000004222 001__ 4222
000004222 005__ 20190514101231.0
000004222 037__ $$aPOSTER-2019-0093
000004222 100__ $$aKosov, Alexander
000004222 245__ $$aLaRa (Lander Radioscience) on the ExoMars 2020 Surface Platform - Rotation of Mars and Positioning of the Surface Platform
000004222 260__ $$c2018
000004222 269__ $$c2018-10-08
000004222 520__ $$aThe LaRa experiment is designed to obtain coherent two-way Doppler meas-urements  from  the  radio  link  between  the  2020  ExoMars  lander  (the  Sur-face Platform, SP) and the Earth over at least one Martian year. The Doppler measurements will be used to observe the orientation and rotation of Mars in space (precession, nutations, and length-of-day variations), as well as polar motion. The ultimate objective is to obtain information on the Martian inte-rior and on the sublimation/condensation cycle of atmospheric CO2.  Rota-tional variations will allow us to constrain the moment of inertia of the entire planet, including its mantle and core, the moment of inertia of the core, and seasonal mass transfer between the atmosphere and the ice caps.Besides, LaRa could allow to accurately determine the position of the SP within a very short time after the starting of operations. An early estimate of the lander location will certainly improve the quality of the science anal-ysis (for instance by making easier the recognition of the geological features seen on the lander’s pictures) and allow high-resolution cameras from space-craft like MRO to correctly target the lander. The classical technique using Delta DOR measurements for obtaining the SP position has an accuracy in the plane of sky of 200-900m (depending on the Earth-Mars distance), while our estimation combining LaRa Doppler data and local terrain maps is about 10 m. Such an early precise estimate of the lander location will also certainly improve the quality of the science analysis.
000004222 594__ $$aNO
000004222 6531_ $$aLaRa
000004222 6531_ $$aMars
000004222 6531_ $$aExoMars 2020
000004222 700__ $$aLe Maistre, Sébastien
000004222 700__ $$aDehant, Véronique
000004222 700__ $$aBaland, Rose-Marie
000004222 700__ $$aKaratekin, Ozgur
000004222 700__ $$aMitrovic, Michel
000004222 700__ $$aPéters, Marie-Julie
000004222 700__ $$aRivoldini, Attilio
000004222 700__ $$aVan Hoolst, Tim
000004222 700__ $$aVan Hove, Bart
000004222 700__ $$aYseboodt, Marie
000004222 773__ $$tNinth Moscow International Solar System Symposium (9M-S3), Space Research Institute(IKI), Moscow, Russia.
000004222 8560_ $$frose-marie.baland@observatoire.be
000004222 85642 $$ahttps://ms2018.cosmos.ru/
000004222 980__ $$aCPOSTER