CICLOPS: Cassini Imaging Central Laboratory for OPerationS
Depth of Field

Cassini puts the enormous distances in the Saturn system in perspective with this view of Rhea (1,528 kilometers, 949 miles across) and Prometheus (86 kilometers, 53 miles across).

Rhea sits in the foreground, while Prometheus lingers near the rings about 400,000 kilometers (250,000 miles) beyond. Saturn's cloud tops are about 80,000 kilometers (50,000 miles) farther still.

This view looks toward the unilluminated side of the rings from less than a degree above the ringplane.

The image was taken with the Cassini spacecraft narrow-angle camera on Aug. 13, 2007 using a spectral filter sensitive to wavelengths of infrared light centered at 750 nanometers. The view was acquired at a distance of approximately 4.1 million kilometers (2.5 million miles) from Saturn. Image scale is 24 kilometers (15 miles) per pixel on Saturn and 21 kilometers (13 miles) per pixel on Rhea.

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: September 28, 2007 (PIA 09738)
Image/Caption Information
  Depth of Field
PIA 09738

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Alliance Member Comments
Ed Rolko (Sep 28, 2007 at 11:47 AM):
At first I couldn't find Prometheus, until I adjusted my display contrast and brightness settings to a higher level. Now I really appreciate what a great image this is.