Enceladus peeks over the limb of Dione during a partial occultation.

Dione (1,123 kilometers, or 698 miles across), like most of Saturn's icy moons, has a rather bright, reflective surface. But Enceladus is far and away brighter. As the most reflective body in the Solar System, Enceladus returns to space about 99 percent of the visible light that strikes it.

The spray that issues from the geologically active south polar region of Enceladus (504 kilometers, or 313 miles across) coats the moon in fresh, white ice and replenishes Saturn's E ring.

Images like this are extremely useful for scientists, as they show both moons together at approximately the same solar illumination angle. This gives a reference point for researchers to compare data about how the moons reflect light when they are not seen together on the sky.