Charon's radius and density from the combined data sets of the 2005 July 11 occultation

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dc.creatorPerson, M. J.
dc.creatorElliot, J. L.
dc.creatorGulbis, A. A. S.
dc.creatorPasachoff, J. M.
dc.creatorBabcock, B. A.
dc.creatorSouza, S. P.
dc.creatorGangestad, J.
dc.date2006-02-03
dc.date.accessioned2026-07-07T11:25:14Z
dc.date.available2026-07-07T11:25:14Z
dc.descriptionThe 2005 July 11 C313.2 stellar occultation by Charon was observed by three separate research groups, including our own, at observatories throughout South America. Here, the published timings from the three data sets have been combined to more accurately determine the mean radius of Charon: 606.0 +/- 1.5 km. Our analysis indicates that a slight oblateness in the body (0.006 +/- 0.003) best matches the data, with a confidence level of 86%. The oblateness has a pole position angle of 71.4 deg +/- 10.4 deg and is consistent with Charon's pole position angle of 67 deg. Charon's mean radius corresponds to a bulk density of 1.63 +/- 0.07 g/cm3, which is significantly less than Pluto's (1.92 +/- 0.12 g/cm3). This density differential favors an impact formation scenario for the system in which at least one of the impactors was differentiated. Finally, unexplained differences between chord timings measured at Cerro Pachon and the rest of the data set could be indicative of a depression as deep as 7 km on Charon's limb.
dc.description25 pages including 4 tables and 2 figures. Submitted to the Astronomical Journal on 2006 Feb 03
dc.identifierhttps://arxiv.org/abs/astro-ph/0602082
dc.identifierhttp://arxiv.org/abs/astro-ph/0602082
dc.identifierAstron.J.132:1575-1580,2006
dc.identifierdoi:10.1086/507330
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/195448
dc.subjectAstrophysics
dc.titleCharon's radius and density from the combined data sets of the 2005 July 11 occultation
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