Pluto: Discovered by Clyde Tombaugh 1930 Pluto orbits the Sun on an elliptical path, tilted 17 degrees from the ecliptic plane, between 30 and 50 AU Pluto’s.

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Presentation transcript:

Pluto: Discovered by Clyde Tombaugh 1930 Pluto orbits the Sun on an elliptical path, tilted 17 degrees from the ecliptic plane, between 30 and 50 AU Pluto’s orbital period = 248 years. Perihelion was Sept. 1989

Because Pluto is sometimes closer to the Sun than Neptune, some people thought it might be an escaped moon of Neptune. Looking down on the solar system - the orbits of the outer planets Keeping Neptune fixed and watching the paths of the other planets for millions of years But orbital calculations show that Pluto and Neptune’s orbits are in a 3:2 resonance - they dance together - but never get close. Pluto now Neptune fixed

1975 Detection of surface ices: CH 4, N 2, CO Implied possible sublimation atmosphere With strong seasonal changes over 248 year orbit

Temperature: 40 Kelvin = -233 C = -340 F Reddish color and strong albedo variations

Hubble’s Best Picture Smoothed and modeled image 1988 Stellar occultation by Pluto Gradual decrease in starlight -> atmosphere Po~3 nanobar, T~50K