Lesson 12 – Jovian Moons and Rings, Dwarf Planets.docx - AS...

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AS 101: Astronomy I: Our Place in the CosmosLesson 12 – Jovian Moons and Rings, Dwarf PlanetsDecember 2nd– 5th, 2019Learning Outcomes:-Describe the composition of the major moons-Describe the composition and other general characteristics of the four Galilean moons-Identify at least 4 of Uranus’ moons including the common theme in their names-Identify Neptune’s largest moon and describe why it’s known as the backward moon-Describe and explain Saturn’s rings including the divisions, thickness, origin and influence of theshepherd moons-Describe common features of dwarf planets in the solar system, including why Pluto is now consideredamong themJovian Moons and RingsMoons can be divided into3 groups:o(1)Small Moons(less than 300 km in diameter)o(2)Medium sized Moons(300 – 1500 km in diameter)o(3)Large Moons(greater than 1500 km in diameter)Most moons are in thesmallcategory & haveirregularshapeoGravity is too small to force them into spherical shapeMany haveunusual orbitsMoons in themediumandlargecategory have orbital properties that formed in “miniature solarnebulaeoHaving circular, equatorial, prograde orbitsoMost are sphericaloSome have atmospheres, hot interiors, and magnetic fieldsVoyagerflybys provided initial impression of the Jovian MoonsoGalileoandCassiniorbiters have recently provided much more information of Jupiter andSaturn’s moonsMost Jovian moons are geologically active & have large amounts of surface iceoInteriors are similar to terrestrialsGalilean Moons of Jupiter
AS 101: Astronomy I: Our Place in the CosmosLesson 12 – Jovian Moons and Rings, Dwarf PlanetsDecember 2nd– 5th, 2019Not the closest to Jupiter; but they are thebiggestIo, Europa, Ganymede and CallistooMythological lovers of Roman god JupiteroAll formed around Jupiter throughaccretion process(same as the solar system)Currently, 79 known moons of JupiterThree inner moons orbit Jupiter in a 1:2:4 resonanceIOspins fastestGANYMEDEspins slowestGalilean Moons of Jupiter – IoEllipticalorbitoCreates significant tidal forces – results in continuoustidal heatingand an active planetoResult of thermal energy supplies 24 tons of TNT everysecond to planet’s interiorEnergy makes way to surface through crust weakness (volcanos) spewing out sulfergassesThe most volcanically active objectin the solar systemGenerates its own magnetic field – produced by Io’s molten interiorGalilean Moons of Jupiter – EuropaSmoothest bodyin the solar systemCompletelycovered with water ice– few km thickLines covering the surface are fractures in the iceoCaused by tidal forces of Jupiter & other moonsBrown areas = rocky deposits from impacts from Europa’s interiorGalilean Moons of Jupiter – Ganymede and Callisto (Fraternal Twins)Ganymedelargest moonin solar systemCallisto– similar in appearanceoBOTH have…Impact cratersPatterns of light and dark markingsReveal effects of tectonic action

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Term
Winter
Professor
ArthurRead
Tags
Solar System, Planet, Neptune, Natural satellite

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