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Transcript
Minor Bodies of the Solar System Chapter 7 Kepler’s Laws • 1. Planets orbit the sun in elliptical orbits with the sun at one focus of the ellipse Keper’s Second Law • As a planet moves in its orbit, a line connecting the planet to the sun sweeps out equal areas in equal times Kepler’s Third Law • P2 = a3 (provided the period is in Earth years and the semi-major axis in astronomical units) The Main Asteroid Belt Ceres: Largest Main Belt Asteroids Gaspra and Ida (and Dactyl) Mathilde and Eros NEAR close-ups of Eros Resonances in the Asteroid Belt Main Asteroid Types • • • • • • C type: carbonaceous, low albedo S type: stony or stony-metallic, redder E type: high albedo, magnesium silicate D type: very dark and red M type: mostly iron and nickel E, S, and M types may be fragments from a larger body that underwent differentiation Asteroid Light Curves • Antigone Kuiper Belt and Oort Cloud Pluto: Planet or Kuiper Belt Object Pluto Sedna Comets: Dirty Snowballs SOHO Comets Comets Hyakutake and Hale-Bopp Impact with Comet Tempel 1 at 23,000 mph on July 4, 2005 Shoemaker Levy 9 Hits Jupiter July 1994 Meteors and Meteorites Meteor Showers
