Titan 21 October 2011. Titan [2003] Second-largest moon in SS Density ~1900 kg/m 3 thick atmosphere! Sublimation N 2 (90%), methane, ethane ethane may.

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Presentation transcript:

Titan 21 October 2011

Titan [2003] Second-largest moon in SS Density ~1900 kg/m 3 thick atmosphere! Sublimation N 2 (90%), methane, ethane ethane may condense clouds, rain,oceans/lakes/ponds/erosion ??? Geology unknown due to thick atmosphere Voyager 1981

Titan [2005] Thick Atmosphere N 2 (90%), methane, ethane methane clouds, rain, lakes Geology Erosion!!!!!!!!!! Volcanism, Tectonics A few impact craters

Huygens Landing Site Rounded cobbles resemble Mars

Titan’s Lakes Of methane mostly (& ethane) Few 100m deep Red areas are those that changed between images a year apart Blue appeared

solid vs. liquid False Color - Radar Reflectivity

North pole 20 times larger area of lakes than south pole Why? Seasonal – north pole was winter releases/2009/11/ htm

Cassini Radar images Lakes- high latitudes 440 km impact crater Minerva Braided channels – floods? Linear dunes near equator

Geology 25 km 440 km diameter Impact Crater Dune Field Cryovolcanic Extrusion ? Cryovolcanism Impact cratering Dune field formation

Atmospheric pressure at surface ~1.5 bars Upper haze layers Photochemical smog Temps ~80-90K = -300 F

Surface Chemistry and interaction with the atmosphere Ices + Liquids + Aerosol Precipitates

Methane rain Titan has a "hydrological cycle" like Earth but with methane instead of water!

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