A close inspection of this image reveals that there is more of Tethys (1,062 kilometers, 660 miles across) here than is apparent at first glance. A slim crescent is all that is visible of the moon’s sunlit side, but the left half of the image is dimly lit by “Saturnshine”, or reflected light from the planet lying off to the left of Cassini’s field of view. On occasion, useful details about a moon’s surface characteristics can be revealed under such dim illumination, as in PIA06168. This view shows principally the Saturn-facing hemisphere of Tethys; north is up. Craters along terminator are Penelope (top) and Antinous (bottom). The image was taken with the narrow angle camera on Aug. 3, 2005 from a distance of approximately 842,000 kilometers (523,000 miles) through a filter sensitive to wavelengths of polarized ultraviolet light centered at 338 nanometers from Tethys and at a Sun-Tethys-spacecraft, or phase, angle of 144 degrees. Image scale is 5 kilometers (3 miles) per pixel.

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