Chapter 11b Moons and Rings of the Jovian Planets.docx -...

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Chapter 11b Moons and Rings of the Jovian PlanetsThe moons of the Solar System come in 3 main size categories:oPlanet-sized moons – moons greater than 1000 miles in diameter7 of these in SS:Ganymede, Titan, Callisto, Io, Luna, Europa, TritonoModerate sized moons – moons 250-1000 miles in diameter, spherical in shape6 Saturnian:Mimas, Enceladus, Tethys, Dione, Rhea, Iapetus5 Uranian:Miranda, Ariel, Umbriel, Titania, Oberon2 Neptunian:Proteus, Nereid1 Plutonian:CharonoAsteroid/Comet sized moons – moons <250 miles in diameter, irregularly shaped,usually captured asteroids & or cometsMars – 2, Jupiter – 63, Saturn – 56, Uranus – 22, Neptune – 11, Pluto – 4,Eris – 1, Haumea -2Moons can also be classified as being eitherRegularorIrregularoRegular – moons that orbit same direction as their planet’s spin (prograde), hasfairly circular orbits and orbits close to the planet’s equatorial planeIndicates moon most likely formed with the planetAll planet sized moons (except Triton), most moderate sized moons androughly half of the asteroidal moons are RegularoIrregular – moon that orbits opposite its planet’s spin (retrograde), has ellipticalorbits and usually orbits at a significant inclination to the planet’s equatorial planeIndicates moon was most likely captured by planetTriton and roughly half of the asteroidal moons are IrregularMOONS of JUPITER – currently 67 moons:4 tiny inner moonsoMetis (27 miles), Adrastia (10 miles), Amalthea (104 miles) , Thebe (61 miles)oAll are covered in reddish sulfur dust from Io’s volcanoes, Amalthea is reddestobject in solar system.Amalthea also generates more heat than it receives from SunoDebris knocked off Adrastia and Metis create the main ring, Amalthea createsthe Amalthea gossamer ring and Thebe creates the Thebe gossamer ringoMetis and Adreastia are inside line of synchronous rotation and all 4 are tidelockedIooOrbits Jupiter in 1 day 18 hrs at 262,000 miles (a little over Earth-moondistance)oDiameter – 2,263 miles; Density – 3.53 (rocky/metal composition); densestGalileanoInterior – Iron-sulfur core, silicate mantle & crust – little or no water iceoThe Pizza Moon - intense volcanic activity – thousands of times as active asEarth; all volcanoes are hotspot volcanoeso400+ volcanoes eject basaltic silica lava, vaporous sulfur, sulfur dioxide &hydrogen sulfideExtremely tenuous atmosphere of sulfur dioxideNo impact craters, magnetic field strong as Mercury’s135 tall mountains – a few as much as 30,000 ft tall – but no plate tectonicsoIo Torus – ring of plasma made of sulfur and oxygen from Io’s volcanoes andpowered by Jupiter’s magnetic fieldoFlux tube – electric plasma conduit between Jupiter and IooGravitational flexing from Jupiter and Europa powers the volcanoesEuropaoOrbits Jupiter in 3 days 13 hrs at 416,000 miles
oDiameter – 1,935 milesoDensity – 3.02 (rocky/metal composition, with water/ice covering)oThe Billiard Ball – smooth, bright surface – no mountains, few cratersoSurface criss-crossed with lineao

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Term
Spring
Professor
Dahm
Tags
Natural satellite, miles, Moons of Jupiter, Moons of Saturn

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