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Caption NASA originale:"Enceladus briefly passes behind the crescent of Rhea in these images, which are part of a so-called "mutual event" (such as an "eclipse") sequence taken by Cassini.
These sequences help scientists refine our understanding of the orbits of Saturn's moons.
The images were taken one minute apart, as smaller Enceladus darted behind Rhea as seen from the Cassini spacecraft's point of view.

The images were taken in visible light with the Cassini spacecraft narrow-angle camera on April 14, 2006, at a distance of approx. 3,4 MKM (such as about 2,1 MMs) from Rhea and 4,1 MKM (about 2,5 MMs) from Enceladus. The image scale is approx. 20 Km (about 13 miles) per pixel on Rhea and 24 Km (roughly 15 miles) per pixel on Enceladus".