[crater] The rim of Brunner is well-defined and nearly circular, although there is a slight outward bulge and a depressed wall along the north. The interior of the crater is rugged and irregular, with a central ridge formation at the midpoint. There is also a ring-like formation on the floor that is concentric with the inner wall. ==Satelli... Found on http://en.wikipedia.org/wiki/Brunner_(crater)