E2N5_Oct4[1] - Uranus and Neptune The Ice Giants Uranus...

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Uranus and Neptune The Ice Giants
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Uranus
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Neptune
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Discovery History of Ice Giants • Sir William Herschel discovers Uranus by accident in 1781---Frst known human to discover a new planet • ±it Bode ` s law! • Adams and Leverrier independently predict Neptune ` s location based on perturbations to the orbit of Uranus---others challenged Newtonian gravity! • Galle discovers Neptune in 1846
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Uranus ` and Neptune s Fact Sheet Physical properties (relative to Earth): density=0.24;Mass=14.5; Radius=4.0; Gravity 0.8 (100lbs =>080 lbs)---at cloud tops density=0.32;Mass=17.2; Radius=3.9; Gravity 1.2 (100lbs =>120lbs)---at cloud tops Fast Rotation ( retrograde / prograde ): sidereal period is about -17 hr 14 m , 16 hr 7 m Orbital period 83.8 yrs , 163.7 yrs Distance from Sun : 19.5 AU , 30.1 AU (semi-major axis) Many moons Complex Rings icy large particles, replenished? B-±eld : large
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Schematic representing interiors of both Uranus and Neptune
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Interiors of Giant Planets
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Uranus ` crazy tilt
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An orbit for Uranus
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Infrared images of Uranus
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Portion of Uranus ` Rings and 2 Shepherd Satellites
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Rings of Neptune
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Uranus ` Moons • Titania at 1580 km is largest of 5 moons, known prior toVoyager 2 encounters in 1985 and 1986; Icy moons with densities only 1.5 times that of water • Others 10 are moonlets like Saturn ` s inner moon – Small rocklike: little is known about these
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Uranus ` largest Moon Titania 1580 km icy surface
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Uranus ` Miranda 470 km
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Neptune ` s Moons • Triton and others; Triton one of most intersting in SS. Nitrogen and Methane in all three states; water ice also present • Others fall into two groups – Small rocklike: little is known about these – Intermediate between Galilean and smaller moons of Jupiter. Low density, lots of water ice.
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Triton Neptune ` s Erupting Moon Another chance for Life ?
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Voyager 2 proves Triton ` s atmosphere
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Triton and its Atmosphere • Larger than Pluto • Circular orbit, but retrograde—formed elsewhere but captured while still warm? • Dense
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This note was uploaded on 11/27/2011 for the course AST 301 taught by Professor Harvey during the Spring '07 term at University of Texas.

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E2N5_Oct4[1] - Uranus and Neptune The Ice Giants Uranus...

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