1. Title

2. Jedicke Nature Paper

3. Nesvorny Icarus Paper

4. The S-Complex Conundrum

6. S/OC Spectra Comparison

7. 6 MC OB 3:1 JFC Meteorite Source Regions

8. S/C-Complex H<15 Semi-Major Axis Distribution  3:1

9. Nu6 animation EARTH VENUS MARS PERIHELION@ EARTH VENUS MARS APHELION@ JUPITER

10. Space Weathering?

11. Space Weathering

12. Space Weathering Agents

13. Space Weathering Modifiers

14. Space Weathering Evidence

15. Gaspra True Colour

16. Gaspra Enhanced Colour Fresh Surface Old Surface

17. Ida Enhanced Colour Fresh Surface Old Surface

18. Space Weathering in the Main Belt

19. The Data Collection Orbit Elements Absolute Magnitude Proper Elements SDSS Colors IRAS Albedo Family Membership SMASS 1 & 2 Spectra THIS STUDY

20. SDSS MOC

21. (Image credit: Fermilab Visual Media Services) SDSS Telescope (Image credit: Fermilab Visual Media Services)

22. http://www.astro.princeton.edu/PBOOK/camera/camera.htm SDSS Camera

23. SDSS sin(I) vs. Semi-Major Axis (Colour)

24. N43 SMASS vs. SDSS H-distn

25. N44 C-S-V SMASS SDSS Comparison

26. N45 PC2 vs. PC1 Type Comparison

27. Asteroid Families

28. Remnants

30. Asteroid Family Identification

31. Orbit Element Similarity

32. Osculating vs. Proper Elements

33. 3D Proper Elements

34. Hierarchical Clustering Method Hierarchical Clustering Method: Family membership requires that all family members are connected by a chain, where each member is attached to its neighbour by less than a limiting distance. d = n a [ 1.25 (  a/a) 2 + 2  e 2 + 2 (  sin i)^2 ] 1/2 Distance Metric:

35. N46 Stalagtite Diagram This axis is difficult to explain

36. N47 Family Velocity Cutoff Determination

37. Koronis Family 20 m/s Cutoffs http://www.boulder.swri.edu/~davidn/family/family.html

38. Koronis Family 50 m/s Cutoffs

39. Koronis Family 100 m/s Cutoffs

40. Family Proper e & sin(I) vs. semi-major axis

41. N48 Eccentricity vs. Semi-major Axis Family/Background

42. 3D Family Proper Element Blobs

43. Asteroid Family Dating

44. 3 Techniques

45. Yarkovsky Spreading

46. Adeona Family Spreading Carruba et al. (2003), Icarus 162, Issue 2, p. 308-327.

47. N49 Yarkovsky Drift

48. Dynamical Integration

49. Nesvorny et al., Science 417, 720-722 Karin Members Koronis Members Isotropic ejection at  V=15m/s with different and  Best ‘fit’ with collision at perihelion Karin Cluster proper e & I vs. a

50. Karin Cluster w & O vs. time Nesvorny et al., Science 417, 720-722

51. Principal Component Colors

52. Principal Component Definition

53. N50 PC2 vs. PC1 Background & Family Members

54. N51 Family PC2 vs. PC1

55. N52 Average Slope vs. PC1

56. Asteroid Family Dating Space Weathering Rate

57. S-Complex PC1 vs. Age

58. Space Weathering Equation PC 1 (t) = PC 1 (0) +  PC 1 [1-exp(-t  Assuming a constant flux of a‘Space Weathering agent’: PC 1 (t) = PC 1 (0) +  PC 1 [1-exp(-t    Generalized to: PC 1 (0)  0.32±0.01 With:   0.50±0.05    PC 1  1.0±0.1

59. N53 PC1 vs Age S & C Complex

60. N54 Koronis Karin Comparison

61. N55 Themis Veritas Comparison

62. S/C/OC PC1 Comparison

63. Other Space Weathering Effects?

64. Albedo vs. Age

65. PC1 vs. Absolute Magnitude DIAMETER

66. 2MASS Colors vs. Age

67. Future Work…

68. Space Weathering Rate sensitivity

69. Spectroscopic Campaign

70. PC1 S/C Family/Background

71. Thank-you