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Surface physical condition of asteroid Ryugu using close-up optical and thermal images

Sakatani, N. and Sugita, S. and Honda, R. and Morota, T. and Yamada, M. and Kameda, Shingo and Tatsumi, E. and Yokota, S. and Kouyama, T. and Suzuki, H. and Honda, C. and Hayakawa, M. and Yoshioka, K. and Matsuoko, Moe and Cho, Y. and Sawada, H. and Ogawa, N. and Miura, A. and Okada, T. and Tanaka, S. and Senshu, H. and Arai, T. and Demura, Hirohide and Suko, K. and Shimaki, Y. and Sekigucchi, T. and Takita, J. and Fuhuhara, T. and Tagutchi, M. and Müller, T. and Hagermann, A. and Biele, Jens and Grott, Matthias and Delbo, M. (2019) Surface physical condition of asteroid Ryugu using close-up optical and thermal images. 50th Lunar and Planetary Science Conference (LPSC), 18.-22. März 2019, The Woodlands, TX, USA.

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Abstract

In 2018, the Hayabusa2 spacecraft [1] successfully conducted some descend operations toward Ryugu’s surface. They included MINERVA rover release in September, MASCOT lander release and two touchdown rehearsals in October. During these operations, we acquired high-resolved optical and thermal images from altitudes below 100 m, us- ing Optical Navigation Camera (ONC-T) and Ther- mal Infrared Imager (TIR), respectively. Close-up optical images by ONC-T show detailed physical conditions of the surface materials, such as particle size distribution of pebbles, surface morphol- ogy of small boulders and craters. Moreover, close-up thermal images by TIR indicate thermophysical prop- erties of the surface materials and its regional differ- ence, which cannot be resolved by higher altitude observations (e.g., home-position observations from 20 km altitude). Combination between optical and thermal observations is of great importance to under- stand the nature of the asteroid surface materials. In this study, we investigate the surface particle size from close-up ONC images. Thermophysical property of the surface component materials inferred from TIR images is also discussed, especially for the range observed for the thermal inertia of boulders.

Item URL in elib:https://elib.dlr.de/131725/
Document Type:Conference or Workshop Item (Speech)
Title:Surface physical condition of asteroid Ryugu using close-up optical and thermal images
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Sakatani, N.jaxa-isas, sagamihara, japanUNSPECIFIED
Sugita, S.University of Tokyo, Tokyo, JapanUNSPECIFIED
Honda, R.Kochi University, JapanUNSPECIFIED
Morota, T.Nagoya Univ, Grad Sch Environm Studies, Nagoya, Aichi 4648601, JapanUNSPECIFIED
Yamada, M.Chiba Institute of Technology, JapanUNSPECIFIED
Kameda, ShingoRikkyo University, Tokyo 171-8501, JapanUNSPECIFIED
Tatsumi, E.The University of Tokyo, Tokyo 113-0033, JapanUNSPECIFIED
Yokota, S.ISAS/JAXAUNSPECIFIED
Kouyama, T.National Institute of 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
Hayakawa, M.ISAS, JAXA, JapanUNSPECIFIED
Yoshioka, K.University of Tokyo, JapanUNSPECIFIED
Matsuoko, MoeJapan Aerospace Exploration Agency (JAXA), Institute of Space and Astronautical ScienceUNSPECIFIED
Cho, Y.University of Tokyo, JapanUNSPECIFIED
Sawada, H.ISAS, JAXA, JapanUNSPECIFIED
Ogawa, N.Institute of Space and Astronautical Science, Sagamihara, Kanagawa, JapanUNSPECIFIED
Miura, A.JAXA-ISAS, Sagamihara, JapanUNSPECIFIED
Okada, T.JAXA-ISAS, Sagamihara, JapanUNSPECIFIED
Tanaka, S.jaxa-isas, sagamihara, japanUNSPECIFIED
Senshu, H.Planetary Exploration Research Center, Chiba Institute of Technology, Narashino 275-0016, JapanUNSPECIFIED
Arai, T.Ashikaga University, Ashikaga 326-8558, JapanUNSPECIFIED
Demura, HirohideCenter for Advanced Information Science and Technology, University of Aizu, Aizu-Wakamatsu, JapanUNSPECIFIED
Suko, K.University of Aizu, JapanUNSPECIFIED
Shimaki, Y.ISAS-JAXA, Sagamihara, JapanUNSPECIFIED
Sekigucchi, T.Hokkaido University of Education, JapanUNSPECIFIED
Takita, J.Hokkaido University of Education, JapanUNSPECIFIED
Fuhuhara, T.Rikkyo University, JapanUNSPECIFIED
Tagutchi, M.Rikkyo University, JapanUNSPECIFIED
Müller, T.Max-Planck-Institut für Extreterrestrische Physik, GermanyUNSPECIFIED
Hagermann, A.University of Stirling, FK9 4LA, Scotland, UKUNSPECIFIED
Biele, JensJens.Biele (at) dlr.deUNSPECIFIED
Grott, MatthiasMatthias.Grott (at) dlr.deUNSPECIFIED
Delbo, M.Observatoire de la Cote d'Azur, FranceUNSPECIFIED
Date:18 March 2019
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:2132
Page Range:p. 1732
Series Name:LPI Contribution
Status:Published
Keywords:Ryugu, Hayabusa 2
Event Title:50th Lunar and Planetary Science Conference (LPSC)
Event Location:The Woodlands, TX, USA
Event Type:international Conference
Event Dates:18.-22. März 2019
Organizer:NASA, USRA
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):Vorhaben asteroids and comets
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 09:43
Last Modified:02 Dec 2019 09:43

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