1 (Siding Spring) with Mars
This is still further out than the 0.00023 AU close approach of 2012 DA14, which missed us by two Earth diameters.
The calculated probability of the comet hitting Mars now is around 0.08%. See Leonid Elenin's article at SpaceObs for more details.