CICLOPS: Cassini Imaging Central Laboratory for OPerationS
Moons that Pass in the Night

Moons that Pass in the Night
PIA 09897

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  Two of Saturn's ring moons draw close momentarily, before the inner of the pair speeds off alone.

Atlas (30 kilometers, 19 miles across, at center right) passes Prometheus (86 kilometers, 53 miles across, at center left) about once a month, then slowly and steadily pulls ahead of its slower moving sibling.

This view looks toward the unilluminated side of the rings from about 23 degrees above the ringplane.

The image was taken in visible light with the Cassini spacecraft narrow-angle camera on April 6, 2008. The view was acquired at a distance of approximately 1.6 million kilometers (975,000 miles) from Atlas. Image scale is 9 kilometers (6 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: May 8, 2008 (PIA 09897)
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