Just like an old "apple": Helene (False Colors)

Caption NASA:"The Cassini spacecraft reveals details on the surface of small, irregularly shaped Helene in this close-up view, obtained during the Spacecraft's closest encounter with this moon during its four-year primary mission.
Helene (32 Km, or 20 miles across) is a Trojan Moon, sharing Dione's orbit but staying 60° or 400.000 Km (about 250.000 miles) ahead of the much larger moon.

The image was taken in visible green light with the Cassini spacecraft narrow-angle camera on July 20, 2007. The view was acquired at a distance of approx. 39.000 Km (such as about 24.000 miles) from Helene and at a Sun-Helene-spacecraft, or phase, angle of 61°.
Image scale is roughly 231 meters (758 feet) per pixel".