CICLOPS: Cassini Imaging Central Laboratory for OPerationS
Diversity of Impacts

Rhea (1,528 kilometers, 949 miles across) displays two large impact features here, along the terminator, plus a superb rayed crater to the east.

The northern basin, named Tirawa, was discovered in Voyager images. This ancient impact site is approximately 360 kilometers (220 miles) across. Another, perhaps larger basin sits to the south of Tirawa and is partly covered in shadow.

This view shows principally the leading hemisphere on Rhea; north is up and rotated about 10 degrees to the left.

The image was taken in visible light with the narrow angle camera on June 2, 2005, from a distance of approximately 1.8 million kilometers (1.1 million miles) from Rhea and at a Sun-Rhea-spacecraft, or phase, angle of 47 degrees. Resolution in the original image was 11 kilometers (7 miles) per pixel. The image has been contrast-enhanced and magnified by a factor of two to aid visibility.

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 11, 2005 (PIA 07539)
Image/Caption Information
  Diversity of Impacts
PIA 07539

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