Onon (crater)

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Onon Crater.JPG
Onon Crater, as seen by HiRISE. Scale bar is 500 meters long.
Coordinates16°18′N 257°36′W / 16.3°N 257.6°W / 16.3; -257.6Coordinates: 16°18′N 257°36′W / 16.3°N 257.6°W / 16.3; -257.6
Diameter3.5 km
EponymTown in Mongolia

Onon is an impact crater on Mars, located in the Amenthes quadrangle at 16.3° N and 257.6° W. It measures 3.5 kilometer in diameter and was named after Onon, a town in Mongolia.[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] Sometimes craters expose layers that were buried. Rocks from deep underground are tossed onto the surface. Hence, craters can show us what lies deep under the surface.

See also[edit]


  1. ^ "Gazetteer of Planetary Nomenclature | Onon". usgs.gov. International Astronomical Union. Retrieved 4 March 2015.
  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.