000004597 001__ 4597
000004597 005__ 20200124112827.0
000004597 037__ $$aPOSTER-2020-0024
000004597 100__ $$aCoyette, Alexis
000004597 245__ $$aPossible observations of Length-of-day Variations of Titan from Cassinidata between 2004 and 2009
000004597 260__ $$c2019
000004597 269__ $$c2019-04-11
000004597 520__ $$aThe  determination  of  rotation  variations  of  Titan  is  based  on  measurements  of  the  shift  in  orientation  ofCassini  RADAR  images  taken  different  flybys.  Between  2004  and  2009,  these  images  have  shown  that  Titanwas  rotating  slower  than  expected  for  a  satellite  in  synchronous  rotation  (non-synchronous  rotation  (NSR)  of-0.024±0.018◦/year, Meriggiola et al., 2016).We  here  model  the  rotation  of  Titan  from  the  angular  momentum  equations  (or  Liouville  equations)  of  thedifferent interior layers of Titan. Our model includes the effect of tidal deformations of the different layers, of thedeviation from the hydrostatic equilibrium, of the dense atmosphere of Titan and of the flow in the subsurfaceocean on the rotation of Titan.Our  results  (published  in  Coyette  et  al.,  2018)  show  that  length-of-day  variations  with  a  period  of  a  fewyears and due to angular momentum exchanges between Titan and its atmosphere can be large enough to explainthe  observed  deviation  from  synchronous  rotation.  This  observed  NSR  could  therefore  be  interpreted  as  anobservation  of  the  length-of-day  variations  of  Titan  in  that  period  of  time.  If  our  interpretation  is  correct,  weexpect a rotation faster than the synchronous rotation rate between 2009 and 2014, period of time that has notbeen studied yet.
000004597 536__ $$aESA/$$cPRODEX/$$fPlanetInt
000004597 594__ $$aNO
000004597 700__ $$aBaland, Rose-Marie
000004597 700__ $$aVan Hoolst, Tim
000004597 773__ $$tEGU General Assembly, EGU2019, 7-19 April, 2019 in Vienna, Austria
000004597 8560_ $$frose-marie.baland@observatoire.be
000004597 85642 $$ahttps://meetingorganizer.copernicus.org/EGU2019/EGU2019-14355.pdf
000004597 980__ $$aCPOSTER