CICLOPS: Cassini Imaging Central Laboratory for OPerationS
Biggest Saturnian Moons

Biggest Saturnian Moons
PIA 12724

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  A darkly defined Rhea passes before the fuzzy orb of Titan in this Cassini view of Saturn's two largest moons.

Rhea is closer to the spacecraft in this view. See PIA09895 to learn more about Rhea. See PIA08137 to learn about Titan's atmosphere.

Lit terrain seen here is on the Saturn-facing sides of Rhea (1528 kilometers, 949 miles across) and Titan (5150 kilometers, 3200 miles across).

The image was taken in visible blue light with the Cassini spacecraft narrow-angle camera on Nov. 19, 2009. The view was acquired at a distance of approximately 1.1 million kilometers (684,000 miles) from Rhea and at a Sun-Rhea-spacecraft, or phase, angle of 118 degrees. The view was acquired at a distance of approximately 2.3 million kilometers (1.4 million miles) from Titan and at a Sun-Titan-spacecraft, or phase, angle of 118 degrees. Image scale is 7 kilometers (4 miles) per pixel on Rhea and 14 kilometers (9 miles) on Titan.

The Cassini Equinox 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 Equinox Mission visit, and

Credit: NASA/JPL/Space Science Institute
Released: September 20, 2010 (PIA 12724)
Image/Caption Information

Alliance Member Comments
Red_dragon (Sep 24, 2010 at 5:34 PM):
It's truly impressive to see Rhea stacked over Titan.