Hartwig (Martian crater)

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]

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  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]

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  West side of Hartwig Crater, as seen by CTX camera (on Mars Reconnaissance Orbiter). The smaller crater is on the rim of Hartwig Crater.
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  Tongue-shaped glaciers from previous image of Hartwig Crater, as seen by CTX camera (on Mars Reconnaissance Orbiter). Arrows indicate the tongue-shaped glaciers.
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  Middle section of Hartwig Crater, as seen by CTX camera (on Mars Reconnaissance Orbiter).
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  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.
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  Hartwig Crater Floor, as seen by HiRISE. The scale bar is 500 meters long.

See also

References