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 |
| 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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