1. Final Exam Wednesday December 18at 9:30 AM Covers Chapters 11 & 12 Allowed one sheet of notes writing on one side

2. HST Image

4. 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.

6. 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.

8. 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.

12. 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.

13. Discussion Should Eris be considered a planet?

15. Orbit of Eris

17. Same as Pluto?

21. 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.

23. Ceres

24. Dawn

25. Vesta

29. Ida

30. Mathilde

32. Discussion What do you think causes the gaps in the asteroid belt?

33. Kleopatra

34. Comets

35. 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.

39. Comet Hale- Bopp

40. Blue ion tail White dust tail

41. Comet tail always point away from the sun

43. Comet McNaught 2007

44. Comet Encke

46. Tempel 1