The tall, cone-shaped mountain Ahuna Mons is seen in this image taken by NASA's Dawn spacecraft. Ahuna Mons, named for the traditional post-harvest festival of the Sumi tribe of Nagaland in India, is about 4 miles (6 kilometers) tall and 12 miles (20 kilometers) in diameter.
Dawn took this image on Oct. 14, 2015, from an altitude of 915 miles (1,470 kilometers). It has a resolution of 450 feet (140 meters) per pixel.
http://photojournal.jpl.nasa.gov/catalog/PIA20130