If i am flying past an asteriod and my template does not overlap an asteriod but the base of my ship does as I fly past (i did not land ontop of it), do I still roll for hitting it and lose an action or does the template only have to go through the rock to hit it and lose an action?

Nope. If you do not land on the asteroid and your template doesn't overlap it, you are fine (even if your base would have overlapped on the way).

a4rino said:

You are right, the only important is where the base landing or if the template pass for the asteroid, all the rest of the events are good, greettings.