CICLOPS: Cassini Imaging Central Laboratory for OPerationS
Dione's Transition Zone

Dione's dark trailing hemisphere and bright leading hemisphere are both visible in this view centered on the moon's anti-Saturn facing side.

The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Sept. 21, 2008 at a distance of approximately 863,000 kilometers (537,000 miles) from Dione and at a Sun-Dione-spacecraft, or phase, angle of 30 degrees. Image scale is 5 kilometers (3 miles) per pixel.

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: January 5, 2009 (PIA 10549)
Image/Caption Information
  Dione's Transition Zone
PIA 10549

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