A new determination of radii and limb parameters for Pluto and Charon from mutual event lightcurves

  title={A new determination of radii and limb parameters for Pluto and Charon from mutual event lightcurves},
  author={Eliot F. Young and Richard P. Binzel},
Abstract Over the past several years Pluto-Charon mutual events have yielded progressively more accurate estimates of Charon's orbital elements and the radii of Pluto and Charon (e.g., Buie, Tholen, and Horne, 1992, Icarus 97, 211-227). Analysis of the 1988 stellar occultation by Pluto indicates a radius for Pluto that is about 4%, or 50 km+, larger than the mutual event radius of 1151 km. One possible explanation for the discrepancy is that the mutual event modeling treats Pluto and Charon as… 

Charon's size and an upper limit on its atmosphere from a stellar occultation

Observations from a multi-station stellar occultation by Charon are reported, which are used to derive the radius of Pluto and Charon, RC = 603.6 ± 1.4 km (1σ), and the density of ρ = 1.71 ± 0.08 g cm-3.3 (3σ) nanobar, assuming respectively a pure nitrogen or pure methane atmosphere.

The Orbit of Charon

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Charon’s Radius and Density from the Combined Data Sets of the 2005 July 11 Occultation

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The observation of a multi-chord stellar occultation by Eris on 6 November 2010 is reported, consistent with a spherical shape for Eris, and it is anticipated that this atmosphere may periodically sublimate as Eris approaches its perihelion, at 37.8 astronomical units from the Sun.

Bulk Properties and Atmospheric Structure of Pluto and Charon.

We present three observational programs to investigate Pluto's atmospheric structure and the bulk properties of Pluto and Charon: (i) astrometry of the motions of Pluto and Charon around the system

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