Hartwig (Martian crater)
Map of Argyre quadrangle with major features labeled. Galle crater looks like a smile.
|Eponym||Ernst Hartwig, a German astronomer (1851-1923)|
Hartwig Crater is a crater in the Argyre quadrangle of Mars, located at 39° south latitude and 16° west longitude. It is 105 km in diameter and was named after Ernst Hartwig, a German astronomer (1851–1923).
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. The peak is caused by a rebound of the crater floor following the impact. If one measures the diameter of a crater, the original depth can be estimated with various ratios. Because of this relationship, researchers have found that many Martian craters contain a great deal of material; much of it is believed to be ice deposited when the climate was different.
West side of Hartwig Crater, as seen by CTX camera (on Mars Reconnaissance Orbiter). The smaller crater is on the rim of Hartwig Crater.
- "Gazetteer of Planetary Nomenclature | Hartwig". usgs.gov. International Astronomical Union. Retrieved 4 March 2015.
- Hugh H. Kieffer (1992). Mars. University of Arizona Press. ISBN 978-0-8165-1257-7. Retrieved 7 March 2011.
- Garvin, J., et al. 2002. Global geometric properities of martian impact craters. Lunar Planet Sci. 33. Abstract @1255.
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