CICLOPS: Cassini Imaging Central Laboratory for OPerationS
Uncovering Rhea

Two Saturnian moons meet in the sky. Dione departs after crossing the face of Rhea for several minutes.

Dione (1,123 kilometers, 698 miles across), at right, has a notably smoother-looking surface than Rhea (1,528 kilometers, 949 miles across), suggesting the former has been modified more recently.

The image was taken in visible light with the Cassini spacecraft narrow-angle camera on May 14, 2006 at a distance of approximately 2.7 million kilometers (1.7 million miles) from Dione and 3.1 million kilometers (1.9 million miles) from Rhea. The Sun-moon-spacecraft, or phase, angle is about 134 degrees on both moons. Image scale is 16 kilometers (10 miles) per pixel on Dione and 18 kilometers (11 miles) per pixel on Rhea.

The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Cassini-Huygens mission for NASA's Science Mission Directorate, Washington, D.C. The imaging team consists of scientists from the US, England, France, and Germany. The imaging operations center and team lead (Dr. C. Porco) are based at the Space Science Institute in Boulder, Colo.

For more information about the Cassini-Huygens mission, visit and the Cassini imaging team home page,

Credit: NASA/JPL/Space Science Institute
Released: June 20, 2006 (PIA 08203)
Image/Caption Information
  Uncovering Rhea
PIA 08203

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