CICLOPS: Cassini Imaging Central Laboratory for OPerationS

Confining Moons
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Confining Moons
PIA 09853

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  Saturn's shepherd moons gravitationally herd the F ring's particles into a narrow thread.

The structure seen in the inner edge of the F ring in this wide-angle view is similar to that seen in the narrow-angle view PIA09845. Here, Prometheus is seen near the ring's inner edge.

Along with Prometheus (86 kilometers, 53 miles across) and Pandora (81 kilometers, 50 miles across), two background stars are visible in the image. One of the stars is seen in the middle of the F ring.

This view looks toward the unilluminated side of the rings from about 45 degrees above the ringplane.

The image was taken in visible light with the Cassini spacecraft wide-angle camera on Jan. 26, 2008. The view was obtained at a distance of approximately 749,000 kilometers (465,000 miles) from Saturn. Image scale is 45 kilometers (28 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: March 7, 2008 (PIA 09853)
Image/Caption Information