CICLOPS: Cassini Imaging Central Laboratory for OPerationS
Irregular Pair

The oddball shapes of Saturn's small ring moons Prometheus (86 kilometers, 53 miles across) and Epimetheus (113 kilometers, 70 miles across) are discernible in the view from Cassini. Saturn's shadow carves a dark, diagonal swath across the ring plane, even occulting the outer edge of thin, knotted F ring.

Prometheus is visible inside the F ring near center, and Epimetheus is seen near the lower right corner. North on Saturn is to the upper right. The view is from beneath the ring plane.

The image was taken in visible light with the narrow angle camera on January 22, 2005, from a distance of approximately 2.6 million kilometers (1.6 million miles) from Saturn. The image scale is 15 kilometers (9 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: February 17, 2005 (PIA 06587)
Image/Caption Information
  Irregular Pair
PIA 06587

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