Abstract
The gas and ice giant worlds each have an extensive family of satellites, but with one exception, each has only a handful of large, complex moons (Fig. 5.1). Jupiter has its four Galilean satellites, Uranus has its five major moons (Ariel, Umbriel, Titania, Oberon, Miranda, and Ariel) and Neptune has its trio of moons: Proteus, Triton, and Nereid. In each case, the rest of the moons range from a few to less than 180 km across. The exception is Saturn. Saturn’s retinue includes so many major moons that educators have come up with a mnemonic to remember them: MET DR THIP (for Mimas, Enceladus, Tethys, Dione, Rhea, Titan, Hyperion, Iapetus, and Phoebe).
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Notes
- 1.
Features on Callisto are named after gods and heroes of Nordic mythology, along with their homes, such as Valhalla.
- 2.
John Herschel went on to name a total of seven moons of Saturn and four of Uranus.
- 3.
By this time Titan was already known, having been discovered by Christian Huygens in 1655.
- 4.
The G ring’s inner edge is 15,000 km inside the orbit of Mimas, but its amorphous outer edge varies by some 9000 km.
- 5.
Icarus, March 2014.
- 6.
Dombard et al., Abstract P31D-01 presented at 2010 Fall Mtg., AGU.
- 7.
For a good summary, see “Icy rings found around tiny space rock,” Science News, May 3, 2014, p. 10.
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Carroll, M. (2019). The Silent Ice Moons: Callisto, Tethys, Dione, Iapetus, and Smaller Moons of the Outer Giants. In: Ice Worlds of the Solar System. Springer, Cham. https://doi.org/10.1007/978-3-030-28120-5_5
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