000004601 001__ 4601
000004601 005__ 20200124121343.0
000004601 037__ $$aPOSTER-2020-0027
000004601 100__ $$aKosov, Alexander
000004601 245__ $$aLaRa (Lander Radioscience) on the ExoMars 2020 Kazachok lander
000004601 260__ $$c2019
000004601 269__ $$c2019-10-07
000004601 520__ $$aThe  LaRa  (Lander  Radioscience)  experiment  is  designed  to  obtain  coher-ent   two-way   Doppler   measurements   from   the   radio   link   between   the  2020 ExoMars lander (the Kazachok surface platform) and Earth during at least one Martian year. The Doppler shifts are measured by comparing the frequency of the radio signal received from LaRa with the known frequency of a ground-based reference signal. Transmitting signals from Earth to Mars and  back  again  is  called  two-way  communication  and  greatly  enhances  the  accuracy  of  the  radio  experiment.  The  Doppler  measurements  are  used  to  determine  the  orientation  and  rotation  of  Mars  in  space  (precession,  nuta-tions, and length-of-day variations), as well as polar motion, more accurately than  ever  before.  The  LaRa  transponder  is  designed  to  maintain  the  phase  coherency  of  the  signal,  and  the  global  precision  on  the  Doppler  measure-ments is expected to be better than 0.1 mm/s for a 60-second integration time (compared  to  instrument  precision  requirements  at  the  level  of  0.02  mm/s  for a 60-second integration time). The final objective is to obtain new infor-mation and constraints on the interior of Mars, and on the sublimation and condensation  cycle  of  atmospheric  CO2.  Rotational  variations  will  allow  us  to constrain the moments of inertia of the whole planet, including its mantle and  core,  moments  of  inertia  of  the  core  only,  and  seasonal  mass  transfer  between  the  atmosphere  and  ice  caps.  The  LaRa  experiment  will  be  com-bined  with  other  ExoMars  experiments  in  order  to  retrieve  a  maximum  amount of information. We will also combine LaRa’s Doppler measurements with  similar  data  from  the  Viking  landers,  Mars  Pathfinder,  Mars  Explora-tion Rovers, and the ongoing InSight/RISE mission, will provide information on the interior of Mars with unprecedented accuracy, improving our under-standing of the formation and evolution of the Red Planet.
000004601 536__ $$aESA/$$cPRODEX/$$fPlanetInt ESA/PRODEX/LaRa
000004601 594__ $$aNO
000004601 700__ $$aDehant, Véronique
000004601 700__ $$aLe Maistre, Sébastien
000004601 700__ $$aYseboodt, Marie
000004601 700__ $$aBaland, Rose-Marie
000004601 700__ $$aKaratekin, Ozgur
000004601 700__ $$aPéters, Marie-Julie
000004601 700__ $$aRivoldini, Attilio
000004601 700__ $$aVan Hoolst, Tim
000004601 700__ $$aVan Hove, Bart
000004601 700__ $$aLaRa team, and the
000004601 773__ $$tPoster presented at Tenth Moscow International Solar System Symposium (10M-S3), Space Research Institute(IKI), Moscow, Russia. on 2019-10-07
000004601 8560_ $$frose-marie.baland@observatoire.be
000004601 85642 $$ahttps://ms2019.cosmos.ru/docs/10m-s3-abstract-book.pdf
000004601 980__ $$aCPOSTER