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Bit of Administration ….

Bit of Administration …. Reading BSNV Chap. 13 Portfolios Due Thursday, April 29 , because of possible TAA strike Put in box outside 6522 Sterling All 5 must be securely bound together, including ones already graded Late portfolios will lose credit Lab 3

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Bit of Administration ….

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  1. Bit of Administration …. • Reading • BSNV Chap. 13 • Portfolios • Due Thursday, April 29, because of possible TAA strike • Put in box outside 6522 Sterling • All 5 must be securely bound together, including ones already graded • Late portfolios will lose credit • Lab 3 • Due Thursday, April 29, because of possible TAA strike • Put in box outside 6522 Sterling • Problem 5, HW 1 is a good starting point for the lab questions • Note typo in Question 3 - “Jupiter” => “Saturn”

  2. Jovian Rings Jupiter Saturn Uranus Neptune

  3. Jovian Rings • Saturn A B C Cassini’s Division

  4. Jovian Rings • Saturn 70, 000 km across …. 20 m thick!

  5. Jovian Rings • Saturn Velocity A>Velocity B Keplerian! Blueshift S Earth A B Redshift

  6. Jovian Rings • Saturn Snowflakes (few microns) to Boulders (10 m)

  7. Sat 1 2 1 km 1000 km Jovian Rings • Dynamics - Roche Limit • Radius Inside Which Large Bodies Fragment Due to Tidal Forces • (i.e., differences in gravitational forces) 1.002 x Greater Gravitational Force on Moon 2 Gravitational Force on Moon 1

  8. 1 km Sat 1 2 1 km Jovian Rings • Dynamics - Roche Limit • Radius Inside Which Large Bodies Fragment Due to Tidal Forces • (i.e., differences in gravitational forces) 4 x Greater! Gravitational Force on Moon 2 Gravitational Force on Moon 1

  9. Jovian Rings • Dynamics - Roche Limit • Radius Inside Which Large Bodies Fragment Due to Tidal Forces • (i.e., differences in gravitational forces) • Rings formed by … • Moon entering within Roche limit? • Material originally inside Roche limit that never • formed a moon? • Slow destruction of small moons within Roche limit • by micrometeorites?

  10. Jovian Rings • Dynamics - Cassini Division - Tidal Resonance • Suppose ….

  11. S S S Jovian Rings • Dynamics - Cassini Division - Tidal Resonance • Suppose …. Mimas

  12. Jovian Rings • Dynamics - Cassini Division - Tidal Resonance • Orbital Period of Mimas is 2x Orbital Period • of particles in Cassini’s Division • “2 to 1 Resonance” • Repeated gravitational pulls clear gap at that orbit.

  13. Jovian Rings • Dynamics - Shepherd Satellites 100 km

  14. Jovian Rings • Dynamics - Shepherd Satellites Saturn

  15. Jovian Rings • Dynamics - Shepherd Satellites

  16. Jovian Rings • Uranus and Neptune

  17. Jovian Rings • Uranus and Neptune - Weather

  18. Jovian Rings • Uranus and Neptune - Weather

  19. Jovian Rings • Uranus and Neptune - Interior Structure

  20. Jovian Rings • Uranus and Neptune - Rotation and Magnetic Fields

  21. Jovian Rings • Uranus and Neptune - Moons Retrograde, inclined orbit - captured? 38 oK

  22. Jovian Planets • Summary • Weather (“Atmospheric Dynamics”) • Driven by energy flows • Thermal from interior • Residual heat from formation • Ongoing contraction • Gravity (highs to lows) • Solar radiation • Rapid rotation + Coriolis leads to twisting motions • Magnetic fields • Result from • Liquid metallic interiors • Rotation • Convection

  23. Jovian Planets • Summary • Giant Moons • Ice and rock (from condensation sequence) • Dynamically active (due to tidal forces) • Atmospheres (Io, Titan, Triton) • Liquid oceans (Europa?, Titan?) • Life ?

  24. Asteroids, Comets, Meteors, and Pluto

  25. Asteroids, Comets, Meteors, and Pluto

  26. Asteroids, Comets, Meteors, and Pluto • Asteroids

  27. Asteroids, Comets, Meteors, and Pluto • Asteroids

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