Charon's radius and atmospheric constraints from observations of a stellar occultation

Details Charon's radius and atmospheric constraints from observations of a stellar occultation Charon's radius and atmospheric constraints from observations of a stellar occultation

Jan 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006natur.439...48g&link_type=abstract

Nature, Volume 439, Issue 7072, pp. 48-51 (2006).

Physics

24

Scientific paper

The physical characteristics of Pluto and its moon, Charon, provide insight into the evolution of the outer Solar System. Although previous measurements have constrained the masses of these bodies, their radii and densities have remained uncertain. The observation of a stellar occultation by Charon in 1980 established a lower limit on its radius of 600km (ref. 3) (later refined to 601.5km ref. 4) and suggested a possible atmosphere. Subsequent, mutual event modelling yielded a range of 600-650km (ref. 5), corresponding to a density of 1.56 +/- 0.22gcm-3 (refs 2, 5). Here we report multiple-station observations of a stellar occultation by Charon. From these data, we find a mean radius of 606 +/- 8km, a bulk density of 1.72 +/- 0.15gcm-3, and rock-mass fraction 0.63 +/- 0.05. We do not detect a significant atmosphere and place 3σ upper limits on atmospheric number densities for candidate gases. These results seem to be consistent with collisional formation for the Pluto-Charon system in which the precursor objects may have been differentiated, and they leave open the possibility of atmospheric retention by the largest objects in the outer Solar System.

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