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Dione
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Dione Cracks on Dione Helene Dione Rhea and Dione Tethys (above) and Dione, two satellites of Saturn, as observed by the Voyager 1 spacecraft. The shadow of Tethys is visible on the planet's “surface,” just below the rings (bottom right). False-colour image of Saturn. Three of its satellites (Tethys, Dione, and Rhea) are visible as bright points on the left; a fourth moon, Mimas, can be seen in front of Saturn, below the ring system. This image is based on observations made by the Voyager spacecraft. Hubble Space Telescope: Saturn and moons False-colour images of the ring and satellites of Saturn, taken by the Hubble Space Telescope, Nov. 21, 1995. The satellite Dione appears just above the rings in the first two images; Mimas is visible at the outer edge of the rings; and other moons are visible near Saturn's disk on the right.
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Dione
Dione An image of Dione, a moon of Saturn, taken by the Cassini spacecraft on July 24, 2006.

Dione

moon of Saturn
Written by
William B. Hubbard
Professor of Planetary Sciences, University of Arizona, Tucson. Author of Planetary Interiors.
William B. HubbardAll
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History

Dione, fourth nearest of the major regular moons of Saturn. It was discovered by the Italian-born French astronomer Gian Domenico Cassini on March 21, 1684, and named for a daughter of the Titan Oceanus in Greek mythology. Dione has a diameter of 1,118 km (695 miles) and revolves around Saturn in a prograde (in the same direction as Saturn’s rotation, counterclockwise as viewed from above the planet’s north pole), nearly circular orbit at a mean distance...

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