These are the impact effects:
http://impact.ese.ic.ac.uk/cgi-bin/crater.cgi?dist=5000&distanceUnits=1&diam=8&diameterUnits=2&pdens=&pdens_select=1500&vel=48&velocityUnits=1&theta=45&tdens=1000&wdepth=2000&wdepthUnits=1
everyone in a place that was far away (in the simulation I did put 5000km), would be good... :D