Thanks Dan !!
And it´s impressive how using a slow timestep (<40seconds) and Accuracy Mode function, the ISON close approach with Sun turns much more precise !!!
I did another simulation entering the Mars Express in orbit around Mars to see if the comet Siding Spring will really offer risk to this probe (and anothers that are in orbit of Mars) in the close approach with red planet in October of 2014.
All data from JPL Horizons.