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Communication Dans Un Congrès Année : 2008

Titania's Radius and an Upper Limit on its Atmosphere from the Sep. 8, 2001 Stellar Occultation

Résumé

On September 8, 2001, the largest of Uranian moons, Titania, occulted V = 7.2, K0 III Hipparcos-catalog star HIP 106829. The star's unusual brightness allowed more than a hundred stations to monitor this unique event over three continents. The main goals of the observations were to (i) determine Titania's radius and possible oblateness ; (ii) determine Titania's offset with respect to the DE405 URA027 ephemeris ; (iii) search for an atmosphere. Our new analysis provides ground pressure upper limits for a Titania's equilibrium atmosphere at typical levels of ~10 nbar. This value, a factor of ~103 less than current atmospheres of Pluto or Triton, is encouraging in the context of search for atmospheric signature in a ground-based stellar occultation by a KBO.
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Dates et versions

hal-03743575 , version 1 (02-08-2022)

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Thomas Widemann, Bruno Sicardy, Emmanuel Lellouch, Jean-Eudes Arlot, François Colas, et al.. Titania's Radius and an Upper Limit on its Atmosphere from the Sep. 8, 2001 Stellar Occultation. European Planetary Science Congress 2008, Sep 2008, Münster, Germany. pp.589. ⟨hal-03743575⟩
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