Mimas:large impact structure PIA02266
This Voyager 1 picture of Mimas shows a large impact structure at 110 W longitude, located on that face of the moon which leads Mimas in its orbit. The feature, about 130 km in diameter, is more than one quarter the diameter of the entire moon.
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Image Credit: JPL, NASA  

This Voyager 1 picture of Mimas shows a large impact structure at 110 W Long., located on that face of the moon which leads Mimas in its orbit. The feature, about 130 kilometers in diameter, is more than one-quarter the diameter of the entire moon. This is a particularly interesting feature in view of its large diameter compared with the size of the satellite, and may have the largest crater diameter/satellite diameter ratio in the solar system. The crater has a raised rim and central peak, typical of large impact structures on terrestrial planets. Additional smaller craters, 15-45 kilometers in diameter, can be seen scattered across the surface, particularly along the terminator. This photo was taken on November l2, from a range of approximately 660,000 km.

Mimas is one of the smaller Saturnian satellites with a low density implying its chief component is ice.
 
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