Current Events Satellite Discoveries

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Current Events - Satellite Discoveries
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Satellites of Uranus Neptune - Outline
Satellites of Uranus Satellites of
Neptune Review of Satellites

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The Planet Uranus
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The Planet Uranus
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The Planet Uranus
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Satellites of Uranus
General Characteristics
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Miranda
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Miranda2
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Miranda3
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Miranda4
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Ariel
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Oberon
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Titania
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Shepherd Satellites
Cordelia and Ophelia
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Farewell Uranus
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The Planet Neptune
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The Planet Neptune
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Satellites of Neptune
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Triton
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Triton
Innermost and largest satellite Big (2700 km),
one of largest in solar system Weird orbit,
inclined and retrograde gt will crash in 10
8years density 2.1 g/cm 3 Methane ice on
surface, gas in atmosphere
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Triton2
Surface "cantelope" terrain very flat
calderas NH 3- H 2O eutectic melt (H 2O melts
200 C higher) mean surface T 38 K (lowest
in S.S.) P 16 x 10 -6 bars (microbars)
Active volcanoes (geysers) observed by Voyager
Young-looking surface (few craters), black
streaks look like "ash" fallout from volcanoes
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Triton3
Size, composition very similar to Pluto (may be
same type object) surface lt 4.5 x 10
9yrs solid state greenhouse N2geysers 8 km
high, 100 km long plumes wind streaks N2frost
at poles covers H 2O ice red color from
organics, energetic CH 4particles one season
40 yrs atmosphere of N 2, CH 4 clouds, haze at
tropopause (25-50 km) either condensation or
surface eruption Triton similar to Pluto gt
capture ?
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Triton Clouds
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Triton4
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Nereid
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Nereid2
Prograde orbit, but very elliptical Much
smaller than Triton Irregular shape Cratered
Poorly imaged Captured? Probably not
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Farewell Neptune
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Overview of Outer Planet Satellites
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General Characteristics of Comets
Nucleus dirty snowball Coma gas and
dust Tail gas and dust Trail larger debris
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Meteor Showers and Comets
First three basic definitions Meteoroid - small
particle in space Meteor - visible display
caused by meteoroid entering the
atmosphere Meteorite - intact object on surface
of Earth A meteor shower occurs when Earth
passes through the debris trail of a comet.
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Different Populations of Comets
Long-Period Comets Short-Period
Comets Kuiper Belt of Comets Oort Cloud of
Comets
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Short-Period and Long-Period Comets
Long-Period Comets (Hale-Bopp) Period gt 200
years Long elliptical orbits, some almost
parabolic Not confined to the ecliptic Short-Per
iod Comets (Halley) Period lt 200
years Elliptical orbits close to the ecliptic
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Reservoirs - Kuiper Belt and Oort Cloud
Kuiper Belt of Comets Disk of comets beyond
the orbit of Neptune Ranges from 30 to 100
AU Oort Cloud of Comets Spherical cloud of
comets Ranges from 50,000 to 100,000 AU (about
half-way to the nearest star) May be several
trillions comets in the Oort cloud.
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THE END
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Cassini Mission