Published on August 29, 2007
Pluto: Pluto The 9th planet? Discovery of the “planet”: Discovery of the 'planet' Perturbation on Uranus’ Orbit? Discovered by Clyde Tombaugh, 6 degrees away from Lowell’s prediction and announced on March 13, 1930. In fact the perturbations do not exist Exotic Orbit Elongated with an e=0.25 (dperihelion = 29.7 AU, daphelion=49.3 AU) Inclined of 17.2 degrees P=248.0 yr -andgt; a 3:2 resonance with Neptune Faint target with a magnitude of 12-14 (need large telescope) Symbols of planets: Symbols of planets Orbit: Orbit Movie! Motion of Pluto: Motion of Pluto Physical Properties: Physical Properties Physical Properties: Physical Properties In 1978, discovery of Charon, satellite of Pluto Prevolution = 6.4 days -andgt; MPluto = 0.0021 Mearth Radius of Pluto estimated by eclipse event tidally locked (Prevolution = Protation), by surface brightness variation Dpluto = 2270 km (same as Triton) Density = 2.1 g/cm3 (same as Triton) Dcharon= 1300 km (Mass ratio = 1/6) Distance = 19,700 km Orbit inclined by 118 degree (Retrograde spinning orbit) Slide8: Eclipses: Eclipses Pluto-Charon Orbit: Pluto-Charon Orbit Discovery of Pluto atmosphere: Discovery of Pluto atmosphere Interior of Pluto and Charon: Interior of Pluto and Charon Surface of Pluto/Charon: Surface of Pluto/Charon movie Science highlights: Science highlights Slide15: Mission to Pluto-Charon New Horizon: Mission to Pluto-Charon New Horizon Slide17: Slide18: Slide19: Outer bodies in the Solar System: Outer bodies in the Solar System What is a planet?: What is a planet?