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Predicted strength, microporosity, thermal conductivity and grain density of Ryugu rock samples

Biele, Jens and Grott, Matthias and Michel, Patrick and Okada, Tatsuaki and Sugita, Seiji and Sakatani, Naoya and Neumann, Wladimir and Kameda, Shingo and Michikami, Tatsuhiro and Honda, Chikatoshi (2021) Predicted strength, microporosity, thermal conductivity and grain density of Ryugu rock samples. Japan Geoscience Union Meeting 2021 (JpGU 2021), 30. Mai - 06. Jun. 2021, virtuell.

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Abstract

In this presentation, we summarize the findings and interpretations of the physical and thermophysical properties of C-type asteroid 162173 Ryugu obtained from Hayabusa2 remote sensing as well as from MASCOT radiometer (MARA) data. For a typical rock on Ryugu's surface, we find a thermal inertia of 295 ± 18 Jm-2K-1s-1/2 (Hamm+ 2020), a microporosity of 50 ± 3% (Grott+ 2020, Hamm+, 2020), and assuming a CM chondrite composition and thus an inferred specific heat capacity of cp=890 J/kg/K ( ± 10%, at an average temperature of 277K), we estimate a thermal conductivity of 0.069 ± 0.012 J/m/K at ~277 K. These estimates are based on MARA surface brightness temperature measurements of an arguably (Biele et al, 2019) dust-free boulder at MASCOT's landing site obtained over a full diurnal cycle. Those values are consistent with the TIR instrument's global findings (Okada+ 2020). The very high deduced microporosity lets us reasonably estimate the tensile strength of those abundant "cauliflower rocks" (Jaumann+ 2019), ~200-280 kPa (Grott+, 2019).

Item URL in elib:https://elib.dlr.de/142764/
Document Type:Conference or Workshop Item (Speech)
Title:Predicted strength, microporosity, thermal conductivity and grain density of Ryugu rock samples
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Biele, JensJens.Biele (at) dlr.deUNSPECIFIED
Grott, MatthiasMatthias.Grott (at) dlr.deUNSPECIFIED
Michel, PatrickUniversité Côte d’Azur, CNRS, FranceUNSPECIFIED
Okada, TatsuakiJAXA-ISAS, Sagamihara, JapanUNSPECIFIED
Sugita, SeijiUniversity of Tokyo, Tokyo, JapanUNSPECIFIED
Sakatani, NaoyaRikkyo University JapanUNSPECIFIED
Neumann, WladimirWladimir.Neumann (at) dlr.deUNSPECIFIED
Kameda, ShingoRikkyo University, JapanUNSPECIFIED
Michikami, TatsuhiroKindai University, Hiroshima, JapanUNSPECIFIED
Honda, ChikatoshiUniv Aizu, Res Ctr Adv Informat Sci & Technol, Aizu Wakamatsu, Fukushima, JapanUNSPECIFIED
Date:June 2021
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:microporosity, thermal conductivity, Ryugy
Event Title:Japan Geoscience Union Meeting 2021 (JpGU 2021)
Event Location:virtuell
Event Type:international Conference
Event Dates:30. Mai - 06. Jun. 2021
Organizer:Japan Geoscience Union (JpGU)
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):R - Project MMX - miniRad and Science
Location: Berlin-Adlershof , Köln-Porz
Institutes and Institutions:Space Operations and Astronaut Training > User center for space experiments (MUSC)
Institute of Planetary Research > Planetary Physics
Deposited By: Herrmann, Astrid
Deposited On:16 Jun 2021 10:06
Last Modified:16 Jun 2021 10:06

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