Astronomy:Porter (Martian crater)

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Porter
Porter Crater.JPG
Porter crater rim, as seen with Mars Global Surveyor.
PlanetMars
RegionAonia Terra
CoordinatesCoordinates: 50°48′S 113°54′W / 50.8°S 113.9°W / -50.8; -113.9
Diameter105 km

Porter is a large-scale impact crater in the Thaumasia quadrangle on the planet Mars, situated in Aonia Terra at 50.8° south and 113.9º west. The impact caused a bowl 105 kilometres (65 mi) across. The name was chosen in 1973 by the International Astronomical Union in honour of the United States astronomer and explorer, Russell W. Porter (1871-1949).[1]

Impact craters generally have a rim with ejecta around them, in contrast volcanic craters usually do not have a rim or ejecta deposits. As craters get larger (greater than 10 km in diameter) they usually have a central peak.[2] The peak is caused by a rebound of the crater floor following the impact.[3]

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