AS101 Lecture 23

AS101 Lecture 23 - AS101 Lecture 23 Logistics: Night Lab:...

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Unformatted text preview: AS101 Lecture 23 Logistics: Night Lab: Last Lecture: Jovian planets Todays Lecture: Rings Solar system debris Important News 2 4 6 8 10 12 14 Frequency Grade Midterm 2 Mean: 70 2 4 6 8 10 12 14 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 Frequency Score Midterm Exam 1 Mean: 70 Density Differences 0.5 1 1.5 2 J u p i t e r S a t u r n U r a n u s N e p t u n e Density (g/cc) Uranus and Neptune are denser than Saturn because they have less H/He But that explanation doesnt work for Jupiter. David Daly-Coll: Why is Jupiter only twice as dense as Saturn? (It is 3 times as massive) The answer lies in stacking of pillows. After certain height, adding pillows do not increase height Orbital mechanics and moons These three moons orbit Saturn in a formation flying manner Why? Moon Dance by Janus and Epimetheus Why does this happen? Rings of the Jovian Planets Viewing Saturns Rings from Earth Galileos drawings Rings are as thin as a tissue paper spread across a football field Total mass: ~10 15 tons (how many kilograms?) Rings composed of many ringlets Ring Composition Particle size ranges from boulders to dust Each made of reflective H 2 O ice & rocks (dirty snowballs) Collisions keep ring thin Ring Spokes Rehana Rahman: Why do the rings go around the equator of the planet? Mostly dust Gaps in Rings Farrah Singh: Why cannot the rings be one solid sheet? Through perturbation, would collide with the planet Moons wandering into Roche limit may disintegrate Roche limit Distance from a planet within which a satellites own gravity will not hold an object on its surface. F tidal >F satellites gravity Rings and Roche limit When an object is within 2-3 times the radius of the planet ( Roche limit after E. Roche, 1847 ), its gravitational pull equals the gravitation of the object. Roche limit applies to objects whose gravity hold them together - smaller rocky objects are held together by electromagnetic force and can stay intact within the Roche region Roach limit versus Jovian Ring Extent Isabelle Soussou: What could run into ring particles?...
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AS101 Lecture 23 - AS101 Lecture 23 Logistics: Night Lab:...

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