Janssen (Martian crater)

Janssen Crater
Location of Janssen Crater
Planet Mars
Region Arabia quadrangle
Coordinates 2°42′N 38°30′E / 2.7°N 38.5°E / 2.7; 38.5Coordinates: 2°42′N 38°30′E / 2.7°N 38.5°E / 2.7; 38.5
Diameter 158 km
Eponym Pierre Janssen
Eastern edge of Janssen Crater, as seen by CTX camera (on Mars Reconnaissance Orbiter).
Layers and dark slope streaks in northeastern edge of Janssen Crater, as seen by CTX camera (on Mars Reconnaissance Orbiter). Note: this is an enlargement of the previous image of Janssen Crater.

Janssen Crater is an impact crater in the Arabia quadrangle on Mars at 2.7° N and 322.5° W. and is 158.0 km in diameter, it is also in the north of Terra Sabaea. Its name was approved in 1973, and it was named after Pierre Janssen.[1] Some close up images of the crater reveal layers in a floor deposit. A picture below show these layers, as well as dark slope streaks. The darker the streak, the younger it is. The layers on the floor of Janssen may have been formed on the bottom of lakes.[2][3][4]

Nearby prominent and named craters include Teisserenc de Bort crater in the east, Tuscaloosa to the west and the large Tikhonravov for the north. Some tens of kilometers to the west is a valley known as Naktong Vallis.

See also

References

  1. ↑ "Gazetteer of Planetary Nomenclature | Janssen". usgs.gov. International Astronomical Union. Retrieved 5 March 2015.
  2. ↑ Cabrol, N. and E. Grin. 2001. The Evolution of Lacustrine Environments on Mars: Is Mars Only Hydrologically Dormant? Icarus: 149, 291-328.
  3. ↑ Fassett, C. and J. Head. 2008. Open-basin lakes on Mars: Distribution and implications for Noachian surface and subsurface hydrology. Icarus: 198, 37-56.
  4. ↑ Fassett, C. and J. Head. 2008. Open-basin lakes on Mars: Implications of valley network lakes for the nature of Noachian hydrology.


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