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Memphis Facula

From Wikipedia, the free encyclopedia

Memphis Facula
A Voyager 2 image of Memphis Facula on Ganymede (white patch on lower right). The smaller, darker, more rugged Nidaba, to its upper right, is considered a crater.[1]
Feature typeFacula
Coordinates14°06′N 131°54′W / 14.1°N 131.9°W / 14.1; -131.9[2]
Diameter360 km (220 mi)
EponymMemphis, Egypt

Memphis Facula /ˈmɛmfɪsˈfækjʊlə/ is a palimpsest, or "ghost crater", on Ganymede, the largest of the Jovian satellites.

About 360 km across,[2] it is situated in the southwestern part of Galileo Regio, a huge almost circular dark region in Ganymede's northern hemisphere. Although almost level today, it is a relic of a massive impact and once was a deep impact crater whose walls have slumped and its floor has risen isostatically, smoothing out the remaining topography with slush.

The morphology of the larger palimpsests like Memphis Facula suggests that Ganymede's icy crust at the time of impact was about 10 km thick and was penetrated by the impact, allowing the slush and fluid beneath to fill and level out the crater.[3]

See also

References

  1. ^ "Ganymede: Nidaba". Gazetteer of Planetary Nomenclature. USGS Astrogeology. Retrieved 2014-06-21.
  2. ^ a b "Ganymede: Memphis Facula". Gazetteer of Planetary Nomenclature. USGS Astrogeology. Retrieved 2012-03-12.
  3. ^ Harland, D. M. (1 October 2000). Jupiter Odyssey: The Story of NASA's Galileo Mission. Springer. p. 136. ISBN 978-1-85233-301-0. OCLC 44461919.
This page was last edited on 27 April 2024, at 10:05
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