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Macroporosity and Grain Density of Rubble Pile Asteroid (162173) Ryugu

Grott, Matthias and Biele, Jens and Michel, Patrick and Sugita, Seiji and Schröder, Stefan and Sakatani, N. and Neumann, Wladimir and Kameda, S. and Michikami, T. and Honda, C. (2020) Macroporosity and Grain Density of Rubble Pile Asteroid (162173) Ryugu. Journal of Geophysical Research: Planets. Wiley. doi: 10.1029/2020JE006519. ISSN 2169-9097.

[img] PDF - Postprint version (accepted manuscript)

Official URL: https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020JE006519


The carbonaceous asteroid (162173) Ryugu formed from fragments which re-accreted after its parent body was disrupted by a catastrophic collision. Asteroids of this type are also known as rubble piles and the re-accumulation process is thought to be one of the causes for their large bulk porosity. We have applied mixing models to determine the amount of inter-boulder porosity taking the observed abundance of large and small boulders on the surface into account. We find that the relative abundances of differently sized boulders allow for a very efficient packing, such that inter-boulder porosity in Ryugu is rather small and only $16 \pm 3$~\%. This implies that a large part of { Ryugu's} total porosity must reside inside the boulders themselves. Using estimates of boulder intrinsic porosity, we furthermore constrain the average density of the boulder's constituent minerals to { $2848 \pm 152$ kg m$^{-3}$}, which is consistent with values measured for carbonaceous meteorites as collected on Earth. Thus, inter-boulder porosity of rubble pile asteroids may have been systematically overestimated in the past.

Item URL in elib:https://elib.dlr.de/137050/
Document Type:Article
Additional Information:Bisher nur online erschienen.
Title:Macroporosity and Grain Density of Rubble Pile Asteroid (162173) Ryugu
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Grott, MatthiasUNSPECIFIEDhttps://orcid.org/0000-0002-8613-7096UNSPECIFIED
Biele, JensUNSPECIFIEDhttps://orcid.org/0000-0002-7414-829XUNSPECIFIED
Michel, PatrickObservatoire de la Côte d’Azur, FranceUNSPECIFIEDUNSPECIFIED
Sugita, SeijiUniversity of Tokyo, Tokyo, JapanUNSPECIFIEDUNSPECIFIED
Schröder, StefanUNSPECIFIEDhttps://orcid.org/0000-0003-0323-8324UNSPECIFIED
Sakatani, N.Institute of Space and Astronautical Science , Japan Aerospace Exploration Agency (ISAS / JAXA) ( 3 - 1 - 1 Yoshinodai, Chuo - Ku, Sa gamihara 2 52 - 5210 , JapanUNSPECIFIEDUNSPECIFIED
Kameda, S.Rikkyo University, Tokyo 171-8501, JapanUNSPECIFIEDUNSPECIFIED
Michikami, T.Kindai University, Higashi-Hiroshima 739-2116, JapanUNSPECIFIEDUNSPECIFIED
Honda, C.Univ Aizu, Res Ctr Adv Informat Sci & Technol, Aizu Wakamatsu, Fukushima, JapanUNSPECIFIEDUNSPECIFIED
Journal or Publication Title:Journal of Geophysical Research: Planets
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Keywords:Asteroiden Ryugu Hayabusa2 MASCOT
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 , Köln-Porz
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Space Operations and Astronaut Training > User center for space experiments (MUSC)
Institute of Planetary Research > Planetary Geology
Deposited By: Grott, Dr.rer.nat. Matthias
Deposited On:25 Nov 2020 10:20
Last Modified:24 Oct 2023 10:57

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