Image Credit: NASA/JPL/ASU

Context image credit: NASA/JPL/MOLA
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Detailed information on this image is available at the THEMIS Data Releases website.

 

Please see the THEMIS Data Citation Note for details on crediting THEMIS images.

 

Today's THEMIS image contains the northern rim of a 175 km diameter crater called Terby. This crater is named after Francois J. Terby, a Belgian astronomer (1846-1911). Terby crater is located in Tyrrhena Terra a region of the cratered southern hemisphere. Gullies are clearly visible along the slopes in the upper portion of this image. These gullied slopes also appear mantled upon closer examination. This mantled unit contains lobes near its lower margins suggesting apparent downslope movement. However, the craters on this material do not show any signs of being distorted by downslope movement. It is possible that the craters formed after any movement occurred or alternatively that in fact no movement has occurred. There are also some larger deeper channels visible near the right center of the image. These channels also appear to be covered with the mantling material in places.