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

  title={Charon's size and an upper limit on its atmosphere from a stellar occultation},
  author={Bruno Sicardy and A. Bellucci and Eric Gendron and François Lacombe and Ste phanie P. Lacour and J. J. Lecacheux and Emmanuel Lellouch and Scott Renner and Sylvain Pau and Françoise Roques and Thomas Widemann and Florent Colas and Fr{\'e}d{\'e}ric Vachier and Roberto Vieira Martins and Nancy Ageorges and Olivier R. Hainaut and Olivier Marco and Wolfgang Beisker and Edsko Hummel and Carlos Feinstein and H. Levato and Anaelle J. Maury and E. Frappa and Boris Gaillard and Maylis Lavayssi{\`e}re and Mario di Sora and Franco Mallia and Gianluca de Masi and Raoul Behrend and Fabien Carrier and Oliver Mousis and Philippe Rousselot and Alvaro Alvarez-Candal and D Lazzaro and C. H. Veiga and Alexandre Humberto Andrei and Marcelo Assafin and Dario N. da Silva Neto and Charles Jacques and Ernesto Pimentel and D. Weaver and J. F. Lecampion and Fredy Doncel and Takashi Momiyama and Gonzalo Tancredi},
Pluto and its satellite, Charon (discovered in 1978; ref. 1), appear to form a double planet, rather than a hierarchical planet/satellite couple. Charon is about half Pluto's size and about one-eighth its mass. The precise radii of Pluto and Charon have remained uncertain, leading to large uncertainties on their densities. Although stellar occultations by Charon are in principle a powerful way of measuring its size, they are rare, as the satellite subtends less than 0.3 microradians (0.06… 
An exploration of Pluto’s environment through stellar occultations
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The 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
Pluto and its main satellite, Charon, occulted the same star on 2008 June 22. This event was observed from Australia and La Réunion Island, providing the east and north Charon Plutocentric offset in
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