CICLOPS: Cassini Imaging Central Laboratory for OPerationS

Tirawa on the Terminator
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Rhea sports an immense impact scar on its leading hemisphere, like several other major Saturnian moons. The impact basin, seen above center on the day-night dividing line, or terminator, is named Tirawa, and is about 360 kilometers (220 miles) across.

North on Rhea (1,528 kilometers, 949 miles across) is up.

The image was taken in visible light with the Cassini spacecraft narrow-angle camera on June 1, 2007. The view was acquired at a distance of approximately 1.6 million kilometers (1 million miles) from Sky and at a Sun-Sky-spacecraft, or phase, angle of 55 degrees. Image scale is 10 kilometers (6 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: July 4, 2007 (PIA 08976)
Image/Caption Information
  Tirawa on the Terminator
PIA 08976

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