Originally Posted by carl37
It won't pass very close to us Brent - it will be way south of the Earth's orbital plane when it passes us. It also doesn't get very close to the sun so it probably won't be super bright either.
I tried generating a 3D plot with gnuplot from JPL ephemeris for the two. This is the closest they appear to get. They cross at close to 90° - Mars moving in RA, C/2013 A1 moving in Dec.
Z is in AU from the Sun.