elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Highly porous nature of a primitive asteroid revealed by thermal imaging

Okada, Tatsuaki and Fukuhara, Tetsuya and Tanaka, Satoshi and Taguchi, Makoto and Arai, Takehiko and Senshu, Hiroki and Sakatani, Naoya and Shimaki, Yuri and Demura, Hirohide and Ogawa, Yoshiko and Suko, Kentaro and Sekiguchi, Tomohiko and Kouyama, Toru and Takita, Jun and Matsunaga, Tsuneo and Imamura, Takeshi and Wada, Takehiko and Hasegawa, Sunao and Helbert, Jörn and Müller, Thomas G. and Hagermann, A. and Biele, Jens and Grott, Matthias and Hamm, Maximilian and Delbo, Marco and Hirata, Naru and Hirata, Naoyuki and Yamamoto, Yukio and Sugita, Seiji and Namiki, Noriyuki and Kitazato, Kohei and Arakawa, Masahiko and Tachibana, Shogo and Ikeda, Hitoshi and Ishiguro, Masateru and Wada, Koji and Honda, Chikatoshi and Honda, Rie and Ishihara, Yoshiaki and Matsumoto, Koji and Matsuoka, Moe and Michikami, Tatsuhiro and Miura, Akira and Morota, Tomokatsu and Noda, Hirotomo and Noguchi, Rina and Ogawa, Kazunori and Shirai, Kei and Tatsumi, Eri and Yabuta, Hikaru and Yokota, Yasuhiro and Yamada, Manabu and Abe, Masanao and Hayakawa, Masahiko and Iwata, Takahiro and Ozaki, Masanobu and Yano, Hajime and Hosoda, Satoshi and Mori, Osamu and Sawada, Hirotaka and Shimada, Takanobu and Takeuchi, Hiroshi and Tsukizaki, Ryudo and Fujii, Atsushi and Hirose, Chikako and Kikuchi, Shota and Mimasu, Yuya and Ogawa, Naoko and Ono, Go and Takahashi, Tadateru and Takei, Yuto and Yamaguchi, Tomohiro and Yoshikawa, Kent and Terui, Fuyuto and Saiki, Takanao and Nakazawa, Satoru and Yoshikawa, Makoto and Watanabe, Seiichiro and Tsuda, Yuichi (2020) Highly porous nature of a primitive asteroid revealed by thermal imaging. Nature, 579 (7800), pp. 518-522. Nature Publishing Group. doi: 10.1038/s41586-020-2102-6. ISSN 0028-0836.

Full text not available from this repository.

Official URL: https://www.nature.com/articles/s41586-020-2102-6

Abstract

Carbonaceous (C-type) asteroids are relics of the early Solar System that have preserved primitive materials since their formation approximately 4.6 billion years ago. They are probably analogues of carbonaceous chondrites and are essential for understanding planetary formation processes. However, their physical properties remain poorly known because carbonaceous chondrite meteoroids tend not to survive entry to Earth’s atmosphere. Here we report on global one-rotation thermographic images of the C-type asteroid 162173 Ryugu, taken by the thermal infrared imager (TIR) onboard the spacecraft Hayabusa2, indicating that the asteroid’s boulders and their surroundings have similar temperatures, with a derived thermal inertia of about 300 J m−2 s−0.5 K−1 (300 tiu). Contrary to predictions that the surface consists of regolith and dense boulders, this low thermal inertia suggests that the boulders are more porous than typical carbonaceous chondrites and that their surroundings are covered with porous fragments more than 10 centimetres in diameter. Close-up thermal images confirm the presence of such porous fragments and the flat diurnal temperature profiles suggest a strong surface roughness effect. We also observed in the close-up thermal images boulders that are colder during the day, with thermal inertia exceeding 600 tiu, corresponding to dense boulders similar to typical carbonaceous chondrites. These results constrain the formation history of Ryugu: the asteroid must be a rubble pile formed from impact fragments of a parent body with microporosity of approximately 30 to 50 per cent that experienced a low degree of consolidation. The dense boulders might have originated from the consolidated innermost region or they may have an exogenic origin. This high-porosity asteroid may link cosmic fluffy dust to dense celestial bodies.

Item URL in elib:https://elib.dlr.de/138230/
Document Type:Article
Title:Highly porous nature of a primitive asteroid revealed by thermal imaging
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Okada, TatsuakiISAS Institute of Space and Astronautical Science, JapanUNSPECIFIED
Fukuhara, TetsuyaRikkyo University, Tokyo, JapanUNSPECIFIED
Tanaka, SatoshiInstitute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, JapanUNSPECIFIED
Taguchi, MakotoRikkyo University, Tokyo, JapanUNSPECIFIED
Arai, TakehikoInstitute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, JapanUNSPECIFIED
Senshu, Hirokiplanetary exploration research center, chiba institute of technology, narashino, japanUNSPECIFIED
Sakatani, NaoyaInstitute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, JapanUNSPECIFIED
Shimaki, Yuriplanetary exploration research center, chiba institute of technology, narashino, japanUNSPECIFIED
Demura, HirohideCenter for Advanced Information Science and Technology, University of Aizu, Aizu-Wakamatsu, JapanUNSPECIFIED
Ogawa, YoshikoCenter for Advanced Information Science and Technology, University of Aizu, Aizu-Wakamatsu, JapanUNSPECIFIED
Suko, Kentaroplanetary exploration research center, chiba institute of technology, narashino, japanUNSPECIFIED
Sekiguchi, TomohikoHokkaido University of Education, Asahikawa, JapanUNSPECIFIED
Kouyama, ToruNational Institute for Advanced Industrial Science and Technology, Tokyo, JapanUNSPECIFIED
Takita, JunGraduate School of Science, The University of Tokyo, Bunkyo Tokyo, JapanUNSPECIFIED
Matsunaga, TsuneoCenter for Global Environmental Research, National Institute for Environmental Studies, Tsukuba, JapanUNSPECIFIED
Imamura, TakeshiGraduate School of Frontiers Sciences, The University of Tokyo Kashiwa, JapanUNSPECIFIED
Wada, TakehikoInstitute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, JapanUNSPECIFIED
Hasegawa, SunaoInstitute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, JapanUNSPECIFIED
Helbert, JörnJoern.Helbert (at) dlr.dehttps://orcid.org/0000-0001-5346-9505
Müller, Thomas G.Max-Planck Institute for Extraterrestrial Physics, Garching, 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, MarcoObservatoire de la Cote d'Azur, FranceUNSPECIFIED
Hirata, Naruisas/jaxa japanUNSPECIFIED
Hirata, Naoyukiisas/jaxa japanUNSPECIFIED
Yamamoto, Yukioisas/jaxa japanUNSPECIFIED
Sugita, SeijiUniversity of Tokyo, Tokyo, JapanUNSPECIFIED
Namiki, NoriyukiEarth-Life Science Institute, Tokyo Tech, JapanUNSPECIFIED
Kitazato, KoheiCenter for Advanced Information Science and Technology, University of Aizu, Aizu-Wakamatsu, JapanUNSPECIFIED
Arakawa, Masahikoisas/jaxa japanUNSPECIFIED
Tachibana, Shogoisas/jaxa japanUNSPECIFIED
Ikeda, Hitoshiisas/jaxa japanUNSPECIFIED
Ishiguro, MasateruSeoul National UniversityUNSPECIFIED
Wada, KojiChiba Institute of TechnologyUNSPECIFIED
Honda, Chikatoshiisas/jaxa japanUNSPECIFIED
Honda, RieKochi University, Kochi 780-8520, JapanUNSPECIFIED
Ishihara, Yoshiakiisas/jaxa japanUNSPECIFIED
Matsumoto, KojiNational Astronomical Observatory of JapanUNSPECIFIED
Matsuoka, MoeInstitute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency, Sagamihara, JapanUNSPECIFIED
Michikami, TatsuhiroKindai University, Hiroshima, JapanUNSPECIFIED
Miura, Akiraisas/jaxa japanUNSPECIFIED
Morota, Tomokatsuisas/jaxa japanUNSPECIFIED
Noda, HirotomoNational Astronomical Observatory of JapanUNSPECIFIED
Noguchi, Rinaisas/jaxa japanUNSPECIFIED
Ogawa, KazunoriDep. of Planetology, Kobe University, Kobe - JapanUNSPECIFIED
Shirai, Keiisas/jaxa japanUNSPECIFIED
Tatsumi, EriDep. of Earth and Planetary Science, univ. of TokyoUNSPECIFIED
Yabuta, Hikaruisas/jaxa japanUNSPECIFIED
Yokota, Yasuhiroisas/jaxa japanUNSPECIFIED
Yamada, ManabuPERC, Narashino, JapanUNSPECIFIED
Abe, MasanaoISAS, JapanUNSPECIFIED
Hayakawa, Masahikoisas/jaxa japanUNSPECIFIED
Iwata, Takahirojapan aerospace exploration agency (jaxa), japanUNSPECIFIED
Ozaki, MasanobuISAS/JAXA, JapanUNSPECIFIED
Yano, HajimeInstitute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), Sagamihara 252-5210, JapanUNSPECIFIED
Hosoda, Satoshiisas/jaxa japanUNSPECIFIED
Mori, OsamuJapan Aerospace Exploration Agency (JAXA), Sagamihara, JapanUNSPECIFIED
Sawada, Hirotakaisas/jaxa japanUNSPECIFIED
Shimada, Takanobuisas/jaxa japanUNSPECIFIED
Takeuchi, Hiroshiisas/jaxa japanUNSPECIFIED
Tsukizaki, Ryudoisas/jaxa japanUNSPECIFIED
Fujii, Atsushiisas/jaxa japanUNSPECIFIED
Hirose, Chikakoisas/jaxa japanUNSPECIFIED
Kikuchi, Shotaisas/jaxa japanUNSPECIFIED
Mimasu, YuyaJapan Aerospace Exploration Agency (JAXA), Sagamihara, JapanUNSPECIFIED
Ogawa, Naokoisas/jaxa japanUNSPECIFIED
Ono, Goisas/jaxa japanUNSPECIFIED
Takahashi, Tadateruisas/jaxa japanUNSPECIFIED
Takei, YutoDepartment of Mechanical and Aerospace Engineering, Graduate School of Science and Engineering, Tokyo InstituteUNSPECIFIED
Yamaguchi, Tomohiroisas/jaxa japanUNSPECIFIED
Yoshikawa, Kentisas/jaxa japanUNSPECIFIED
Terui, Fuyutoisas/jaxa japanUNSPECIFIED
Saiki, Takanaoisas/jaxa japanUNSPECIFIED
Nakazawa, Satoruisas/jaxa japanUNSPECIFIED
Yoshikawa, MakotoInstitute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency, Sagamihara, JapanUNSPECIFIED
Watanabe, Seiichiroisas/jaxa japanUNSPECIFIED
Tsuda, Yuichiisas/jaxa, japanUNSPECIFIED
Date:2020
Journal or Publication Title:Nature
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:579
DOI :10.1038/s41586-020-2102-6
Page Range:pp. 518-522
Publisher:Nature Publishing Group
ISSN:0028-0836
Status:Published
Keywords:Hayabusa, Ryuku, Asteroiden, Regolith, Thermisches Infrarot
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 Laboratories
Institute of Planetary Research > Planetary Physics
Space Operations and Astronaut Training > User center for space experiments (MUSC)
Deposited By: Helbert, Dr.rer.nat. Jörn
Deposited On:26 Nov 2020 09:40
Last Modified:26 Nov 2020 09:40

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.