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Numerical modeling of lander interaction with a low-gravity Asteroid regolith surface: application to MASCOT onboard Hayabusa2

Thuillet, Florian and Michel, Patrick and Maurel, Clara and Ballouz, Ronald-Louis and Zhang, Yun and Richardson, Derek C. and Biele, Jens and Tatsumi, Eri and Sugita, S. (2018) Numerical modeling of lander interaction with a low-gravity Asteroid regolith surface: application to MASCOT onboard Hayabusa2. Astronomy and Astrophysics, 615 (A41). EDP Sciences. ISSN 0004-6361

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Official URL: https://doi.org/10.1051/0004-6361/201832779


Context. Landing on the surface of small bodies is particularly challenging, as the physical properties of the surface material are not well known and the mechanical response of this material in a low-gravity environment is not well understood. Aims. In order to improve our understanding of low-speed impact processes on granular media and their outcome in low-gravity environments, we consider the landing of the package MASCOT, to be released by the JAXA asteroid sample return mission Hayabusa2 on (162173) Ryugu in October 2018. Beyond addressing the theoretical aspects of the mechanical response of granular media in low gravity, this study also supports both engineering and scientific teams of Hayabusa2 in the search for the lander and in the determination of Ryugu’s surface properties. Methods. A campaign of hundreds of numerical simulations using the soft-sphere discrete element method implemented in the N-body code pkdgrav were performed to study the interaction between the lander and the low-gravity surface of the asteroid made of a granular medium representing the regolith. Assuming a broad range of regolith properties, and the lander’s trajectory and motion, we analyzed the outcomes of the landing (distance traveled by the lander, penetration depth, and shape of the traces left in the regolith surface) to determine the influence of the many parameters defining the properties of MASCOT and of the grains, and the ingoing motion of the lander. Results. We identify well-marked trends for the fate of the lander and the traces left in the granular material. Distances traveled by the lander are greater and penetrations are shallower for gravel-like media than for less frictional material. A similar trend is found for grazing impacts as opposed to vertical ones. Different regolith properties also generate different traces on the ground after the impact

Item URL in elib:https://elib.dlr.de/125064/
Document Type:Article
Title:Numerical modeling of lander interaction with a low-gravity Asteroid regolith surface: application to MASCOT onboard Hayabusa2
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Thuillet, FlorianUniversité Cote d'Azur, CNRS, FranceUNSPECIFIED
Michel, PatrickUniversité Côte d’Azur, CNRS, FranceUNSPECIFIED
Maurel, ClaraMassachusetts Institute of TechnologyUNSPECIFIED
Ballouz, Ronald-LouisUniversity of Maryland & JAXAUNSPECIFIED
Zhang, YunUniversity of Maryland & Tsinghua University BeijingUNSPECIFIED
Richardson, Derek C.Univ. Maryland, USAUNSPECIFIED
Biele, JensJens.Biele (at) dlr.deUNSPECIFIED
Tatsumi, EriDep. of Earth and Planetary Science, univ. of TokyoUNSPECIFIED
Sugita, S.University of Tokyo, Tokyo, JapanUNSPECIFIED
Date:13 July 2018
Journal or Publication Title:Astronomy and Astrophysics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
ecp, SciencesUNSPECIFIED
Publisher:EDP Sciences
Keywords:minor planets, asteroids: individual: (162173) Ryugu / methods: numerical
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):Project MASCOT Science and operation
Location: Köln-Porz
Institutes and Institutions:Space Operations and Astronaut Training > User center for space experiments (MUSC)
Deposited By: Herrmann, Astrid
Deposited On:18 Dec 2018 11:12
Last Modified:18 Dec 2018 11:12

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