Porter (Martian crater)

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Porter Crater.JPG
Porter crater rim, as seen with Mars Global Surveyor.
Planet Mars
Region Aonia Terra
Coordinates 50°48′S 113°54′W / 50.8°S 113.9°W / -50.8; -113.9Coordinates: 50°48′S 113°54′W / 50.8°S 113.9°W / -50.8; -113.9
Diameter 105 km
Eponym Russell W. Porter

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 US 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]

See also[edit]


  1. ^ http://www.flag.wr.usgs.gov
  2. ^ http://www.lpi.usra.edu/publications/slidesets/stones/
  3. ^ Hugh H. Kieffer (1992). Mars. University of Arizona Press. ISBN 978-0-8165-1257-7. Retrieved 7 March 2011.