 | |
| Feature type | Cryovolcanic dome |
|---|---|
| Location | Ceres |
| Coordinates | 10°28′S315°48′E / 10.46°S 315.8°E /-10.46; 315.8 |
| Peak | 4.1 km (2.5 mi) 13,500 ft (4,100 m)[1] |
| Discoverer | Dawn spacecraft team 2015 |
| Eponym | Ahuna, harvest festival of theSümi Naga people. |
Ahuna Mons[2] (/əˈhuːnəˈmɒnz/) is the largest mountain on the dwarf planet and asteroidCeres. 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 knownCererian bright spots,[3] and likely resulted fromcryovolcanic activity from Ceres's interior.[4] It is named after the traditional post-harvest festivalAhuna of theSümi 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]
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The mountain was discovered on images taken by theDawn 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]
It has been proposed that Ahuna Mons formed as acryovolcanic 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) diameterKerwan.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 cryovolcanicmagma (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, ormascon, 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]
