SATURN - SATURN Smallermoons Shepherdingmoons...

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SATURN Smaller moons: Shepherding moons Prometheus (3) and Pandora (4) inside rings two closely spaced moons with a ring trapped between  them . . . . .  o outer moon slows particles down o inner moon speeds them up co-orbital moons numbers 9,10,11 o balance of gravity from Saturn and Tethys keeps small moons in place Phoebe (#18) retrograde orbit probably captured asteroid Intermediate size satellites (7 of them): mainly ice with some rock several have evidence for major collisions (fractures, large craters) Enceladus (#8) albedo almost = 1 very clean surface maybe ice volcanoes o from tidal forces (like Io around Jupiter)
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o orbital period of Dione (#12) is about 2x Enceladus Iapetus (#17) one side very dark other side very bright Figure 9.16 is a picture of Iapetus.  [Link to Figure 9.16] One large satellite: Titan (#15): 2nd largest in Solar System bigger than Mercury
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