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Solar System Debris - Asteroids - Comets - Meteoroids

Solar System Debris - Asteroids - Comets - Meteoroids. Asteroids - First one discovered in 1801 - 1,000’s catalogued, probably millions exist - largest is Pallas (520 km in dia.) - most less than 1 km in dia. - composed of rock - most reside in the Asteroid belt, 2 - 3.5 AU from Sun.

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Solar System Debris - Asteroids - Comets - Meteoroids

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  1. Solar System Debris - Asteroids - Comets - Meteoroids

  2. Asteroids - First one discovered in 1801 - 1,000’s catalogued, probably millions exist - largest is Pallas (520 km in dia.) - most less than 1 km in dia. - composed of rock - most reside in the Asteroid belt, 2 - 3.5 AU from Sun

  3. - Trojan Asteroids: 60 degrees in front of and behind Jupiter - Apollo Asteroids: have Earth-crossing orbits

  4. Ida Dactyl

  5. Kirkwood Gaps in the Asteroid Belt

  6. Asteroid Types - C-type: Carbon-rich (carbonaceous), very dark (3-4% reflectivity), primitive, 75% of all asteroids

  7. - S-type: Stony composition not as dark (20% reflectivity), primitive, 17% of all asteroids

  8. - M-type: Metallic composition (Fe, Ni) not as dark (20% reflectivity), differentiated, 8% of all asteroids

  9. An Asteroid strike 65 million years ago?

  10. The Evidence

  11. The Evidence 1. The K-T boundary No Dinosaur fossils K-T Boundary Dinosaur fossils

  12. 2. Chicxlub Crater, Yucatan Peninsula 180 km

  13. 3. Tektites and shocked quartz

  14. Winslow Crater, Arizona

  15. Comets

  16. - chunks of ice, dust and rock - ices: water, methane, ammonia - contain hydrocarbons, amino acids - most located in the Kuiper Belt and Oort Cloud - probably billions exist in our solar system

  17. Location of Kuiper Belt - 30 -50 AU from Sun

  18. Image of a Kuiper Belt Object

  19. 100,000 AU

  20. Anatomy of a Comet

  21. Dust Tail Ion Tail Sun

  22. Comet Hale-Bopp

  23. Hale-Bopp

  24. Comet Halley - 1910

  25. Nucleus of Comet Halley

  26. Meteoroids

  27. 1. Meteoroids: small chunks of asteroids or debris from comets 2. Meteors: trail of ionized air as meteoroid passes through atmosphere 3. Meteorites: a meteoroid that reaches the ground

  28. Meteorites - Stony (95%) - Iron (4%) - Stony-Iron (1%) - Carbonaceous Chondrites: stony meteorites with carbon compounds, water, and amino acids

  29. Stony meteorites found near Tucson

  30. Iron meteorites from Winslow Crater

  31. Stony-Iron meteorite found in Kansas

  32. Carbonaceous Chondrite

  33. Meteor showers - Earth passes through debris trail from a comet - occur regularly

  34. Some Meteor Showers Name Date of Meteors / Hour Parent Maximum at Max Quadrantids Jan. 4 110 -- Perseids Aug. 12 68 Comet 1862 III Orionids Oct. 21 30 Comet Halley Leonids Nov. 17 10 Comet P/Tempel-Tuttle Geminids Dec. 14 58 3200 Phaethon

  35. The Radiant of a meteor shower

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