Apod

This image, taken by Cassini, shows Janus, a potato-shaped moon of Saturn. Janus has a highly irregular orbit, and frequently trades places with another irregularly-shaped moon, Epimetheus. At its largest diameter, it's 190 kilometers across. Since only fairly large craters are visible to the Cassini, it's been hypothesized that a layer of fine duct covers the planet, hiding the smaller craters. This fine dust layer is believed to be on the moons Pandora and Telesto too.This particular photo was captured by Cassini in late September.