 El is the partly visible crater in the upper right. | |
| Feature type | Crater |
|---|---|
| Coordinates | 1°00′N151°24′W / 1.0°N 151.4°W Coordinates: 1°00′N151°24′W / 1.0°N 151.4°W |
| Diameter | 54.3 km |
| Eponym | El |
El is a crater on Ganymede. It has a small "pit" in its center. Craters with such a "central pit" are common across Ganymede and are especially intriguing since they may reveal secrets about the structure of the satellite's shallow subsurface. [1]
The Galilean moons are the four largest moons of Jupiter—Io, Europa, Ganymede, and Callisto. They were first seen by Galileo Galilei in December 1609 or January 1610, and recognized by him as satellites of Jupiter in March 1610. They were the first objects found to orbit a planet other than the Earth.
Callisto, or Jupiter IV, is the second-largest moon of Jupiter, after Ganymede. It is the third-largest moon in the Solar System after Ganymede and Saturn's largest moon Titan, and the largest object in the Solar System that may not be properly differentiated. Callisto was discovered in 1610 by Galileo Galilei. At 4821 km in diameter, Callisto has about 99% the diameter of the planet Mercury but only about a third of its mass. It is the fourth Galilean moon of Jupiter by distance, with an orbital radius of about 1883000 km. It is not in an orbital resonance like the three other Galilean satellites—Io, Europa, and Ganymede—and is thus not appreciably tidally heated. Callisto's rotation is tidally locked to its orbit around Jupiter, so that the same hemisphere always faces inward. Because of this, there is a sub-Jovian point on Callisto's surface, from which Jupiter would appear to hang directly overhead. It is less affected by Jupiter's magnetosphere than the other inner satellites because of its more remote orbit, located just outside Jupiter's main radiation belt.
Ganymede, a satellite of Jupiter, is the largest and most massive of the Solar System's moons. The ninth-largest object of the Solar System, it is the largest without a substantial atmosphere. It has a diameter of 5,268 km (3,273 mi), making it 26 percent larger than the planet Mercury by volume, although it is only 45 percent as massive. Possessing a metallic core, it has the lowest moment of inertia factor of any solid body in the Solar System and is the only moon known to have a magnetic field. Outward from Jupiter, it is the seventh satellite and the third of the Galilean moons, the first group of objects discovered orbiting another planet. Ganymede orbits Jupiter in roughly seven days and is in a 1:2:4 orbital resonance with the moons Europa and Io, respectively.
EL, El or el may refer to:
This is a directory of lists of geological features on planets excepting Earth, moons and asteroids ordered by increasing distance from the Sun.
Neith crater is a crater on Jupiter's moon Ganymede, the largest moon in the solar system.
Khensu crater is a crater on Jupiter's moon Ganymede. It is a dark-floored crater with a bright ejecta blanket located in the grooved terrain region Uruk Sulcus. The dark component may be residual material from the impactor that formed the crater. Another possibility is that the impactor may have punched through the bright surface to reveal a dark layer beneath.
In planetary nomenclature, a fossa is a long, narrow depression (trough) on the surface of an extraterrestrial body, such as a planet or moon. The term, which means "ditch" or "trench" in Latin, is not a geological term as such but a descriptor term used by the United States Geological Survey (USGS) and the International Astronomical Union (IAU) for topographic features whose geology or geomorphology is uncertain due to lack of data or knowledge of the exact processes that formed them. Fossae are believed to be the result of a number of geological processes, such as faulting or subsidence. Many fossae on Mars are probably graben.
A crater chain is a line of craters along the surface of an astronomical body. The descriptor term for crater chains is catena, plural catenae, as specified by the International Astronomical Union's rules on planetary nomenclature.
USS Ganymede (AK-104) was an Crater-class cargo ship commissioned by the US Navy for service in World War II. She was responsible for delivering troops, goods and equipment to locations in the war zone. Named after the largest of the moons of Jupiter, Ganymede was the only ship of the Navy to bear this name.
Enki Catena is a crater chain on Ganymede measuring 161.3 kilometres (100.2 mi) long.
Gula is a crater on Ganymede. It is a fresh crater with a distinctive central peak. It is about 40 km in diameter.
Achelous is a relatively fresh crater on Ganymede adjacent to the similarly sized Gula. It has an outer lobate ejecta deposit extending about a crater radius from the rim.
Galileo Regio is a large, dark surface feature on Jupiter's moon Ganymede.
Memphis Facula is a palimpsest, or "ghost crater", on Ganymede, the largest of the Jovian satellites.
Gibran is a crater on Mercury and is in the east of the Shakespeare quadrangle. It was named after Lebanese-American poet Khalil Gibran in 2009. It has a diameter of 102 km. Gibran is located east of the rayed crater of Degas and nearby Damer.
A palimpsest, in planetary astronomy, is an ancient crater that has been degraded over time. They may also be referred to as "ghost craters", "degraded craters", "buried craters", or "pathological craters". Palimpsests have been identified on Mercury, the Earth, the Moon, Mars, Ganymede, Callisto, and possibly even Titan. On Mars, these features are morphologically described as craters that are "flat-floored, rimless, extremely shallow, without central peaks, and would probably represent what remains after erosion."
Nadine G. Barlow (1958-2020) was an American planetary scientist. She was a professor in the Department of Physics and Astronomy at Northern Arizona University (NAU). She became Associate Chair of the NAU Department of Physics and Astronomy in Fall 2010. She was also the director of the Northern Arizona University/NASA Space Grant Program and an associate director of the Arizona Space Grant Consortium.
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