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Quick-look results for the surface/regolith mechanical properties of Ryugu based on MASCOT bouncing analyses

Biele, Jens and Michel, Patrick and Yano, Hajime and Lorda, Laurence and Canalias, Elisabet and Martin, Thierry and Garmier, Romain and Thuillet, Florian and Hercik, David and Auster, Hans-Ulrich and Schmitz, Nicole (Admin.), Funktional and Sugita, Seiji and Kameda, Shingo and Tardivel, Simon and Witte, Lars and Jaumann, Ralf and Ulamec, Stephan and Ho, Tra-Mi and Moussi-Soffys, Aurelie and Wolff, Friederike and van Wal, Stefaan (2018) Quick-look results for the surface/regolith mechanical properties of Ryugu based on MASCOT bouncing analyses. Hayabusa 2 Symposium, 6. - 7. Dezember 2018, Tokyo, Japan.

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We present quick-look results and constraints on the mechanical properties of the regolith on asteroid 162173 Ryugu, based on expected data regarding the mechanical interactions by the lander MASCOT as well as data from MINERVA nano-landers and possibly from the first sampling touchdown by Hayabusa2. MASCOT is going to be deployed from an altitude of ~55 m and has a touch-down velocity of ~0.2 m/s. It is expected to bounce several times before coming to rest [3]. The descent trajectory and the larger bouncing arcs can be captured by optical imaging from the spacecraft (ONC [5]) giving constraints on MASCOT in-flight trajectories. Moreover, direct images of footprints as well as data from MASCOT’s magnetometer MASMAG [4] on bounce times (and possibly rotation rates or changes thereof), images by MASCOT’s camera MASCAM [2] during bouncing and their fusion with ONC images projected to the shape, and finally MASCAM images after rest offer a rich database that allows us to constrain Ryugu’s surface mechanical properties, with implications on the asteroid’s surface history. Variations of the radio-frequency signal all along MASCOT’s trajectory and day/night detection by MASCOT’s photoelectric cell sensors can also contribute to the analysis. The measured total linear energetic coefficient of restitution (CoR), i.e. the fraction of energy dissipated at each bounce, can be compared to the CoR values measured for the MASCOT structure bouncing against a hard wall [6] and soft-sphere DEM simulations of MASCOT landing on a bed of granular material [7,8]. Footprint images of the bounce imprints in loose granular material also constrain the granular frictional properties and the regolith depth. Preliminary conclusions on the mechanical properties of Ryugu’s surface material will be drawn

Item URL in elib:https://elib.dlr.de/125061/
Document Type:Conference or Workshop Item (Speech)
Title:Quick-look results for the surface/regolith mechanical properties of Ryugu based on MASCOT bouncing analyses
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Biele, JensJens.Biele (at) dlr.deUNSPECIFIED
Michel, PatrickObservatoire de la Côte d’Azur, FranceUNSPECIFIED
Lorda, LaurenceCNES, ToulouseUNSPECIFIED
Canalias, ElisabetCNES, ToulouseUNSPECIFIED
Martin, ThierryCNES, ToulouseUNSPECIFIED
Garmier, RomainCS-SI, ToulouseUNSPECIFIED
Thuillet, FlorianUniversité Cote d'Azur, CNRSUNSPECIFIED
Hercik, DavidTU BraunschweigUNSPECIFIED
Auster, Hans-UlrichTU Braunschweig, GermanyUNSPECIFIED
Schmitz, Nicole (Admin.), FunktionalNicole.Schmitz (at) dlr.deUNSPECIFIED
Sugita, SeijiUniversity of Tokyo, Tokyo, JapanUNSPECIFIED
Kameda, ShingoDep. of Physics, Rikkyo University, TokyoUNSPECIFIED
Tardivel, SimonSimon.Tardivel (at) cnes.frUNSPECIFIED
Witte, LarsLars.Witte (at) dlr.dehttps://orcid.org/0000-0002-3921-2524
Jaumann, Ralfralf.jaumann (at) dlr.dehttps://orcid.org/0000-0002-9759-6597
Ulamec, StephanStephan.Ulamec (at) dlr.deUNSPECIFIED
Ho, Tra-MiTra-Mi.Ho (at) dlr.deUNSPECIFIED
Moussi-Soffys, AurelieCNES ToulouseUNSPECIFIED
Wolff, FriederikeFriederike.Wolff (at) dlr.deUNSPECIFIED
Date:8 December 2018
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:MASCOT, Hayabusa 2, Ryugu
Event Title:Hayabusa 2 Symposium
Event Location:Tokyo, Japan
Event Type:international Conference
Event Dates:6. - 7. Dezember 2018
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):Project MASCOT Science and operation (old)
Location: Berlin-Adlershof , Bremen , Köln-Porz , Oberpfaffenhofen
Institutes and Institutions:Space Operations and Astronaut Training > User center for space experiments (MUSC)
Institute of System Dynamics and Control > Space System Dynamics
Institute of Planetary Research > Planetary Geology
Institute of Space Systems > Land and Exploration Technology
Institute of Space Systems > Systems Engineering and Project Office
Deposited By: Herrmann, Astrid
Deposited On:17 Dec 2018 11:05
Last Modified:07 Jan 2019 09:59

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