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Pinnacles on the surface of the comet 67P/Churyumov-Gerasimenko: regional distribution and morphology

Krasilnikov, S S and Skorov, Y V and Basilevsky, A T and Hviid, S F and Mall, U and Keller, H U (2019) Pinnacles on the surface of the comet 67P/Churyumov-Gerasimenko: regional distribution and morphology. Monthly Notices of the Royal Astronomical Society. Oxford University Press. DOI: 10.1093/mnras/stz3093 ISSN 0035-8711

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Official URL: https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stz3093/5612224

Abstract

Pinnacles are local topographic promontories of different shapes considered to be formed due to uneven surface erosion. In the case of comets, areal changes in the degree of erosion could be related to inhomogeneities of the nucleus. However, the amount of solar radiation and the thermal gradient is different across the orbit for geomorphological regions, which can result in different erosion and shape for a similar composition among two differently illuminated areas. Therefore, a study of the areal distribution of pinnacles on the nucleus surface and their morphology may help to understand the structure and properties of the nucleus material. We mapped 166 pinnacles on the comet nucleus surface of 67P/Churyumov-Gerasimenko. About a third of them have planimetrically rounded shape (rounded pinnacles) and the rest are planimetrically elongated (local ridges). In the southern hemisphere, number of both round pinnacles and local ridges is larger than in the northern hemisphere. This difference possibly indicates the higher effectiveness of the pinnacles’ formation in the southern hemisphere. At the same time the mean values of the measured parameters, including the height, show no statistically reliable difference between the north and south. We found that the maximum height of the pinnacles is about a hundred meters. Suggesting that they have been formed by sublimational erosion, this value allows estimating the minimum thickness of the eroded material and thus the degree of the evolutionary changes of the nucleus. In our future study, we will model pinnacles formation based on the here presented analysis of observations.

Item URL in elib:https://elib.dlr.de/131856/
Document Type:Article
Additional Information:nur online verfügbar.
Title:Pinnacles on the surface of the comet 67P/Churyumov-Gerasimenko: regional distribution and morphology
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Krasilnikov, S SMax Plank Institute for Solar System Researchhttps://orcid.org/0000-0002-5023-3908
Skorov, Y VInstitute for Geophysics and Extraterrestrial Physics, TU Braunschweig, Braunschweig, D-38106 GermanyUNSPECIFIED
Basilevsky, A TVernadsky Institute of Geochemistry and Analytical Chemistry RAS, Kosygin 19, Moscow, 119334, RussiaUNSPECIFIED
Hviid, S Fstubbe.hviid (at) dlr.dehttps://orcid.org/0000-0003-0623-4767
Mall, UMax Plank Institute for Solar System ResearchUNSPECIFIED
Keller, H UInstitute for Geophysics and Extraterrestrial Physics, TU Braunschweig, Braunschweig, D-38106 GermanyUNSPECIFIED
Date:4 November 2019
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
DOI :10.1093/mnras/stz3093
Publisher:Oxford University Press
ISSN:0035-8711
Status:Published
Keywords:67P/Churyumov-Gerasimenko Comets Rosetta
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):R - Projekt ROSETTA Instrumente
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Deposited By: Hviid, Stubbe
Deposited On:04 Dec 2019 12:34
Last Modified:04 Dec 2019 12:34

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