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Final Exam Wednesday December 18at 9:30 AM Covers Chapters 11 & 12 Allowed one sheet of notes writing on one side
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HST Image
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The end of Planet X Pluto is much too small to be planet X. Voyager flyby of Uranus and Neptune provided much more accurate masses of those planets. With the better masses, planet X was no longer required.
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Trans-Neptune Objects Kuiper belt lies between 30 AU (the distance to Neptune) and about 50 AU. It contains a large number of small, icy bodies that orbit the Sun beyond Neptune. Since the first one was discovered in 1992, over 1200 more have been identified.
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Plutinos, the little Plutos Approximately 1/4 th of the TNO’s discovered to date are in a 3-2 resonance with Neptune the same as Pluto.
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10 th Planet? Eris, goddess of warfare and strife, is 2400 km in diameter, 27% more massive than Pluto and has a satellite Dysnomia, daughter of Eris and the demon spirit of lawlessness.
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Discussion Should Eris be considered a planet?
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Orbit of Eris
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Same as Pluto?
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Planets & Dwarf planets Dwarf planet: any object that orbits the Sun, not another planet, with enough mass to make it round. Planet: any dwarf planet that has enough gravitational influence to clear its orbit of other objects.
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Ceres
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Dawn
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Vesta
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Ida
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Mathilde
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Discussion What do you think causes the gaps in the asteroid belt?
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Kleopatra
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Comets
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3 types of Comets Short period – those with orbital periods less than 20 years. Intermediate period – those with orbital periods between 20 and 200 years. Long period – those with orbital periods greater than 200 years.
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Comet Hale- Bopp
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Blue ion tail White dust tail
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Comet tail always point away from the sun
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Comet McNaught 2007
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Comet Encke
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Tempel 1
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