Janus' Polar Crater

Caption NASA:"A large crater on Saturn's tiny moon Janus is distinctly visible in this Cassini Spacecraft image. Lit terrain seen here is on the Leading Hemisphere of Janus (approx. 179 Km, or about 111 miles across). North on Janus is up and rotated 7° to the left.

The image was taken in Visible Light with the Cassini Spacecraft narrow-angle camera on March 5, 2009. The view was acquired at a distance of approx. 1,1 MKM (about 684.000 miles) from Janus and at a Sun-Janus-Spacecraft, or Phase, Angle of 53°. Resolution in the original image was roughly 6 Km (about 4 miles) per pixel.
The image has been magnified by a factor of two to aid visibility".