Title. Jedicke Nature Paper Nesvorny Icarus Paper.

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Presentation transcript:

Title

Jedicke Nature Paper

Nesvorny Icarus Paper

The S-Complex Conundrum

S/OC Spectra Comparison

6 MC OB 3:1 JFC Meteorite Source Regions

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

Nu6 animation EARTH VENUS MARS EARTH VENUS MARS JUPITER

Space Weathering?

Space Weathering

Space Weathering Agents

Space Weathering Modifiers

Space Weathering Evidence

Gaspra True Colour

Gaspra Enhanced Colour Fresh Surface Old Surface

Ida Enhanced Colour Fresh Surface Old Surface

Space Weathering in the Main Belt

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

SDSS MOC

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

SDSS Camera

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

N43 SMASS vs. SDSS H-distn

N44 C-S-V SMASS SDSS Comparison

N45 PC2 vs. PC1 Type Comparison

Asteroid Families

Remnants

Asteroid Family Identification

Orbit Element Similarity

Osculating vs. Proper Elements

3D Proper Elements

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)  e (  sin i)^2 ] 1/2 Distance Metric:

N46 Stalagtite Diagram This axis is difficult to explain

N47 Family Velocity Cutoff Determination

Koronis Family 20 m/s Cutoffs

Koronis Family 50 m/s Cutoffs

Koronis Family 100 m/s Cutoffs

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

N48 Eccentricity vs. Semi-major Axis Family/Background

3D Family Proper Element Blobs

Asteroid Family Dating

3 Techniques

Yarkovsky Spreading

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

N49 Yarkovsky Drift

Dynamical Integration

Nesvorny et al., Science 417, 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

Karin Cluster w & O vs. time Nesvorny et al., Science 417,

Principal Component Colors

Principal Component Definition

N50 PC2 vs. PC1 Background & Family Members

N51 Family PC2 vs. PC1

N52 Average Slope vs. PC1

Asteroid Family Dating Space Weathering Rate

S-Complex PC1 vs. Age

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

N53 PC1 vs Age S & C Complex

N54 Koronis Karin Comparison

N55 Themis Veritas Comparison

S/C/OC PC1 Comparison

Other Space Weathering Effects?

Albedo vs. Age

PC1 vs. Absolute Magnitude DIAMETER

2MASS Colors vs. Age

Future Work…

Space Weathering Rate sensitivity

Spectroscopic Campaign

PC1 S/C Family/Background

Thank-you