Q - Physics
Q - Physics
Q - Physics
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7 - Comets and<br />
Solar System Dust
Oort Cloud & Kuiper Belt<br />
View from the Kuiper Belt<br />
(artist’s conception)
Solar System Dust<br />
(a “grownup” solar system - OURS)
Comet NEAT 2002 V1
Thank you Alan & Bill!<br />
Comet Kudo-<br />
Fujikawa
⎛<br />
⎜<br />
⎝<br />
Equilibrium Temperature for a<br />
Single Grain:<br />
L star<br />
4πr 2<br />
⎞<br />
⎟ πa2<br />
⎠<br />
( ) Q vis<br />
E in<br />
= E out<br />
( ) = 4πa 2<br />
( )( σT 4<br />
) Q IR<br />
( )<br />
T = 1 r<br />
⎛<br />
⎜<br />
⎝ 16πσ<br />
L star<br />
Q vis<br />
Q IR<br />
⎞<br />
⎟<br />
⎠<br />
1<br />
4<br />
K<br />
For the case where L=L Sun<br />
and Measuring r in AU:<br />
T = 278.3<br />
r AU<br />
⎛<br />
⎜<br />
⎝<br />
Q vis<br />
Q IR<br />
⎞<br />
⎟<br />
⎠<br />
1<br />
4
Q abs<br />
8πa<br />
λ Im ⎧⎪<br />
m2 λ<br />
⎨<br />
⎩⎪ m 2 λ<br />
( ) − 1<br />
( ) + 2<br />
⎫⎪<br />
⎬<br />
⎭⎪<br />
∝ λ −1 for m,a const<br />
( )<br />
Q abs<br />
λ −2 good approx Q abs<br />
λ 0 , BB, fails at long λ!
Mg 2<br />
SiO 4
Interplanetary Dust Particles
Wooden et al. (2000) fit Hale-Bopp with IDP spectra
Deep Impact - July 4, 2005
Deep Impact
Deep Impact
73P/Schwassmann-Wachmann 3
THE END (for now…)
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