Hartwig (Martian crater)
 Topographic map of Hartwig Crater | |
| Planet | Mars |
|---|---|
| Coordinates | 39°S 16°W / 39°S 16°WCoordinates: 39°S 16°W / 39°S 16°W |
| Diameter | 105 km |
| 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).[1]
The crater is located under a crater diameter southwest of Vogel, other nearby prominent and named craters include the larger Lohse to the south, Arkhangelsky to the west-southwest, the tiny Nybyen under a crater diameter north and further north are Mena and Shatskiy.
Topo map showing location of Hartwig Crater and other nearby craters
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] 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.[4]
West side of Hartwig Crater, as seen by CTX camera (on Mars Reconnaissance Orbiter). The smaller crater is on the rim of Hartwig Crater.
Tongue-shaped glaciers from previous image of Hartwig Crater, as seen by CTX camera (on Mars Reconnaissance Orbiter). Arrows indicate the tongue-shaped glaciers.
Middle section of Hartwig Crater, as seen by CTX camera (on Mars Reconnaissance Orbiter).- Channels on northern wall of Hartwig, as seen by CTX camera (on Mars Reconnaissance Orbiter). Note: this is an enlargement of the previous photo of the middle section of Hartwig Crater.
Hartwig Crater Floor, as seen by HiRISE. The scale bar is 500 meters long.
See also
References
- ↑ "Gazetteer of Planetary Nomenclature | Hartwig". 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.
- ↑ Garvin, J., et al. 2002. Global geometric properities of martian impact craters. Lunar Planet Sci. 33. Abstract @1255.