000003892 001__ 3892
000003892 005__ 20190125122602.0
000003892 0247_ $$2DOI$$a10.1016/j.pss.2017.05.008
000003892 037__ $$aSCART-2019-0065
000003892 100__ $$aYseboodt, Marie
000003892 245__ $$aSignatures of the Martian rotation parameters in the Doppler and range observables
000003892 260__ $$c2017
000003892 520__ $$aThe position of a Martian lander is affected by different aspects of Mars' rotational motions: the nutations, the precession, the length-of-day variations and the polar motion. These various motions have a different signature in a Doppler observable between the Earth and a lander on Mars' surface. Knowing the correlations between these signatures and the moments when these signatures are not null during one day or on a longer timescale is important to identify strategies that maximize the geophysical return of observations with a geodesy experiment, in particular for the ones on-board the future NASA InSight or ESA-Roscosmos ExoMars2020 missions. We provide first-order formulations of the signature of the rotation parameters in the Doppler and range observables. These expressions are functions of the diurnal rotation of Mars, the lander position, the planet radius and the rotation parameter. Additionally, the nutation signature in the Doppler observable is proportional to the Earth declination with respect to Mars. For a lander on Mars close to the equator, the motions with the largest signature in the Doppler observable are due to the length-of-day variations, the precession rate and the rigid nutations. The polar motion and the liquid core signatures have a much smaller amplitude. For a lander closer to the pole, the polar motion signature is enhanced while the other signatures decrease. We also numerically evaluate the amplitudes of the rotation parameters signature in the Doppler observable for landers on other planets or moons.
000003892 536__ $$aPRODEX/$$cPRODEX/$$fPRODEX
000003892 594__ $$aNO
000003892 700__ $$aDehant, Véronique
000003892 700__ $$aPéters, Marie-Julie
000003892 773__ $$pPlanetary and Space Science$$v144$$y2017
000003892 8560_ $$fmarie.yseboodt@observatoire.be
000003892 85642 $$ahttps://arxiv.org/abs/1611.09040
000003892 905__ $$apublished in
000003892 980__ $$aREFERD