CICLOPS: Cassini Imaging Central Laboratory for OPerationS
Look-alike Moons

Look-alike Moons
PIA 12760

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  Rhea and Dione seem like dark and light fraternal twins in this Cassini image with each of these two Saturnian moons displaying a large crater oriented similarly in the northern hemisphere.

Rhea, on the left, is closer to the Cassini spacecraft than Dione in this view. Saturn is out-of-frame, far to the right of this view.

Lit terrain seen here is on the anti-Saturn side of Rhea (1528 kilometers, 949 miles across) and the leading hemisphere of Dione (1123 kilometers, 698 miles across). North on the moons is up.

The image was taken in visible blue light with the Cassini spacecraft narrow-angle camera on Feb. 3, 2011. The view was acquired at a distance of approximately 1.2 million kilometers (746,000 miles) from Rhea and at a Sun-Rhea-spacecraft, or phase, angle of 75 degrees. The view was acquired at a distance of approximately 1.9 million kilometers (1.2 million miles) from Dione and at a Sun-Dione-spacecraft, or phase, angle of 75 degrees. Image scale is 7 kilometers (4 miles) per pixel on Rhea and 11 kilometers (7 miles) per pixel on Dione.

The Cassini Solstice Mission is a joint United States and European endeavor. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter was designed, developed and assembled at JPL. 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 Solstice Mission visit, and

Credit: NASA/JPL/Space Science Institute
Released: April 4, 2011 (PIA 12760)
Image/Caption Information

Alliance Member Comments
Red_dragon (Apr 6, 2011 at 3:41 AM):
+1, Nekto. 100% agreed.
NeKto (Apr 4, 2011 at 8:51 AM):
the art of science, the science of art.
Another outstanding image. Thanks again to the whole CICLOPS crew.