Sensitivity analysis of polar orbiter motion to lunar viscoelastic tidal deformation
Xuanyu Hu (Technical University of Berlin)
Alexander Stark (Deutsches Zentrum für Luft- und Raumfahrt (DLR))
Dominic Dirkx (TU Delft - Astrodynamics & Space Missions)
Hauke Hussmann (Deutsches Zentrum für Luft- und Raumfahrt (DLR))
Agnès Fienga (Université Côte d'Azur)
Arthur Briaud (Université Côte d'Azur)
Anthony Mémin (Université Côte d'Azur)
Daniele Melini (Istituto Nazionale di Geofisica e Vulcanologia, Rome)
Marie Fayolle (TU Delft - Astrodynamics & Space Missions)
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Abstract
We investigate the impact of viscoelastic tidal deformation of the Moon on the motion of a polar orbiter. The dissipative effects in the Moon’s interior, i.e., tidal phase lags, are modeled as Fourier series sampled at given frequencies associated with linear combinations of Delaunay arguments, the fundamental parameters describing the lunar motion around the Earth and the Sun. We implement the tidal model to evaluate the temporal lunar gravity field and the induced perturbation on the orbiter. We validate the numerical scheme via a frequency analysis of the perturbed orbital motion. We show that, in the case of the Lunar Reconnaissance Orbiter at a low altitude of less than 200 km, the main lunar tides and hence the potential Love numbers around the monthly and some multiple frequencies are dynamically separable. The omission of those effects in practice introduces a position error at the level of a few decimeters within 10 days.
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