Asimov is an 84-kilometer diameter crater located in the southern ancient highlands of Mars. It is distinguished from other craters in this region in that it contains both a ring-depression just within the crater rim and a pit near the center.
Gullies have formed along slopes both in the ring-depression and within the central pit. A closeup shows gullies and recurring slope lineae (RSL) along the eastern slope of the pit. These features continue to form seasonally in this region and the HiRISE team monitors this and other sites to look for changes….