CICLOPS: Cassini Imaging Central Laboratory for OPerationS
Brightness Bucks the Dark

Dramatic differences between dark and light embellish this Cassini image of Saturn, its rings and its moons Dione and Enceladus.

Saturn's northern and southern latitudes appear dark in this image because of the camera filter used. This view uses a spectral filter sensitive to absorption of certain wavelengths of light by methane in Saturn's atmosphere. Compared to the equatorial region which appears bright, in the dark northern and southern latitudes the light at these wavelengths reaches slightly greater depth before being reflected off the cloud tops and it passes through more light-absorbing methane along the way.

Dione (1123 kilometers, 698 miles across) can be seen on the left of the image. Enceladus (504 kilometers, 313 miles across) is visible on the right.

This view looks toward the northern, sunlit side of the rings from just above the ringplane.

The image was taken with the Cassini spacecraft wide-angle camera on Oct. 21, 2009 using a spectral filter sensitive to wavelengths of near-infrared light centered at 890 nanometers. The view was obtained at a distance of approximately 2.5 million kilometers (1.6 million miles) from Saturn and at a Sun-Saturn-spacecraft, or phase, angle of 104 degrees. Image scale is 143 kilometers (89 miles) per pixel.

The Cassini Equinox Mission is a joint United States and European endeavor. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter was designed, developed and assembled at JPL. 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 Equinox Mission visit, and

Credit: NASA/JPL/Space Science Institute
Released: December 21, 2009 (PIA 11649)
Image/Caption Information
  Brightness Bucks the Dark
PIA 11649

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