Onon (crater)
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.
- CTX camera (on Mars Reconnaissance Orbiter) image of Onon Crater and area around it. Arrow indicates Onon Crater.
Onon crater, as seen by HiRISE. Scale bar is 500 meters long. | |
Planet | Mars |
---|---|
Coordinates | 16.3°N 257.6°W |
Quadrangle | Amenthes quadrangle |
Diameter | 3.5 km |
Eponym | Town in Mongolia |
See also
References
- "Gazetteer of Planetary Nomenclature | Onon". usgs.gov. International Astronomical Union. Retrieved 4 March 2015.
- http://www.lpi.usra.edu/publications/slidesets/stones/
- Hugh H. Kieffer (1992). Mars. University of Arizona Press. ISBN 978-0-8165-1257-7. Retrieved 7 March 2011.
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