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Uranus PowerPoint PPT Presentation

Uranus Brief History 7 th Planet from the Sun 3 rd largest planet by mass Named after the ancient Greek god for Heaven Discovered in 1781 by William Herschel Visited by Voyager 2 on January 24, 1986 Statistics Distance from Sun: 2.87 billions kilometers; 19.22 AU

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Uranus

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Uranus l.jpg

Uranus


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Brief History

  • 7th Planet from the Sun

  • 3rd largest planet by mass

  • Named after the ancient Greek god for Heaven

  • Discovered in 1781 by William Herschel

  • Visited by Voyager 2 on January 24, 1986


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Statistics

  • Distance from Sun: 2.87 billions kilometers; 19.22 AU

  • Diameter: 51,118 km; 4.01 Earth Diameters

  • Mass: 8.683e25 kg; 14.535 Earth Mass

  • Satellites: 21 named moons and 6 unnamed moons

  • Composition: mostly rock and ice; only about 15% Hydrogen

  • Atmosphere: 83% Hydrogen

    • 15% Helium

    • 2% Methane


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Statistics

  • Orbit around sun: 84.01 earth years

  • Day: 17 hours 14 minutes

  • Color: Blue-green color; due to Methane gas in the upper atmosphere which absorbs red light

  • Density: 1.2 g/cm3

  • Albedo: 0.35


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Internal Structure

  • Similar to Neptune’s

  • Outer envelop: hydrogen, helium and methane about the mass of 1-2 earths

  • Mantle: water, methane, and ammonia under high pressure and temperature, about 10-15 earth masses

  • Core: rock and ice, about 1 earth mass


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Uranus’ Rings

  • First 9 rings discovered in 1977

  • 11 known rings

  • Very dark and faint

  • Outermost rings is the brightest: Epsilon

  • Composed of fine dust to large particles of ice boulders up to 10 meters in diameter

  • Most rings 2-12 km across


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Uranus Rings

  • Shepherd moons keep the dust in rings

  • Without the moons’ gravity the rings would spread apart until they disappeared


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Uranus’ Moons

  • 21 named moons and 6 unnamed moons

  • Named after writings of Shakespeare and Pope

  • Mostly circular orbits except outermost four, which are much more elliptical

  • 3 distinct classes: 11 small, dark inner moons

    5 large moons Newly discovered further out moons


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Titania

  • Largest moon

  • Radius: 788 km

  • Mass: 3.49e21 kg

  • Distance from Uranus: 435,840 

  • Density: 1.7 gm/cm3


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Oberon

  • 2nd largest moon

  • Radius: 761.4 km

  • Mass: 3.03e 21 kg

  • Distance from Uranus

    582,600 km

  • Density: 1.64 gm/cm3


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Moon Characteristics

  • Like our own moon

  • Most are covered in craters and trenches

  • A few mountains

  • Icy


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Uranus is Weird

  • Uranus is tipped on its side

  • Result of a planetoid colliding with it

  • This causes the magnetic field to be tilted 60 degrees from the planet’s axis of rotation

  • The source of the magnetic field is unknown and the the tail was twisted into a corkscrew by the collision


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Voyager 2

  • Launched on April 20, 1977

  • Passed Uranus on January 24, 1986


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