This image from NASA's Cassini spacecraft shows Saturn's moon Tethys partially occulting the moon Dione. The difference in the surface brightness of the two moons is immediately apparent.

This image shows Saturn's moon Tethys partially occulting the moon Dione. The difference in the surface brightness of the two moons is immediately apparent.

The diameter of Tethys is 1,071 kilometers (665 miles), while Dione is 1,126 kilometers (700 miles) across.

This still image was acquired on Sept. 16, 2005, at a distance of 2.1 million kilometers (1.3 million miles) from Dione and 2.7 million kilometers (1.7 million miles) from Tethys. Resolution in the original images was 13 kilometers (8 miles) per pixel on Dione and 16 kilometers (10 miles) per pixel on Tethys. The still image was magnified by a factor of two to aid visibility of surface features.

A brief movie of is also available (see PIA07620).

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