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What is the Cassini division?

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Saturn
Saturn Saturn and its spectacular rings, in a natural-color composite of 126 images taken by the Cassini spacecraft on October 6, 2004. The view is directed toward Saturn's southern hemisphere, which is tipped toward the Sun. Shadows cast by the rings are visible against the bluish northern hemisphere, while the planet's shadow is projected on the rings to the left.

The Cassini division is the most prominent gap within the major ring system of Saturn. Located between the planet's A and B rings, it was discovered in 1675 by the Italian-born French astronomer Gian Domenico Cassini.12

While it appears as a dark line or gap when viewed from Earth, the region is not entirely devoid of particles; it exhibits complex variations in optical depth. The division is approximately 4,700 km wide and is situated between 1.95 and 2.02 Saturn radii.1

The formation of the Cassini division is linked to gravitational interactions within the Saturnian system. Specifically, the inner edge of the division is maintained by a 2:1 orbital resonance with the moon Mimas, meaning that ring particles in that location orbit Saturn exactly twice for every one orbit completed by the moon. This resonant interaction, along with other gravitational perturbations, helps sculpt the structure of the rings.13