Ahuna Mons / / is the largest mountain on the dwarf planet and asteroid Ceres. It protrudes above otherwise smooth terrain, it is not an impact feature, and it appears to be 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.
The mountain imaged by the Dawn spacecraft. North is down.
|Peak||about 4 km (2 mi or 13,000 ft) high|
|Discoverer||Dawn spacecraft team
|Eponym||Ahuna, harvest festival of the Sumi Naga from India.|
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 in the Solar System. 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.
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.|
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- Gazetteer of Planetary Nomenclature – Ahuna Mons
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