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/ | |||||||||||||||||||||||||||||||||
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Document Type: | Article | |||||||||||||||||||||||||||||||||
Additional Information: | Bisher nur online erschienen. | |||||||||||||||||||||||||||||||||
Title: | Macroporosity and Grain Density of Rubble Pile Asteroid (162173) Ryugu | |||||||||||||||||||||||||||||||||
Authors: |
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Date: | 2020 | |||||||||||||||||||||||||||||||||
Journal or Publication Title: | JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS | |||||||||||||||||||||||||||||||||
Refereed publication: | Yes | |||||||||||||||||||||||||||||||||
Open Access: | Yes | |||||||||||||||||||||||||||||||||
Gold Open Access: | No | |||||||||||||||||||||||||||||||||
In SCOPUS: | Yes | |||||||||||||||||||||||||||||||||
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: | 19 Nov 2021 20:31 |
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