Saturn’s Moon ‘Pan’ Features Bizarre 3-D Shape As Cassini Spacecraft Captures Closest Shot

By  //  March 16, 2017

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These stereo views, or anaglyphs, highlight the unusual, quirky shape of Saturn’s moon Pan. They appear three-dimensional when viewed through red-blue glasses with the red lens on the left. (NASA Image)

(NASA) – These stereo views, or anaglyphs, highlight the unusual, quirky shape of Saturn’s moon Pan. They appear three-dimensional when viewed through red-blue glasses with the red lens on the left.

The views show the northern and southern hemispheres of Pan, at left and right, respectively. They have been rotated to maximize the stereo effect.

Standard (non-stereo) versions of these views are presented in PIA21436.

Pan has an average diameter of 17 miles (28 kilometers). The moon orbits within the Encke Gap in Saturn’s A ring. See PIA09868 and PIA11529 for more distant context views of Pan.

Both of these views look toward Pan’s trailing side, which is the side opposite the moon’s direction of motion as it orbits Saturn.

These views were acquired by the Cassini narrow-angle camera on March 7, 2017, at distances of approximately 16,000 miles or 25,000 kilometers (left view) and 21,000 miles or 34,000 kilometers (right view).

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Image scale in the original images is about 500 feet (150 meters) per pixel (left view) and about 650 feet (200 meters) per pixel (right view). The images have been magnified by a factor of two from their original size.

For other 3-D images from the Cassini mission, see http://go.nasa.gov/2mudxQA.

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 mission for NASA’s Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colo.

PAN REVEALED

These two images from NASA’s Cassini spacecraft show how the spacecraft’s perspective changed as it passed within 15,300 miles (24,600 kilometers) of Saturn’s moon Pan on March 7, 2017. This was Cassini’s closest-ever encounter with Pan, improving the level of detail seen on the little moon by a factor of eight over previous observations.

The views show the northern and southern hemispheres of Pan, at left and right, respectively. Both views look toward Pan’s trailing side, which is the side opposite the moon’s direction of motion as it orbits Saturn.

Cassini imaging scientists think that Pan formed within Saturn’s rings, with ring material accreting onto it and forming the rounded shape of its central mass, when the outer part of the ring system was quite young and the ring system was vertically thicker. Thus, Pan probably has a core of icy material that is denser than the softer mantle around it.

The distinctive, thin ridge around Pan’s equator is thought to have come after the moon formed and had cleared the gap in the rings in which it resides today. At that point the ring was as thin as it is today, yet there was still ring material accreting onto Pan. However, at the tail end of the process, that material was raining down on the moon solely in (or close to) its equatorial region.

Thus, the infalling material formed a tall, narrow ridge of material. On a larger, more massive body, this ridge would not be so tall (relative to the body) because gravity would cause it to flatten out.

But Pan’s gravity is so feeble that the ring material simply settles onto Pan and builds up. Other dynamical forces keep the ridge from growing indefinitely.

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These views are also presented in stereo (3-D) in PIA21435. The images are presented here at their original size.

The views were acquired by the Cassini narrow-angle camera at distances of 15,275 miles or 24,583 kilometers (left view) and 23,199 miles or 37,335 kilometers (right view). Image scale is 482 feet or 147 meters per pixel (left view) and about 735 feet or 224 meters per pixel (right view).

See PIA09868 and PIA11529 for more distant context views of Pan.

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 mission for NASA’s Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colo.


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