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Lecture 12

Astronomy 2232F/G Lecture 12: Week 6 - Uranus
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Department
Astronomy
Course Code
Astronomy 2232F/G
Professor
Gordon Osinski

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Description
Distance from Sun 2.871 x 109 km (19.189 AU) Radius 25,362 km Mass 8.681 x 102 S kg Density 1.270 g/cm3 Surface gravity 8.87 m/s2 Escape velocity 21,380 m/s Axial tilt 97.8° on period (retrograde) 17.240 hours Orbital period 84.017 Earth years Number of moons 27 known CPSX Hydrogen, helium, and trace ga ce (H2O, CH4, NH.) or ice-rock Silicate rock rich in iron and magnesium Distance from Sun 2.871 x 109 km (19.189 AU) Radius 25,362 km Mass 8.681 x 102 S kg Density 1.270 g/cm3 Surface gravity 8.87 m/s2 Escape velocity 21,380 m/s Axial tilt 97.8° on period (retrograde) 17.240 hours Orbital period 84.017 Earth years Number of moons 27 known CPSX Hydrogen, helium, and trace ga ce (H2O, CH4, NH.) or ice-rock Silicate rock rich in iron and magnesium Uranus • 7 planet from the Sun • Ice giant • Axis of rotation is tilted almost parallel to orbital plane – horizontal not vertical like other planets o May be result of collision with another body Discovery • William Herschel • March 13, 1781 Greek mythology – god of the sky • Father of Cronus (Saturn) • First ruler of the Gods • Roman counterpart: Caelus – only planet named after Greek, not Roman mythology Exploration Voyager 2 (1977) • Only spacecraft to visit Uranus • Only 5 ½ hours of close study • Discovered 10 new satellites, two new rings • Closest approach January 24, 1986 Internal Structure Suspected structure Atmosphere • Featureless blue-green ball o Hydrogen (74%) and helium (26%) with trace amounts of C
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