CICLOPS: Cassini Imaging Central Laboratory for OPerationS
Tethys in Full View

Tethys in Full View
PIA 07738

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  With this fabulous, full-disk mosaic, Cassini presents the best view yet of the south pole of Tethys.

The giant rift Ithaca Chasma cuts across the disk. Much of the topography seen here, including that of Ithaca Chasma, has a soft, muted appearance. It is clearly very old and has been heavily bombarded by impacts over time.

Many of the fresh-appearing craters (ones with crisp relief) exhibit unusually bright crater floors. The origin of the apparent brightness (or "albedo") contrast is not known. It is possible that impacts punched through to a brighter layer underneath, or perhaps it is brighter because of different grain sizes or textures of the crater floor material in comparison to material along the crater walls and surrounding surface.

The moon's high southern latitudes, seen here at bottom, were not imaged by NASA's Voyager spacecraft during their flybys of Tethys 25 years ago.

The mosaic is composed of nine images taken during Cassini's close flyby of Tethys (1,062 kilometers, 660 miles across) on September 24, 2005, during which the spacecraft passed approximately 1,500 kilometers (930 miles) above the moon's surface.

This view is centered on terrain at approximately 1.2 degrees south latitude and 342 degrees west longitude on Tethys. It has been rotated so that north is up.

The clear filter images in this mosaic were taken with the narrow angle camera from distances ranging from 71,600 kilometers (44,500 miles) to 62,400 kilometers (38,800 miles) from Tethys and at a Sun-Tethys-spacecraft, or phase, angle of 21 degrees. The image scale is 370 meters (1,200 feet) 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: September 29, 2005 (PIA 07738)
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