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The term "Ananke moon" refers to a group of small moons that orbit Jupiter in distant and irregular orbits. These moons are characterized by their retrograde motion, which means they orbit Jupiter in the opposite direction of the planet's rotation. They are part of a larger group of irregular moons that orbit Jupiter, but the Ananke group specifically shares similar orbital characteristics.
Here are some key characteristics of Ananke moons:
Retrograde Orbits: Ananke moons have retrograde orbits, which is relatively unusual for the moons of Jupiter. Most of Jupiter's larger moons have prograde orbits, meaning they orbit in the same direction as the planet's rotation.
Small Size: These moons are relatively small compared to Jupiter's larger Galilean moons like Io, Europa, Ganymede, and Callisto. They are irregularly shaped and are believed to be composed of a mixture of rock and ice.
Distant Orbits: Ananke moons have distant and often inclined orbits. They are located far from Jupiter compared to its larger moons and have significant inclinations relative to Jupiter's equator.
Naming: Many of the Ananke moons are named after characters associated with the mythological concept of "Ananke," which represents necessity or inevitability in Greek mythology. The names draw from figures in various mythologies, not just Greek.
Some examples of Ananke moons, in addition to those previously mentioned, include Euanthe, Orthosie, and Harpalyke.
These small irregular moons are thought to be remnants from the early solar system and are believed to have been captured by Jupiter's gravitational influence. They are interesting objects for study because they can provide insights into the formation and history of the Jovian system. However, they are relatively less explored compared to Jupiter's larger and more prominent moons.
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