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Ge/Ay133

What can the asteroid belt tell us about the early S.S.?. 433 Eros. ?. Phobos. Ge/Ay133. These types are not strongly separated, radially.

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Ge/Ay133

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  1. What can the asteroid belt tell us about the early S.S.? 433 Eros ? Phobos Ge/Ay133

  2. These types are not strongly separated, radially.

  3. Comets are icy bodies that sublimate and become active whenclose to the Sun. They are believed to originate in two coldreservoirs beyond the orbit of Neptune: the Kuiper Belt (equilibriumtemperatures of ~40 kelvin) and the Oort Cloud (~10 kelvin). Wepresent optical data showing the existence of a population ofcomets originating in a third reservoir: the main asteroid belt.The main-belt comets are unlike the Kuiper Belt and Oort Cloudcomets in that they likely formed where they currently resideand may be collisionally activated. The existence of the main-beltcomets lends new support to the idea that main-belt objectscould be a major source of terrestrial water. See also http://www.ifa.hawaii.edu/~hsieh/mbcs.html

  4. Asteroid Itokawa as imaged by the Hayabusa probe. http://www.isas.jaxa.jp/e/snews/2005/1102.shtml

  5. Collisions II

  6. How do we measure rotation states? • Lightcurves (lots of objects) • Radar measurements (NEOs) • Spacecraft exploration Toutatis Radar Image

  7. What do simulations tell us about the asteroid belt? Hard to generate observed properties with just Jupiter & planetesimals or single large core, need mixture: Jupiter inserted at 10 Myr

  8. Radial mixing extends over several 0.1 AU May help explain the spatial overlap of the various types? What about the large fraction of bodies that are strongly scattered?

  9. What determines the water content of the inner S.S.?

  10. D/H ratios argue that comets did not deliver the bulk of the water…

  11. Suppose there is an initial snow line… What happens?

  12. In such a story, the orbital properties of Jupiter are critical…

  13. What sort of systems emerge? Hierachical (most mass added in large collisions), so great variety, both in orbital properties… … and ultimate water content.

  14. Question for later: What determines whether a planet is “habitable”? How much can the water vary? What is the maximum eccentricity for which liquid water can be maintained over several AE?

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