Neptune - Neptune IntroductionandGeneralProperties...

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Neptune Introduction and General Properties  discovered in 1840s knew very little before August, 1989 . . . . . . (Voyager 2) similar in size to Uranus albedo = 0.62 . . . . cloud covered density = 1.6 g/cm 3 => more like gas or liquid Motions orbit: orbital period = 165 years orbits 30 AU from the Sun rotation: rotation period = 16 hours o fast Interior observe weak magnetic field since it rotates, expect some liquid inside magnetic axis is tilted a lot from rotation axis - like Uranus   Internal structure (similar to Uranus):
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higly differentiated heat source inside possibly left over heat from formation (?) Atmosphere Composition: (from spectroscopy) hydrogen helium methane o reflects blue light, absorbs red light o gives Neptune blue color     warmer than Uranus from internal heat source Ciculation from: convection o mainly from internal heat source rotation see belts and zones - somwhat more obvious than on Uranus
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Neptune - Neptune IntroductionandGeneralProperties...

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