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Surface roughness of asteroid (162173) Ryugu and comet 67P/Churyumov-Gerasimenko inferred from in-situ observations

Otto, Katharina A. and Matz, K-D and Schröder, Stefan and Parekh, Rutu Ashwin and Krohn, Katrin and Honda, Rie and Kameda, Shingo and Jaumann, Ralf and Schmitz, Nicole and Stephan, Katrin and Sugita, Seiji and Tatsumi, Eri and Ho, Tra-Mi and Koncz, Alexander and Trauthan, Frank and Cho, Yuichiro and Hayakawa, M. and Honda, C. and Kouyama, T. and Matsuoka, Moe and Morota, T. and Mottola, Stefano and Ogawa, K. and Preusker, Frank and Sakatani, N. and Sawada, H. and Scholten, Frank and Suzuki, H. and Yamada, M. and Yokota, Y. and Yoshioka, K. (2021) Surface roughness of asteroid (162173) Ryugu and comet 67P/Churyumov-Gerasimenko inferred from in-situ observations. Monthly Notices of the Royal Astronomical Society, 500 (3), pp. 3178-3193. Oxford University Press. doi: 10.1093/mnras/staa3314/5941524. ISSN 0035-8711.

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Official URL: https://academic.oup.com/mnras/article/500/3/3178/5941524

Abstract

Alteration processes on asteroid and comet surfaces, such as thermal fracturing, (micrometeorite) impacts or volatile outgassing, are complex mechanisms that form diverse surface morphologies and roughness on various scales. These mechanisms and their interaction may differ on the surfaces of different bodies. Asteroid Ryugu and comet 67P/Churyumov–Gerasimenko, both, have been visited by landers that imaged the surfaces in high spatial resolution. We investigate the surface morphology and roughness of Ryugu and 67P/Churyumov–Gerasimenko based on high-resolution in situ images of 0.2 and 0.8 mm pixel resolution over an approximately 25 and 80 cm wide scene, respectively. To maintain comparability and reproducibility, we introduce a method to extract surface roughness descriptors (fractal dimension, Hurst exponent, joint roughness coefficient, root-mean-square slope, hemispherical crater density, small-scale roughness parameter, and Hapke mean slope angle) from in situ planetary images illuminated by LEDs. We validate our method and choose adequate parameters for an analysis of the roughness of the surfaces. We also derive the roughness descriptors from 3D shape models of Ryugu and orbiter camera images and show that the higher spatially resolved images result in a higher roughness. We find that 67P/Churyumov–Gerasimenko is up to 6 per cent rougher than Ryugu depending on the descriptor used and attribute this difference to the different intrinsic properties of the materials imaged and the erosive processes altering them. On 67P/Churyumov–Gerasimenko sublimation appears to be the main cause for roughness, while on Ryugu micrometeoroid bombardment as well as thermal fatigue and solar weathering may play a significant role in shaping the surface.

Item URL in elib:https://elib.dlr.de/139012/
Document Type:Article
Additional Information:Dieser Artikel ist bisher nur online erschienen.
Title:Surface roughness of asteroid (162173) Ryugu and comet 67P/Churyumov-Gerasimenko inferred from in-situ observations
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Otto, Katharina A.Katharina.Otto (at) dlr.dehttps://orcid.org/0000-0002-0675-1177
Matz, K-Dklaus-dieter.matz (at) dlr.deUNSPECIFIED
Schröder, StefanStefanus.Schroeder (at) dlr.dehttps://orcid.org/0000-0003-0323-8324
Parekh, Rutu AshwinRutu.Parekh (at) dlr.deUNSPECIFIED
Krohn, Katrinkatrin.krohn (at) dlr.dehttps://orcid.org/0000-0001-8518-4985
Honda, RieKochi University, Kochi 780-8520, JapanUNSPECIFIED
Kameda, ShingoDep. of Physics, Rikkyo University, TokyoUNSPECIFIED
Jaumann, Ralfralf.jaumann (at) dlr.dehttps://orcid.org/0000-0002-9759-6597
Schmitz, NicoleNicole.Schmitz (at) dlr.dehttps://orcid.org/0000-0001-6481-6189
Stephan, KatrinKatrin.Stephan (at) dlr.deUNSPECIFIED
Sugita, SeijiUniversity of Tokyo, Tokyo, JapanUNSPECIFIED
Tatsumi, EriDep. of Earth and Planetary Science, univ. of TokyoUNSPECIFIED
Ho, Tra-MiTra-Mi.Ho (at) dlr.deUNSPECIFIED
Koncz, AlexanderAlexander.Koncz (at) dlr.deUNSPECIFIED
Trauthan, FrankFrank.Trauthan (at) dlr.deUNSPECIFIED
Cho, YuichiroThe University of Tokyo, Department of Earth and Planetary ScienceUNSPECIFIED
Hayakawa, M.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (ISAS / JAXA) 3-1-1 Yoshinodai, Chuo-Ku, Sagamihara 252-5210, JapanUNSPECIFIED
Honda, C.Univ Aizu, Res Ctr Adv Informat Sci & Technol, Aizu Wakamatsu, Fukushima, JapanUNSPECIFIED
Kouyama, T.National Institute of Advanced Industrial Science and Technology, Tokyo, JapanUNSPECIFIED
Matsuoka, MoeInstitute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency, Sagamihara, JapanUNSPECIFIED
Morota, T.University of Tokyo, JapanUNSPECIFIED
Mottola, StefanoStefano.Mottola (at) dlr.deUNSPECIFIED
Ogawa, K.Kobe University, Kobe 657-8501, JapanUNSPECIFIED
Preusker, Frankfrank.preusker (at) dlr.deUNSPECIFIED
Sakatani, N.ISAS, JAXA, JapanUNSPECIFIED
Sawada, H.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (ISAS / JAXA) 3-1-1 Yoshinodai, Chuo-Ku, Sagamihara 252-5210, JapanUNSPECIFIED
Scholten, Frankfrank.scholten (at) dlr.deUNSPECIFIED
Suzuki, H.Meiji University, Kawasaki 214-8571, JapanUNSPECIFIED
Yamada, M.Planetary Exploration Research Center, Chiba Institute of Technology, Narashino 275-0016, JapanUNSPECIFIED
Yokota, Y.ISAS, JAXA, JapanUNSPECIFIED
Yoshioka, K.University of Tokyo, JapanUNSPECIFIED
Date:January 2021
Journal or Publication Title:Monthly Notices of the Royal Astronomical Society
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:500
DOI :10.1093/mnras/staa3314/5941524
Page Range:pp. 3178-3193
Publisher:Oxford University Press
ISSN:0035-8711
Status:Published
Keywords:Roughness, asteroids, comets, in-situ observations, Ryugu, &/P/Churyumov-Gerasimenko
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 , Bremen
Institutes and Institutions:Institute of Planetary Research > Planetary Geology
Institute of Planetary Research > Planetary Sensor Systems
Institute of Space Systems > Systems Engineering and Project Office
Institute of Planetary Research > Planetary Geodesy
Deposited By: Otto, Dr. Katharina A.
Deposited On:04 Dec 2020 08:25
Last Modified:04 Dec 2020 08:25

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