Hartwig (Martian crater)

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Hartwig Crater
Argyre Map.JPG
Map of Argyre quadrangle with major features labeled. Galle crater looks like a smile.
Planet Mars
Coordinates 39°S 16°W / 39°S 16°W / -39; -16Coordinates: 39°S 16°W / 39°S 16°W / -39; -16
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]

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]

See also[edit]

References[edit]

  1. ^ http://planetarynames.wr.usgs.gov
  2. ^ http://www.lpi.usra.edu/publications/slidesets/stones/
  3. ^ Hugh H. Kieffer (1992). Mars. University of Arizona Press. ISBN 978-0-8165-1257-7. Retrieved 7 March 2011. 
  4. ^ Garvin, J., et al. 2002. Global geometric properities of martian impact craters. Lunar Planet Sci. 33. Abstract @1255.