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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.

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

Abstract

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
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Grott, MatthiasMatthias.Grott (at) dlr.deUNSPECIFIED
Biele, JensJens.Biele (at) dlr.deUNSPECIFIED
Michel, PatrickObservatoire de la Côte d’Azur, FranceUNSPECIFIED
Sugita, SeijiUniversity of Tokyo, Tokyo, JapanUNSPECIFIED
Schröder, StefanStefanus.Schroeder (at) dlr.dehttps://orcid.org/0000-0003-0323-8324
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 , JapanUNSPECIFIED
Neumann, WladimirWladimir.Neumann (at) dlr.deUNSPECIFIED
Kameda, S.Rikkyo University, Tokyo 171-8501, JapanUNSPECIFIED
Michikami, T.Kindai University, Higashi-Hiroshima 739-2116, JapanUNSPECIFIED
Honda, C.Univ Aizu, Res Ctr Adv Informat Sci & Technol, Aizu Wakamatsu, Fukushima, JapanUNSPECIFIED
Date:2020
Journal or Publication Title:JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
DOI :10.1029/2020JE006519
Publisher:Wiley
ISSN:2169-9097
Status:Published
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:25 Nov 2020 10:20

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