ch 13 -uranus
TRANSCRIPT
Stats• Sidereal year: 84 Earth Years
Orbits with equator at gravity:
90 degrees to 8.69 m/s2
its path around
the sun.
sidereal day:
-.718 days
(retrograde)
Mass: 8.68E25 kg,
Radius: 25,362 km
Core
inner coresilicate/Iron-Nickelrock
Mantle: waterammonia, methane ices
Rest is gaseous hydrogen, helium, methane
Upper Atmosphere
• Atmosphere: Hydrogen, Helium, small amount of Methane
• Ice Giant: Known as the
• coldest planet
• Made of icy materials,
• water, methane and ammonia
Mass: 8.68E25 kg, Radius: 25,362 km
Inclination
• First: Remember that Uranus orbits with its poles facing the sun and opposite the sun. 98 degree tilt.
When the North Pole faces the sun then for 42 years there is daylight and 42 years there is night.
Eccentricity
• e = .047
• Also: Uranus has a retrograde rotation.
• The best information: http://www.newtonsapple.org.uk/uranus-planet-of-diamonds/
• It is tipped 60 degrees with respect to the axis of rotation
• It is so skewed that it winds up like a corkscrew as Uranus rotates.
• This is known by radio
• bursts from Uranus every
• 17.24 hours. These apparently come from locations in Uranus’s interior.
Magnetic Field
Rings
• Yes, Uranus has ringsDiscovered byAussies whenthey noticedstars blinking. It was the rings interfering withtheir view. picturefrom Voyager 2. White marksare dust particles
The Color is really Blue
• The atmosphere of Methane absorbs the red wavelengths of light and prevents it from bouncing back.
• All we can see is the blue-green photons reflected into space.
• This is the coldest planet of all.
More Fun Facts
• Second least dense planet to Saturn
• Has rings that are visible with a backyard telescope. They are dark and only a few km wide.
• First planet discovered after the invention of the telescope.
• Can see Uranus without a telescope.
Titaniafeatures: frost, maybe
tectonics, very gray like mostUranianMoons.Sidereal Year:8.76 Earth days.
Miranda
This photo is a montage.
https://solarsystem.nasa.gov/planets/profile.cfm?Object=Ura_Miranda
1.4 Earth days toorbitSmallest ofthe top five andclosest to the planet.
Other moons
• https://solarsystem.nasa.gov/planets/profile.cfm?Object=Uranus&Display=Sats
Some websites for Uranus
• http://www.seasky.org/solar-system/uranus.html