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Ch. 12 Dwarf Planets

Ch. 12 Dwarf Planets. There are several kinds of objects in our Solar System Terrestrial planets and Jovian planets, with satellites (moons) Dwarf planets (which can also have moons) and “small solar system bodies” – asteroids, comets and meteoroids

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Ch. 12 Dwarf Planets

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  1. Ch. 12Dwarf Planets There are several kinds of objects in our Solar System Terrestrial planets and Jovian planets, with satellites (moons) Dwarf planets (which can also have moons) and “small solar system bodies” – asteroids, comets and meteoroids Objects are still being classified: Kuiper Belt Objects, Plutoids, Plutinos, Trans-Neptunian Objects (TNOs), Oort cloud objects

  2. From largest to smallest, the objects in the Solar System can be classified into categories Notice that there is some overlap among objects of the same size.

  3. The period of Pluto’s orbit is 248 years.

  4. The orbit of Pluto is tilted and elliptical (e = 0.25)

  5. Kuiper Belt Objects Compared to Moon and Earth. Notice that we think Triton was captured by Neptune, and is really an object like Pluto and the KBOs.However, the New Horizons results show that Triton and Pluto are quite different. Also see this web page about KBOs: http://www2.ess.ucla.edu/~jewitt/kb.html

  6. Eris is a dwarf planet even further than Pluto.

  7. Dwarf Planets – five known so far • Dwarf planets are round due to gravity, but not big enough to clear out the other objects in their orbit. • In 2006 three objects—Pluto, Ceres, and Eris—were classified as dwarf planets. Later, we observed Haumea and Makemake, so there are 5 dwarf planets. • Ceres is in the asteroid belt; the other dwarf planets are in the Kuiper Belt out past Neptune . • Many other objects orbit the Sun beyond Neptune. For example, at least 1277 KBO’s have been observed. A few potential Oort cloud objects have also been identified. New classification schemes are being proposed. • Lists are at https://en.wikipedia.org/wiki/Dwarf_planet

  8. The orbit of Sedna is huge compared to even the Kuiper belt, and may extend to the Oort cloud.

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