Ch8

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Unformatted text preview: Astronomy 1F03 2010/11 Fall Term 2010/11 Chaisson & McMillan, Astronomy Chapter 8 Moons, Rings and Pluto Outdoor observing Outdoor First night: Thursday, Oct 14, 7:30 First Outside ABB (physics) at the front Outside Check Avenue for confirmation Check If weather is bad it will be cancelled If Midterm Midterm Wed, Oct 20, 7 pm 1 hour Wed, Location: T29 (rooms 101,105) Location: Chapters 0-8, material covered in lecturers Chapters Written answer/simple calculation questions similar to problem sets similar For practice, look at problems at end of chapters chapters Overview: Overview: Moons, Rings and Pluto The moons in the outer solar system range from asteroid sizes to larger than Earth’s Moon (and Mercury) Earth Every Jovian planet has rings Every Rings are closely related to moons Rings Moon Count Oct 2010 Oct Planet Planet Mercury Mercury Small objects are Venus hard to observe (asteroids, Comets, Earth Kuiper Belt Objects) Mars Kuiper Over time, smaller Jupiter moons keep getting Saturn discovered around Uranus Neptune the giant planets the (Pluto) Moon Count 0 0 1 2 63 62 27 13 3 The Large Moons The There are 6 large Moons in the outer solar system the Jupiter: Io, Europa, Europa Ganymede, Callisto Callisto Saturn: Titan Saturn: Neptune: Triton Neptune: 0.3-2 Earth Moon masses 0.3 Earth (Pluto 0.17) (Pluto Earth’s Moon Jupiter Io Europa Ganymede Callisto Orbit (Planet Radii) 60 5.9 9.4 15.0 26.3 20.3 Mass Mass (Earth Moons) 1 1.22 0.65 2.02 1.46 1.83 0.29 Saturn Titan Neptune Triton 14.3 Jupiter’s Jupiter Galilean Moons Galilean Jupiter’s four large moons were first seen four by Galileo Galilei (in 1610) Galilei Named by Simon Marius: Io, Europa, Ganymede and Callisto Io, Europa Ganymede Callisto Jupiter’s Moons: Jupiter Io Volcanically active Volcanically Smooth yellowy surface, lots of sulphur sulphur compounds Thin Sulphur atmosphere Sulphur Jupiter’s Moons: Jupiter Io Strong tides of Jupiter stretch, compress to heat interior continuously compress Nearly entirely molten Can’t get tidally locked because of Can get orbital interactions with Europa Europa Jupiter’s Moons: Jupiter Europa Europa has a cracked ice Europa has surface surface Cracked and refrozen Cracked Europa probably has a Europa probably liquid ocean beneath liquid Kept warm by Jupiter’s Kept tidal squeezing tidal Salty ocean gives rise to magnetic field magnetic Jupiter’s Moons: Jupiter Ganymede Largest Moon Largest Moonlike except water flows replace lava f...
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This note was uploaded on 04/10/2011 for the course ASTRONOMY 1f03 taught by Professor Wadsley during the Spring '11 term at McMaster University.

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