http://www.nasa.gov/mission_pages/dawn/main/index.html
including the 6 km high bright ??ice mountain.
my 2 bob;
an inactive cryo volcano with sun melt on the bright side and 3 recent craters - at 9 o'clock at the base of the mtn, at 9.30 near the summit and at 2 off the mountain. possibly some smaller fresh craters.
inactive because the summit is dark - carbon complexes dust?
the cratered dark side must be shaded by the mtn during 9 hour rotation and 4.6 year orbit?
the melt is brightest from 9 to 11 and the rest stretches back to 4 o'clock so a solstice must be near?
good fun
cheers, L