CICLOPS: Cassini Imaging Central Laboratory for OPerationS
Activity Past Dark Side

Saturn's moon Enceladus, seen beyond the outline of the planet's night side, spews water ice from its south polar region.

Enceladus is farther from Cassini than the planet is here. The plumes can be faintly seen at the bottom of the moon in this image. See PIA11688 to learn more about Enceladus (504 kilometers, 313 miles across).

This unusual view of the planet and rings is possible because some sunlight scatters through the uppermost part of Saturn's atmosphere to reach Cassini's cameras on the night side of the planet. See PIA12603 for an explanation of this viewing geometry.

This view looks toward the southern, unilluminated side of the rings from about 5 degrees below the ringplane.

Enceladus and its plumes have been brightened by a factor of two relative to the planet and rings.

The image was taken in visible light with the Cassini spacecraft wide-angle camera on Dec. 25, 2009. The view was acquired at a distance of approximately 617,000 kilometers (384,000 miles) from Enceladus and at a Sun-Enceladus-spacecraft, or phase, angle of 174 degrees. Image scale is 37 kilometers (23 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: August 24, 2010 (PIA 12705)
Image/Caption Information
  Activity Past Dark Side
PIA 12705

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Alliance Member Comments
stowaway (Aug 24, 2010 at 7:37 AM):