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Fine-grained region with low thermal inertia in craters on Ryugu

Sakatani, N. and Tanaka, S. and Okada, T. and Senshu, H. and Arai, T. and Demura, H. and Suko, K. and Shimaki, Y. and Sekiguchi, Tomohiko and Takita, J. and Fuhuhara, T. and Tagucchi, M. and Müller, T. and Hagermann, A. and Biele, Jens and Grott, Matthias and Hamm, Maximilian and Delbo, M and Sugita, Seiji and Honda, R. and Morota, T. and Yamada, M. and Kameda, S. and Tatsumi, E. and Yokota, Y. and Kouyama, Toru and Suzuki, H. and Honda, C. and Ogawa, Kazunori and Hayakawa, M. and Yoshioka, K. and Matsuoka, A. and Cho, Yuichiro and Sawada, H. and Miuara, A. (2019) Fine-grained region with low thermal inertia in craters on Ryugu. Asteroid Science in the Age of Hayabusa2 and OSIRIS-REx, 05. - 07.11.2019, Tucson, USA.

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Abstract

Introduction: The Hayabusa2 spacecraft is surveying asteroid Ryugu from June 2018. Global observation by thermal infrared imager TIR revealed low thermal inertia around 200-300J m-2 K-1 s-0.5 [1]. The expected grain size from this thermal inertia was several centimeters [2]. However, the surface of Ryugu is globally filled with larger boulders [3]. These observational results indicate highly porous nature of the surface boulders with low thermal inertia, unexpectedly different from the carbonaceous meteorites we have. Local observations by MARA radiometer onboard MASCOT lander supported it [4, 5]. In addition to the global observation, close-up imaging by TIR during descending operations, including MINERVA and MASCOT releases, touch-down operations and their rehearsals, were conducted. The high resolution TIR images revealed local temperature anomaly related to the boulders [6] and craters, which showed local variation in thermophysical properties.In this study, we show survey of thermally-unusual craters on Ryugu using these close-up images. The unique feature were found as hot spot around the center of some small craters.

Item URL in elib:https://elib.dlr.de/131397/
Document Type:Conference or Workshop Item (Speech)
Title:Fine-grained region with low thermal inertia in craters on Ryugu
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Sakatani, N.jaxa-isas, sagamihara, japanUNSPECIFIED
Tanaka, S.jaxa-isas, sagamihara, japanUNSPECIFIED
Okada, T.JAXA-ISAS, Sagamihara, JapanUNSPECIFIED
Senshu, H.Chiba Institute of Technology, JapanUNSPECIFIED
Arai, T.Ashikaga University, JapanUNSPECIFIED
Demura, H.University of Aizu, JapanUNSPECIFIED
Suko, K.University of Aizu, JapanUNSPECIFIED
Shimaki, Y.JAXA-ISAS, Sagamihara, JapanUNSPECIFIED
Sekiguchi, TomohikoHokkaido University of Education, Asahikawa, JapanUNSPECIFIED
Takita, J.Hokkaido Kitami Hokuto High School, JapanUNSPECIFIED
Fuhuhara, T.Rikkyo University, JapanUNSPECIFIED
Tagucchi, M.Rikkyo University, JapanUNSPECIFIED
Müller, T.Max-Planck-Insitutut Extraterrestrische Physik, GermanyUNSPECIFIED
Hagermann, A.University of Stirling, UKUNSPECIFIED
Biele, JensJens.Biele (at) dlr.deUNSPECIFIED
Grott, MatthiasMatthias.Grott (at) dlr.deUNSPECIFIED
Hamm, Maximilianmaximilian.hamm (at) dlr.deUNSPECIFIED
Delbo, MObservatoire de la Cote d'Azur, FranceUNSPECIFIED
Sugita, SeijiUniversity of Tokyo, Tokyo, JapanUNSPECIFIED
Honda, R.Kochi University, JapanUNSPECIFIED
Morota, T.University of Tokyo, JapanUNSPECIFIED
Yamada, M.Chiba University, JapanUNSPECIFIED
Kameda, S.Rikkyo University, JapanUNSPECIFIED
Tatsumi, E.Instituo de Astrofisica de Canarias, Tenerife, SpainUNSPECIFIED
Yokota, Y.JAXA-ISAS, Sagamihara, JapanUNSPECIFIED
Kouyama, ToruNational Institute for Advanced Industrial Science and Technology, Tokyo, JapanUNSPECIFIED
Suzuki, H.Meiji University, JapanUNSPECIFIED
Honda, C.Univ Aizu, Res Ctr Adv Informat Sci & Technol, Aizu Wakamatsu, Fukushima, JapanUNSPECIFIED
Ogawa, KazunoriDep. of Planetology, Kobe University, Kobe - JapanUNSPECIFIED
Hayakawa, M.JAXA-ISAS, Sagamihara, JapanUNSPECIFIED
Yoshioka, K.University of Tokyo, JapanUNSPECIFIED
Matsuoka, A.Japan Aerospace Exploration Agency (JAXA), Sagamihara, JapanUNSPECIFIED
Cho, YuichiroThe University of Tokyo, Department of Earth and Planetary ScienceUNSPECIFIED
Sawada, H.JAXA-ISAS, Sagamihara, JapanUNSPECIFIED
Miuara, A.JAXA-ISAS, Sagamihara, JapanUNSPECIFIED
Date:4 November 2019
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:2189
Page Range:p. 2081
Series Name:LPI Contribution
Status:Published
Keywords:Hayabusa2 Ryugu
Event Title:Asteroid Science in the Age of Hayabusa2 and OSIRIS-REx
Event Location:Tucson, USA
Event Type:international Conference
Event Dates:05. - 07.11.2019
Organizer:NASA, University of Alabama
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):Project MASCOT Science and operation
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:02 Dec 2019 09:50
Last Modified:02 Dec 2019 09:50

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