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Class 22: Space Junk (I)

Class 22: Space Junk (I). Class 22: Space Junk (I). Class Updates • Reading: 23.10 • Lecture schedule update • Homework & Exams returned. Today’s topics: • Asteroids • Meteor-stuff • Comets. Asteroids. Ida. Mathilde. Gaspra. Asteroid Locations. NEAs This Week.

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Class 22: Space Junk (I)

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  1. Class 22: Space Junk (I)

  2. Class 22: Space Junk (I) Class Updates • Reading: 23.10 • Lecture schedule update • Homework & Exams returned Today’s topics: • Asteroids • Meteor-stuff • Comets

  3. Asteroids Ida Mathilde Gaspra

  4. Asteroid Locations

  5. NEAs This Week http://neo.jpl.nasa.gov/ca/

  6. Chicxulub A Bad Day…. 65 Million Years Ago

  7. Asteroid Shapes & Sizes Mars

  8. Asteroid Distances

  9. Mini Moons of Asteroids small moon (1.5 km) Ida (100 km)

  10. Eros gravity Asteroid Mission: NEAR close-up image

  11. Eros Up Close

  12. Upcoming Mission: DAWN Vesta Ceres

  13. Meteor-stuff

  14. Incoming Debris Peekskill, NY August 1992

  15. Definitions

  16. Challenge Question Suppose that you are hiking along the icy banks of an Antarctic glacier and you stumble upon a very odd looking rock, which you later confirm to be a chunk of an asteroid that fell to Earth. Which of these is the proper scientific name of your discovery? Comet Meteoroid Meteor Meteorite

  17. Meteor Showers Leonids, 11/2001 Perseids, 8/2004

  18. Earth’s largest meteorite….thus far Namibia 66-110 tons Hoba Meteorite

  19. Asteroid Vesta Mars Moon (meteor showers only) Origins & Ages of Meteors

  20. • Irons (6% falls, 66% finds) • like Earth core (melting) • debris asteroid core? • • Stones (92% falls, 26% finds) • rocky material (silicates) • ancient solar system • Carbonaceous chondrites • • Stony-Iron (2% falls, 8% finds) • asteroid core/mantle? Compositions (carbon, volatiles) (glassy beads, grains)

  21. Where are meteorites found? Bill Cassidy

  22. Meteor Crater Northern Arizona

  23. More Terrestrial Craters Wolfe Creek, Australia Manicouagan, Quebec, Canada Gosses Bluff, Nor. Territory, Australia Clearwater Lakes, Quebec, Canada

  24. Hits & Misses • Human strike: Annie Hodges; Sylacauga, AL; bruised; 11/30/54 • Animal strike: Dog; Nakhla, Egypt; 6/24/11 • Structures: Donahue home; Wethersfield, CT; 11/8/82 Chevrolet; Peekskil, NY; 8/9/92 Donahue meteorite Peekskil Chevy

  25. Comets May 7, 2004

  26. Gas Tail Tail Head Comet West Anatomy of a Comet

  27. Nucleus: nucleus nucleus surface coma Comet Head

  28. Nucleus: Comet Wild 2

  29. Comet Tails

  30. Sunlight = Tails (movie)

  31. Where does gas tail point?

  32. Where do comets originate? (I) Halley’s Comet Sedna

  33. Comet Hyakatuke Comet Hale Bopp Where do comets originate? (II)

  34. Comet Shoemaker-Levy 9

  35. Review Which is which? 2 1 3 (1) comet; (2) meteor; (3) comet (1) asteroid; (2) meteor; (3) comet (1) comet; (2) asteroid; (3) meteor (1) meteor; (2) asteroid; (3) comet

  36. Challenge Question Tunguska, Russia On the morning of June 20, 1908 witnesses described a brilliant fireball, brighter than the Sun, streak across the sky. Still de- scending, it exploded with a blinding flash & an intense pulse of heat. The blast was heard up to 1000 km away; the resulting pulse of air pressure circled Earth twice. 1000s of tons of a powdery material resembling carbonaceouschondrites were later found scattered in the soil. What do you think was the likely source of the Tunguska event? Trees flattened out to 30 km

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