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Scientists saw the Tethys Pac-Man in data obtained on Sept. 14, 2011, where daytime temperatures inside the mouth of Pac-Man were seen to be cooler than their surroundings by 29 degrees Fahrenheit (15 kelvins). The warmest temperature recorded was a chilly minus 300 degrees Fahrenheit (90 kelvins). The Mimas Pac-Man was seen in data from Feb. 13, 2010. (For more information, see PIA12867.) The high temperature at Tethys is actually slightly cooler than the warmest temperature at Mimas (about minus 290 degrees Fahrenheit or 95 kelvins). One version of the image pegs white to be the hottest temperatures on both moons -- minus 290 degrees Fahrenheit (95 kelvins) on Mimas and minus 300 degrees Fahrenheit (90 kelvins) on Tethys. Another version shows the minus 290 degrees Fahrenheit (95 kelvins) as white on both moons, revealing a subtler temperature variation on Tethys. Unannotated images of the two color schemes are also available.
At Tethys, unlike Mimas, the Pac-Man pattern can also be seen subtly in visible-light images of the surface, as a dark lens-shaped region. This brightness variation was first noticed in an image from NASA's Voyager spacecraft in 1980. (A good view of this region can be seen in PIA01392.)
Scientists theorize that the Pac-Man thermal shape on the Saturnian moons occurs because high-energy electrons bombard low latitudes on the side of the moon that faces forward as it orbits around Saturn, turning a fluffy surface into hard-packed ice. As a result, the altered surface does not heat as rapidly in the sunshine or cool down as quickly at night as the rest of the surface, similar to how a boardwalk at the beach feels cooler during the day but warmer at night than the nearby sand. Finding another PacMan on Tethys confirms that high-energy electrons can dramatically alter the surface of an icy moon. Also, because the altered region on Tethys, unlike on Mimas, is also bombarded by icy particles from Enceladus' plumes, it implies the surface alteration is occurring more quickly than its recoating by plume particles.
The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. NASA's Jet Propulsion Laboratory, Pasadena, Calif., 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 was designed, developed and assembled at JPL. The composite infrared spectrometer team is based at NASA's Goddard Space Flight Center in Greenbelt, Md., where the instrument was built.