PTYS_411_511_6_Lec24-041707_astroids_meteor

# PTYS_411_511_6_Lec24-041707_astroids_meteor - Asteroids and...

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PTYS/ASTR 206 Asteroids/Meteorites 4/17/07 Asteroids and Meteorites

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PTYS/ASTR 206 Asteroids/Meteorites 4/17/07 Announcements Reading Assignment Read Chapter 16 Term Paper Due Today Details of turnitin.com Go to www.turnitin.com Click on “new users” usertype student Class ID: 1868418 Password: Section2
PTYS/ASTR 206 Asteroids/Meteorites 4/17/07 Semantics Asteroids Small rocky bodies in orbit about the Sun Comets Small bodies that orbit the Sun and (at least occasionally) exhibits a coma (or atmosphere) and/or a tail Meteoroids Small asteroids Meteorites the debris collected on Earth Meteors A brief flash of light (i.e. a shooting star)

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PTYS/ASTR 206 Asteroids/Meteorites 4/17/07 1. How were asteroids discovered? 1. What is their origin? 2. What do they look like? 3. What are near-Earth asteroids? 4. What happens when an asteroid intersects Earth? Asteroids (starlike) Ceres , the largest asteroid in the asteroid belt
PTYS/ASTR 206 Asteroids/Meteorites 4/17/07 Recall Bode’s Law As we discussed previously, Bode’s law is mathematical representation of the semi-major axis of each planet Not a scientific “law” in the usual sense Start with the simple sequence 0 3 6 12 24 48 96 192 384 Then Add 4 4 7 10 16 28 52 100 196 388 Then divide by 10 0.4 0.7 1.0 1.6 2.8 5.2 10.0 19.2 38.8

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PTYS/ASTR 206 Asteroids/Meteorites 4/17/07 Bodes Law prediction vs. actual (semi-major axis in AU) OBJECT PREDICTED ACTUAL Mercury 0.4 0.39 Venus 0.7 0.72 Earth 1.0 1.0 Mars 1.6 1.52 ??? 2.8 ??? Jupiter 5.2 5.2 Saturn 10 9.5 Uranus 19.6 19.2 Neptune 38.8 30.1 Pluto 78 39.6
PTYS/ASTR 206 Asteroids/Meteorites 4/17/07 Discovery of Ceres Giuseppe Piazzi searched for the missing planet Found Ceres

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PTYS/ASTR 206 Asteroids/Meteorites 4/17/07 Discovery of Ceres Ceres disappeared behind the Sun and then reappeared – just like a planet Ceres is about 2.8 AU from the Sun – just as predicted by Bode’s law However, Ceres looked like a star must be a very small planet ! It turns out that Ceres is smaller than Pluto, but, by far, the largest of the asteroids in the asteroid belt
PTYS/ASTR 206 Asteroids/Meteorites 4/17/07 Soon after Ceres was discovered, other small “planets” were found All about 2.8 AU from the Sun New technique (ca. 1800’s) : Invented by Max Wolfe long-exposure photography Look for asteroid trails on photos

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PTYS/ASTR 206 Asteroids/Meteorites 4/17/07 Soon after Ceres was discovered, other small “planets” were found All about 2.8 AU from the Sun New technique (ca. 1800’s) : Invented by Max Wolfe long-exposure photography Look for asteroid trails on photos Did the Missing Planet Even Exist ?
PTYS/ASTR 206 Asteroids/Meteorites 4/17/07 Discovery of the Asteroid Belt Astronomers were finding many asteroids with the new technique Wolfe alone discovered over 200 Modern Technique CCD images at various

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## This note was uploaded on 01/01/2011 for the course PTYS/ASTR 206 taught by Professor Shanebyrne during the Spring '07 term at Arizona.

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PTYS_411_511_6_Lec24-041707_astroids_meteor - Asteroids and...

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