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"NASA Technical Reports Server (NTRS) 20000091008: Pluto And Charon: A Case Of Precession-Orbit Resonance?" and the language of the book is English.


“NASA Technical Reports Server (NTRS) 20000091008: Pluto And Charon: A Case Of Precession-Orbit Resonance?” Metadata:

  • Title: ➤  NASA Technical Reports Server (NTRS) 20000091008: Pluto And Charon: A Case Of Precession-Orbit Resonance?
  • Author: ➤  
  • Language: English

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  • Internet Archive ID: NASA_NTRS_Archive_20000091008

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"NASA Technical Reports Server (NTRS) 20000091008: Pluto And Charon: A Case Of Precession-Orbit Resonance?" Description:

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Pluto may be the only known case of precession-orbit resonance in the solar system. The Pluto-Charon system orbits the Sun with a period of 1 Plutonian year, which is 250.8 Earth years. The observed parameters of the system are such that Charon may cause Pluto to precess with a period near 250.8 Earth years. This gives rise to two possible resonances, heretofore unrecognized. The first is due to Pluto's orbit being highly eccentric, giving solar torques on Charon with a period of 1 Plutonian year. Charon in turn drives Pluto near its precession period. Volatiles, which are expected to shuttle across Pluto's surface between equator and pole as Pluto's obliquity oscillates, might change the planet's dynamical flattening enough so that Pluto crosses the nearby resonance, forcing the planet's equatorial plane to depart from Charon's orbital plane. The mutual tilt can reach as much as 2 deg after integrating over 5.6 x 10(exp 6) years, depending upon how close Pluto is to the resonance and the supply of volatiles. The second resonance is due to the Sun's traveling above and below Charon's orbital plane; it has a period half that of the eccentricity resonance. Reaching this half-Plutonian year resonance requires a much larger but still theoretically possible amount of volatiles. In this case the departure of Charon from an equatorial orbit is about 1 deg after integrating for 5.6 x 10(exp 6) years. The calculations ignore libration and tidal friction. It is not presently known how large the mutual tilt can grow over the age of the solar system, but if it remains only a few degrees, then observing such small angles from a Pluto flyby mission would be difficult. It is not clear why the parameters of the Pluto-Charon system are so close to the eccentricity resonance.

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  • Added Date: 2016-10-18 09:13:37

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