CICLOPS: Cassini Imaging Central Laboratory for OPerationS

Two-Faced Janus
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Janus imitates its two-faced Greek god namesake by catching light on two sides.

The brighter side of Janus is lit by the sun while light reflected off Saturn dimly illuminates the rest of the moon and reveals the non-spherical shape of this small satellite.

This image has been scaled to twice its original size. This view looks toward the leading hemisphere of the Janus (179 kilometers, 111 miles across). North on Janus is up and rotated 22 degrees to the left.

The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Feb. 12, 2009. The view was obtained at a distance of approximately 1 million kilometers (632,000 miles) from Janus and at a Sun-Janus-spacecraft, or phase, angle of 112 degrees. Scale in the original image was 6 kilometers (4 miles) per pixel. The image has been magnified by a factor of two to aid visibility.

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: March 16, 2009 (PIA 10599)
Image/Caption Information
  Two-Faced Janus
PIA 10599

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