Transcript Document 7283456

Starting Line
1. turn in Homework #1
2. book check
3. topic selections
Asteroids 2003
semimajor axis
Asteroids 2003
semimajor axis
Asteroids 2009
semimajor axis
Jupiter
Trojan
Asteroids
Lagrangian Points
where objects feel no net force in rotating frame: gravitational force
of two masses cancels centrifugal force because of rotation
5 per two body system
Trojan asteroids at Jupiter (~3000), Mars (4), Neptune (6)
small moons at Sat/Tethys (Telesto+Calypso) and Sat/Dione(Helene+Polydeuces)
Earth orbiting spacecraft
SOHO
WMAP
KBOs and
Comets 2003
KBOs
red: classical KBOs
white: Plutinos
magenta: scattered disk
orange tri: Centaurs
cyan tri: “unusual”
COMETS
solid blue sqr: numbered
open blue squ: others
KBOs and
Comets 2009
KBOs
red: classical KBOs
white: Plutinos
magenta: scattered disk
orange tri: Centaurs
cyan tri: “unusual”
COMETS
solid blue sqr: numbered
open blue squ: others
KBOs and
Comets 2009
Plutinos/TNOs
1093 known
Pluto
Quaoar
Ixion
Varuna
Orcus
Centaurs/SDOs
242 known
Chiron
Sedna
Nessus
Asbolus
Eris
TNOs/SDOs and Friends
Hydra
Nix
Pluto Has 3 Moons!
The “New” Solar System
KBO
Plutino
Dwarf Planet
Plutoid
but wait, there’s more …
Eri
s
The Outer Limits
Hyakutake and Hale-Bopp
Comet SOHO-6
Asteroids, KBOs, Oort Cloud
Orbital a
Orbital e
Orbital i
Composition
Asteroid Belt
Kuiper Belt
Oort Cloud
2.1 – 3.3 AU
0.0 – 0.4
low
rocky
30 – 100+ AU
medium
medium
rocky/icy
~ 50,000 AU
nearly 1.0
any!
icy/dusty
Comet Exploration
Exploration
Halley
Tempel 1
Wild 2
Giotto, Vega
Deep Impact … dropped a bullet
Stardust … sample return
Comet Damage
Comet Damage
Comet Damage: Tunguska 1908
Asteroids … Bye Bye Dinosaurs
65 million years ago
Game Over?
Location, Location, Location
Jovians Good or Bad?
Disk: Protostellar or Debris?
Fomalhaut Planet
QuickTime™ and a
decompressor
are needed to see this picture.
background star
movie
Homework #2
Calculate the space densities in units of #objects
per cubic km of Main Belt asteroids, KBOs, and
Oort Cloud comets. Assume the following:
a. Asteroid Main Belt is a disk containing 106 objects
stretches from 2 AU to 3 AU and is 1 AU thick
b. Kuiper Belt is a disk containing 105 objects
stretches from 30 AU to 100 AU and is 10 AU thick
c. Oort Cloud is a sphere containing 1012 objects
stretches from 20,000 AU to 100,000 AU
DUE THURSDAY, JANUARY 22