Title: Obliquity 23O 3O27O 98O 30O
1Obliquity 23O 3O 27O 98O 30O Mag Axis
12O -10O -0O -59O -47O
2jovians
primarily hydrogen secondarily helium
3H2
H/-
4Jupiter
5Jupiter
6Saturn
7Saturn
8Saturns Icy Rings
9(No Transcript)
10Uranus
11Neptune
12Uranus
13(No Transcript)
14Occultation
15 Io Europa Ganymede Callisto
16Four Body Resonance What causes
resonances? differential gravity tidal
friction tidal evolution requires a lot of
time They have been orbiting Jupiter for a
very long time. not captured
synchronous rotation
Europa 84 hrs
21
Io 42 hrs
73
21
Ganymede 168 hrs
Callisto 392 hrs
17Io
18Io
19Io
20Europa
21Europa
22Europa
23Europa
icy surface high density rocky interior
tidal heating from Io volcanic vents warm
ocean life?
smooth surface liquid ocean
24Tidal Heating
Io passes Europa. Then they pull the other way.
Moons distorted by differential
gravity. Synchronous Rotation
Stresses on Moons Try to Break Synchronous
Rotation
Io gains on Europa. Gravities become important as
they get closer.
25Tidal Heating
plasma torus
volcanic activity
magnetic field tilted 10º rotation wobbling
magnet induces electric current
synchrotron radiation deadly levels
26Ganymede
27Callisto
28Callisto
29(No Transcript)
30Titan
looks bigger atmosphere hydrocarbon haze methane
ocean? methane icebergs? fuel? oxygen spark
31Titan
32(No Transcript)
33Titan
34Titan
35(No Transcript)
36three body systems
very complex special three body
systems Lagrange two massive bodies third
body low mass same orbital period
cant just put it 1au from sun suns gravity
Earths gravity always same direction unstable
37three body systems
L1
38(No Transcript)
39(No Transcript)
40Mimas
41Miranda
42Miranda
43Triton