Hecates Tholus

Coordinates: 32°07′N 150°14′E / 32.12°N 150.24°E / 32.12; 150.24
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Hecates Tholus
2001 Mars Odyssey THEMIS daytime infrared image mosaic
Coordinates32°07′N 150°14′E / 32.12°N 150.24°E / 32.12; 150.24
EponymHecate

Hecates Tholus is a Martian volcano, notable for results from the European Space Agency's Mars Express mission which indicate a major eruption took place 350 million years ago. The eruption created a caldera 10 km in diameter. It has been suggested that glacial deposits later partly filled the caldera and an adjacent depression. Crater counts indicate this happened as recently as 5 to 20 million years ago. However climate models show that ice is not stable at Hecates Tholus today, pointing to climate change since the glaciers were active. It has been shown that the age of the glaciers correspond to a period of increased obliquity of Mars' rotational axis.[1]

The volcano is at location 32.12°N 150.24°E, in the volcanic province Elysium, and has a diameter of 182 km. It is the northernmost of the Elysium volcanoes; the others are Elysium Mons and Albor Tholus. Hecates Tholus is in the Cebrenia quadrangle.

Origin of name

In planetary nomenclature, a "tholus" is a "small domical mountain or hill". Hecates is named after Hecate, the goddess of the ghost-world, nightly events, and sorcery.[2]

Gallery

  • Hecates Tholus topography.
    Hecates Tholus topography.
  • Hecates Tholus ridges, as seen by HiRISE. Ridges are to the west-northwest of Hecates Tholus. It has been proposed that this region was affected by a volcanic eruption that occurred under a 200 meter-thick ice sheet.[3]
    Hecates Tholus ridges, as seen by HiRISE. Ridges are to the west-northwest of Hecates Tholus. It has been proposed that this region was affected by a volcanic eruption that occurred under a 200 meter-thick ice sheet.[3]
  • Mars Global Surveyor Mars Orbiter Camera image.
    Mars Global Surveyor Mars Orbiter Camera image.

See also

References

  1. ^ Huber, Ernst; Van Gasselt, S; Ivanov, B; Werner, S; Head, JW; Neukum, G; Jaumann, R; Greeley, R; Mitchell, KL; Muller, Peter; HRSC Co-Investigator Team (17 March 2005). "Discovery of a flank caldera and very young glacial activity at Hecates Tholus". Nature. 434 (7031): 356–361. Bibcode:2005Natur.434..356H. doi:10.1038/nature03423. PMID 15772654. {{cite journal}}: Unknown parameter |displayauthors= ignored (|display-authors= suggested) (help)
  2. ^ Blunck, J. 1982. Mars and its Satellites. Exposition Press. Smithtown, N.Y.
  3. ^ Mougins-Mark, P., L. Wilson. 2016. Possible sub-glacial eruptions in the Galaxias Quadrangle, Mars. 267, 68-85.

External links

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