Lect2 Bottke Overview (09-24-09)

Lect2 Bottke Overview (09-24-09) - Assignment due Thurs Oct...

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Assignment due Thurs. Oct 1. Hard-copy Chapter by Gaffey et al. In Asteroids II (NOT III) book. Abstract and Sections I, II, (not III) IV,V, VI, (not VII) and VIII
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Comparing the Terrestrial Planets
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Asteroids III Ch. 1 “An Overview of the Asteroids: The Asteroids III Perspective” Bottke et al.
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Outline 1. Introduction 2. Brief History of the Primordial Asteroid Belt 3. Present State of Main Belt 4. The Near-Earth-Object Population 5. Predicting the Future
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1. Introduction Two main reasons why we study asteroids Even though asteroids represent only a tiny fraction of the total mass of the terrestrial planets, their large numbers, diverse compositions, and orbital distributions provide powerful constraints for planet formation models. Some of these bodies are capable of striking Earth with enough energy to produce severe or possibly catastrophic damage to our civilization. Main advances since Asteroids II book
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1. Brief History of the Primordial Asteroid Belt 2.1 Formation of Main-Belt asteroids: Linked to planet formation, particularly terrestrial Timescales. Meteorites provide the clock for timing planetesimal formation, e,g., CAIs formed about two million years before chondrules and accretion into asteroids Thermal evolution: Accretion time, e.g., early: more 26 Al, more heat Composition of accreted material, e,g., further out more water Thickness and thermal conductivity of asteroid’s regolith Asteroid’s final diameter e.g., why Vesta differentiated and Ceres did not?
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1. Brief History of the Primordial Asteroid Belt 2.1 Formation of Main-Belt asteroids: why Vesta differentiated and Ceres did not? Possible solution for this frequently-cited main-belt enigma: (4) Vesta, a D = 530 km asteroid in the inner main belt (2.36 AU), has differentiated while (1) Ceres, a much larger D = 930 km asteroid in the
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This note was uploaded on 11/09/2009 for the course AST 4142 taught by Professor Campins during the Fall '09 term at University of Central Florida.

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Lect2 Bottke Overview (09-24-09) - Assignment due Thurs Oct...

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