Recent Observations of Plutos System Probing Pluto's Atmosphere, - PowerPoint PPT Presentation

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Recent Observations of Plutos System Probing Pluto's Atmosphere, Charon's Size and Orbital Elements Bruno Sicardy Observatoire de Paris - LESIA & Universit Pierre et Marie Curie ESOP XXXI meeting Pescara 24-27 August 2012

Recent Observations of Pluto’s System Probing Pluto's Atmosphere, Charon's Size and Orbital Elements Bruno Sicardy Observatoire de Paris - LESIA & Université Pierre et Marie Curie ESOP XXXI meeting Pescara 24-27 August 2012
Doressoundiram & Lellouch, "Aux confins du système solaire"
airless Trans-Neptunian Objects (TNO's)  radius, shape & limb features at kilometric accuracy  density, if mass known from satellite motion ---> internal structure  albedo ---> composition, state of surface  if double occultation primary/secondary: accuracy ~ 10 km, e.g. Pluton/Charon ---> better orbital elements
TNO's with atmosphere  density & temperature profiles down to nbar levels  variations with time  detection of activity ( e.g. gravity waves)  zonal winds measurements through central flash  haze properties through chromatic dependence
Geometry of the double occultation 22 June 2008
circumstances of the double occultation of 04 June 2011: Charon
circumstances of the double occultation of 04 June 2011: Pluto
the double Pluto/Charon event 4 June 2011, S. America Charon/airless Pluto/atmosphere San Pedro de Atacama/Chile 50cm Pico dos Dias/Brazil 160cm La Silla/Chile 60cm Santa Martina/Santiago/Chile 40cm
the double occultation of 04 June 2011: Charon R= 602.0 km (vs. 603.6 km in 2005)
JPL #017 Tholen et al. 2008 HST-based Sicardy et al. 2011 Buie et al 2012 HST-based
PrePredicted ~ one week before
Observed
Pluto stellar occultation, 18 july 2012 ESO Very Large Telescope, NACO, H band Pluto’s motion Pluto Charon star before the event, without AO star Pluto Charon after the event, with AO
gravity waves
AAT 12 June 2006 summer winter VLT 18 July 2012

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