CICLOPS: Cassini Imaging Central Laboratory for OPerationS
The Great Rift

The Great Rift
PIA 06583

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  Ithaca Chasma is one of the two most prominent features on Saturn's moon Tethys (1,062 kilometers, 660 miles across); the other is the gigantic crater Odysseus. Ithaca Chasma is visible near the moon's lower right limb in this image, which does not reveal the branching canyon's full extent.

Discovered in Voyager images, the chasm is 100 kilometers (60 miles) across on average, and is 4 kilometers (2 miles) deep in places. It stretches more than 1,000 kilometers (620 miles) over Tethys' surface, from north to south.

This view is roughly centered on the leading hemisphere of Tethys. The image has been rotated so that north on Tethys is up.

This view was obtained with the narrow angle camera on January 17, 2005, from a distance of approximately 1 million kilometers (621,000 miles) from Tethys and at a Sun-Tethys-spacecraft, or phase, angle of 110 degrees. A spectral filter sensitive to wavelengths of ultraviolet light centered at 338 nanometers was used to capture the image. Resolution in the original image was about 6 kilometers (3.7 miles) per pixel. Contrast was enhanced and the image was 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: February 11, 2005 (PIA 06583)
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