CICLOPS: Cassini Imaging Central Laboratory for OPerationS
Switcharoo Moons

Outside the soft edge of the F ring, Epimetheus (113 kilometers, 70 miles across) and Janus (179 kilometers, 111 miles across) negotiate their nearly-shared orbit. The two moons' orbits are typically about 50 kilometers (30 miles) apart, and the moons actually change orbits every few years: one moon becoming the innermost of the pair, the other becoming the outermost.

The image was taken in visible light with the narrow angle camera on September 8, 2005, from a distance of approximately 1.5 million kilometers (1 million miles) from Saturn. The image scale is about 11 kilometers (7 miles) per pixel on the two moons.

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: October 25, 2005 (PIA 07615)
Image/Caption Information
  Switcharoo Moons
PIA 07615

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