Astronomy:Ahuna Mons

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Short description: Largest mountain on Ceres
Ahuna Mons
Ahuna Mons imaged by the Dawn spacecraft.[lower-alpha 1]
Feature typeCryovolcanic dome
LocationCeres
Coordinates [ ⚑ ] : 10°28′S 315°48′E / 10.46°S 315.8°E / -10.46; 315.8
Peak4.1 km (2.5 mi) 13,500 ft (4,100 m)[1]
DiscovererDawn spacecraft team
2015
EponymAhuna, harvest festival of the Sümi Naga people.

Ahuna Mons[2] (/əˈhuːnə ˈmɒnz/) is the largest mountain on the dwarf planet and asteroid Ceres. It protrudes above the cratered terrain, is not an impact feature, and is the only mountain of its kind on Ceres. Bright streaks run top to bottom on its slopes which are thought to be salt, similar to the better known Cererian bright spots,[3] and likely resulted from cryovolcanic activity from Ceres's interior.[4] It is named after the traditional post-harvest festival Ahuna of the Sümi Naga people of India. In July 2018, NASA released a comparison of physical features, including Ahuna Mons, found on Ceres with similar ones present on Earth.[5]

Discovery

Significant amounts of sodium carbonate (represented by green and red coloring) have been detected on Ahuna Mons.

The mountain was discovered on images taken by the Dawn spacecraft in orbit around Ceres in 2015.[6] It is estimated to have an average height of about 4 km (2.5 mi; 13,000 ft) and a maximum height of about 5 km (3.1 mi; 16,000 ft) on its steepest side; it is about 20 km (12 mi; 66,000 ft) wide at the base.[1]

Origin

It has been proposed that Ahuna Mons formed as a cryovolcanic dome.[7][8] It is the closest cryovolcano to the Sun yet discovered.[9] It is roughly antipodal to the largest impact basin on Ceres, 280 km (170 mi) diameter Kerwan. Seismic energy from the Kerwan-forming impact may have been focused on the opposite side of Ceres, fracturing the outer layers of the area and facilitating the movement of high viscosity cryovolcanic magma (consisting of muddy water ice softened by its content of salts) that was then extruded onto the surface.[10][11] Crater counts suggest that formation of the mountain continued into the last several hundred million years, making this a relatively young geological feature.[8]

Ahuna Mons is associated with a positive mass anomaly, or mascon, centered about 32–36 km (20–22 mi) below it, not far above the crust-mantle boundary. This suggests it was formed by a plume of mud rising from the mantle.[10][11]

See also

  • List of geological features on Ceres
  • List of tallest mountains in the Solar System
  • Wright Mons – A likely cryovolcanic structure discovered on the dwarf planet Pluto
  • Yamor Mons – A similar mountain near Ceres's north pole

Notes

  1. ↑ North is down.

References

  1. ↑ 1.0 1.1 "PIA20348: Ahuna Mons Seen from LAMO". Jet Propulsion Lab. 7 March 2016. http://photojournal.jpl.nasa.gov/catalog/PIA20348. 
  2. ↑ Gazetteer of Planetary Nomenclature – Ahuna Mons
  3. ↑ Stone, Maddie (1 October 2015). "Ceres' Mysterious Bright Spots Aren't Made of Ice After All". Gizmodo. https://gizmodo.com/ceres-mysterious-bright-spots-arent-made-of-ice-after-a-1734112941. 
  4. ↑ Burnham, Robert (15 December 2015). "Deep freeze puts the squeeze on dwarf planet Ceres". Arizona State University. https://asunow.asu.edu/20151215-deep-freeze-puts-squeeze-dwarf-planet-ceres. 
  5. ↑ Landau, Elizabeth; McCartney, Gretchen (24 July 2018). "What Looks Like Ceres on Earth?". NASA. https://www.jpl.nasa.gov/news/news.php?feature=7196. 
  6. ↑ Mack, Eric (17 June 2015). "NASA spies 3-mile-tall 'pyramid,' more bright spots on Ceres". CNET. Red Ventures. http://www.cnet.com/uk/news/3-mile-tall-pyramid-more-bright-spots-spied-on-ceres/. 
  7. ↑ Skibba, Ramin A. (1 September 2016). "Giant ice volcano spotted on dwarf planet Ceres". Nature. doi:10.1038/nature.2016.20526. 
  8. ↑ 8.0 8.1 Ruesch, Ottaviano (2 September 2016). "Cryovolcanism on Ceres". Science 353 (6303). doi:10.1126/science.aaf4286. PMID 27701087. Bibcode: 2016Sci...353.4286R. https://zenodo.org/records/1231277/files/article.pdf. 
  9. ↑ "The Mystery of Ahuna Mons, The Lonely Ice Volcano". States News Service. Cengage. 23 January 2017. http://go.galegroup.com/ps/i.do?p=AONE&sw=w&v=2.1&id=GALE%7CA480142011&it=r&asid=65778ea5e8a6f047a74e50ad58b05897. 
  10. ↑ 10.0 10.1 Choi, Charles Q. (10 June 2019). "A Weird Mud Plume May Have Built the Highest Peak on Dwarf Planet Ceres". Space.com. https://www.space.com/ceres-highest-mountain-mud-plume.html. 
  11. ↑ 11.0 11.1 Ruesch, Ottaviano (2019). "Slurry extrusion on Ceres from a convective mud-bearing mantle". Nature Geoscience 12 (7): 505–509. doi:10.1038/s41561-019-0378-7. Bibcode: 2019NatGe..12..505R. 



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