Denning (Martian crater)

From Infogalactic: the planetary knowledge core
Jump to: navigation, search
Denning Crater
200px
Quadrangle map of Sinus Sabaeus labeled with major features. Colored rectangles represent image footprints of Mars Global Surveyor.
Planet Mars
Coordinates Lua error in Module:Coordinates at line 668: callParserFunction: function "#coordinates" was not found.
Diameter 165 km
Eponym William F. Denning, a British astronomer (1848-1931)

Denning Crater is a crater in the Sinus Sabaeus quadrangle of Mars at 17.7° south latitude and 326.6° west longitude. It is about 165 km in diameter and was named after William F. Denning, a British astronomer (1848–1931).[1]

Craters

Recent small crater on floor of Dennin Crater, as seen by HiRISE. Arrow shows group of secondary craters from ejecta falling down.

When a comet or asteroid collides at a high rate of speed interplanetary with the surface of Mars it creates a primary impact crater. The primary impact may also eject significant numbers of rocks which eventually fall back to make secondary craters.[2] The secondary craters may be in clusters. All of the craters in the cluster would appear to be equally eroded; hence they would all seem to be of the same age. If these secondary craters formed from a single, large, nearby impact, then they would have formed at roughly the same instant in time. The image below of Dennin Crater shows a cluster of secondary craters.

References

  1. "Planetary Names: Welcome". Planetarynames.wr.usgs.gov. Retrieved 2011-08-07.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  2. "HiRISE | Science Themes: Impact Processes". Hirise.lpl.arizona.edu. Retrieved 2011-08-07.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>