Lect5 Bell Big Picture AstII (10-06-09)

Lect5 Bell Big Picture AstII (10-06-09) - Big Picture by...

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Unformatted text preview: Big Picture by Bell et al. Asteroids II October 6, 2009 Outline of “Big Picture”in Asteroids II I. Introduction II. Review of Relevant Data A. Meaning of Taxonomic Types (Table 1) B. Stratigraphy of Asteroid Belt (Fig. 1) C. Compositional Meaning of Tholen-Space (Fig. 2) D. Collisional and Dynamical History: collisionally evolved population I. Some Baffling Paradoxes A. The Ordinary Chondrite Mystery B.The Great Dunite (Olivine) Shortage IV.The Model A. Condensation Locations B. Heating Episode A. Collisional Evolution I. Model Predictions (see list) Review: Condensation of Solids from Solar Nebula (condensation sequence) I. Intro Purpose of Chapter: Construct a simple model of the evolution of asteroid belt based on all available observations Review from two weeks ago : Mean spectra of asteroid types according to Tholen (1984) . II. Review of Relevant Data: A. Meaning of Taxonomic Types Based in part on Table III from Gaffey et al. Asteroids II (covered last week) II. Review of Relevant Data: B. Stratigraphy of the Asteroid Belt Distribution of Asteroid Types Distribution of Compositions in the Asteroid Belt Distribution of asteroid classes Inner belt dominated by silicate-rich (S) – Differentiated? Outer belt dominated by carbon-rich (C, D, F) – Primitive? Implications • Little mixing • Best argument against “exploded planet” hypothesis Distribution of asteroid classes with semi-major axis. This version from www.astro.lsa.umich.edu/~cowley . Originally from J. F. Bell et al. (1989, Asteroids II, 921-948) II. Review of Relevant Data: C. Compositional Meaning of Tholen-Space • Use two-dimensional graphs to plot parameters that convey information contained in many spectra, e.g., Fig. 2 • Since the two parameters used by Tholen to classify spectra did not include compositional interpretations Bell et al decided to check if the mineralogical interpretations in Table I are consistent with Tholen’s plots, Figure 2 • Figure 2a. Primitive and metamorphic superclasses. • Primitive asteroids (C, P and D) on a line that seems to be due to the original condensation sequence. • Types K and Q are not part of this simple trend. • Types B, F, G and T may be heated and metamorphosed C asteroids II. Review of Relevant Data: C. Compositional Meaning of Tholen-Space II. Review of Relevant Data: C. Compositional Meaning of Tholen-Space • Figure 2b. Igneous Asteroids, fit nicely in Bell’s three- component mix of olivine/pyroxene/NiFe • The agreement between Tholen’s purely mathematical “principal component” analysis and Table I, supports Bell’s mineralogical interpretation as well as the possible origin and relationships of the asteroid types....
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Lect5 Bell Big Picture AstII (10-06-09) - Big Picture by...

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