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Status: Bibliographieeintrag

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Verfasst von:Grott, Matthias [VerfasserIn]   i
 Biele, Jens [VerfasserIn]   i
 Michel, Patrick [VerfasserIn]   i
 Sugita, Seiji [VerfasserIn]   i
 Schröder, Stefan [VerfasserIn]   i
 Sakatani, Naoya [VerfasserIn]   i
 Neumann, Wladimir [VerfasserIn]   i
 Kameda, Shingo [VerfasserIn]   i
 Michikami, Tatsuhiro [VerfasserIn]   i
 Honda, Chikatoshi [VerfasserIn]   i
Titel:Macroporosity and grain density of rubble pile asteroid (162173) Ryugu
Verf.angabe:Matthias Grott, Jens Biele, Patrick Michel, Seiji Sugita, Stefan Schröder, Naoya Sakatani, Wladimir Neumann, Shingo Kameda, Tatsuhiro Michikami, and Chikatoshi Honda
E-Jahr:2020
Jahr:02 November 2020
Umfang:15 S.
Fussnoten:Gesehen am 11.02.2021
Titel Quelle:Enthalten in: Journal of geophysical research / Planets
Ort Quelle:Hoboken, NJ : Wiley, 1991
Jahr Quelle:2020
Band/Heft Quelle:125(2020,12) Artikel-Nummer e2020JE006519, 15 Seiten
ISSN Quelle:2169-9100
Abstract:Rubble pile asteroids such as (162173) Ryugu have large bulk porosities, which are believed to result from void spaces in between the constituent boulders (macroporosity) as well as void spaces within the boulders themselves (microporosity). In general, both macroporosity and microporosity are estimated based on comparisons between the asteroid bulk density and both the bulk and grain density of meteorite analogs, and relatively large macroporosities are usually obtained. Here we use semiempirical models for the macroporosity of multicomponent mixtures to determine Ryugu's macroporosity based on the observed size-frequency distribution (SFD) of boulders on the surface. We find that Ryugu's macroporosity can be significantly smaller than usually assumed, as the observed SFD allows for an efficient packing of boulders, resulting in a macroporosity of 16% ± 3%. Therefore, we confirm that Ryugu's high bulk porosity is a direct consequence of a very large boulder microporosity. Furthermore, using estimates of boulder microporosity of around 50% as derived from in situ measurements, the average grain density in boulders is 2,848 ± 152 kg m-3, similar to values obtained for CM and the Tagish lake meteorites. Ryugu's bulk porosity corresponding to the above values is 58%. Thus, the macroporosity of rubble pile asteroids may have been systematically overestimated in the past.
DOI:doi:10.1029/2020JE006519
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext ; Verlag: https://doi.org/10.1029/2020JE006519
 Volltext: https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2020JE006519
 DOI: https://doi.org/10.1029/2020JE006519
Datenträger:Online-Ressource
Sprache:eng
Sach-SW:Asteroids
 Density
 Porosity
 Ryugu
K10plus-PPN:1748093525
Verknüpfungen:→ Zeitschrift

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