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PLUTO

PLUTO. Motion and discovery of Pluto. As faint as stars, Pluto is seen to change its position significantly in one day. Pluto by HST. Pluto. Not like a Jovian planet; more like an asteroid, minor planet, or planetesimal  Kuiper Belt Object

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PLUTO

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  1. PLUTO

  2. Motion and discovery of Pluto As faint as stars, Pluto is seen to change its position significantly in one day

  3. Pluto by HST

  4. Pluto • Not like a Jovian planet; more like an asteroid, minor planet, or planetesimal  Kuiper Belt Object • Mass ~ 0.0022 x Earth’s; 6 times lighter than the Moon, but similar size • Though small, Pluto has a moon – Charon; largest satellite/planet ratio (8%, vs. 1% for Earth) • Pluto-Charon as a double planetesimal • Pluto-Charon are tidally locked to each other; both with rotation/revolution period of 6.4 d; face each other all the time • Atmosphere: Gaseous methane, N, CO !! pressure ~ 10-6 bars, T ~ 40 K • Very eccentric orbit; at perihelion Pluto can be closer than Neptune

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