The mountain imaged by the Dawn spacecraft. North is down.
|Peak||about 4 km (2.5 mi or 13,500 ft) high|
|Discoverer||Dawn spacecraft team|
|Eponym||Ahuna, harvest festival of the Sumi Naga from India.|
Ahuna Mons / / 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; these streaks are thought to be salt, similar to the better known Cererian bright spots, and likely resulted from cryovolcanic activity from Ceres's interior. It is named after the traditional post-harvest festival Ahuna of the Sumi 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.
The mountain was discovered on images taken by the Dawn spacecraft in orbit around Ceres in 2015. 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.
It has been proposed that Ahuna Mons formed as a cryovolcanic dome. It is the closest cryovolcano to the Sun yet discovered. 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. Crater counts suggest that formation of the mountain continued into the last several hundred million years, making this a relatively young geological feature.
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.
Ceres viewed by Dawn. The north face of Ahuna Mons projects above the center of the limb. North is down.
Context view of the mountain surrounded by lightly cratered terrain. Bright spots on Ceres can be seen at 11:00. North is up.
|Wikimedia Commons has media related to Ahuna Mons.|
- "PIA20348: Ahuna Mons Seen from LAMO". Jet Propulsion Lab. 7 March 2016. Retrieved 14 April 2016.
- Gazetteer of Planetary Nomenclature – Ahuna Mons
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- Choi, Charles Q. (10 June 2019). "A Weird Mud Plume May Have Built the Highest Peak on Dwarf Planet Ceres". Space.com. Retrieved 10 June 2019.
- Ruesch, O.; Genova, A.; Neumann, W.; Quick, L. C.; Castillo-Rogez, J. C.; Raymond, C. A.; Russell, C. T.; Zuber, M. T. (2019). "Slurry extrusion on Ceres from a convective mud-bearing mantle". Nature Geoscience. 12 (7): 505–509. Bibcode:2019NatGe..12..505R. doi:10.1038/s41561-019-0378-7.
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- Brown, Dwayne; Wendel, JoAnna; McCartney, Gretchen (1 November 2018). "NASA's Dawn Mission to Asteroid Belt Comes to End". NASA. Retrieved 2 November 2018.
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