![]() Evander as viewed by the Cassini-Huygens orbiter | |
Feature type | Multi-ring impact basin |
---|---|
Location | Dione |
Coordinates | 57°00′S145°00′W / 57.00°S 145.00°W [1] |
Diameter | 350 km |
Discoverer | Cassini-Huygens |
Eponym | Evander of Pallene, Roman hero |
Evander is the largest impact basin on Saturn's moon Dione. It is named after the mythological Roman hero Evander of Pallene, son of Hermes. The name Evander was officially approved by the International Astronomical Union (IAU) on 17 March 2008. [1]
Evander is a large multi-ring impact basin located in Dione's southern hemisphere. Evander is estimated to be relatively young; estimates range from 2 billion years down to as recently as under 1 billion years old. Surrounding Evander is an extensive ejecta blanket, and a significant portion of Dione's small (< 20 km) craters may be the result of debris blasted out from the impact event that created Evander. Evander is a significantly relaxed crater, with its topographic profile having been "muted" since its formation and resulting in a shallower impact basin than would otherwise be expected. That Evander is relaxed indicates that Dione was thermally active until recently, with a surface heat flux of over 60 mW/m2. [2] [3]
Rhea is the second-largest moon of Saturn and the ninth-largest moon in the Solar System, with a surface area that is comparable to the area of Australia. It is the smallest body in the Solar System for which precise measurements have confirmed a shape consistent with hydrostatic equilibrium. It was discovered in 1672 by Giovanni Domenico Cassini.
Helene is a moon of Saturn. It was discovered by Pierre Laques and Jean Lecacheux in 1980 from ground-based observations at Pic du Midi Observatory, and was designated S/1980 S 6. In 1988 it was officially named after Helen of Troy, who was the granddaughter of Cronus (Saturn) in Greek mythology. Helene is also designated Saturn XII (12), which it was given in 1982, and Dione B, because it is co-orbital with Dione and located in its leading Lagrangian point (L4). It is one of four known trojan moons.
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Occator is an impact crater located on Ceres, the largest object in the main asteroid belt that lies between the orbits of Mars and Jupiter, that contains "Spot 5", the brightest of the bright spots observed by the Dawn spacecraft. It was known as "Region A" in ground-based images taken by the W. M. Keck Observatory on Mauna Kea.
Burney, sometimes referred to as the Burney basin, is the second-largest known impact basin on the dwarf planet Pluto. With a diameter of over 290 kilometers and possibly up to 350 kilometers, it is the second-largest known impact basin on Pluto, after the Sputnik Planitia basin. Burney is the only impact basin with visible multiple rings known on Pluto and is thus classified as a multi-ringed impact basin, though its rings have been heavily eroded due to Burney's age.
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Evander Crater at the IAU Gazetteer of Planetary Nomenclature