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Polygonal impact craters on Ganymede

Baby, N. R. and Kenkmann, Thomas and Stephan, Katrin and Wagner, Roland (2023) Polygonal impact craters on Ganymede. EGU General Assembly 2023, 2023-04-23 - 2023-04-28, Vienna, Austria and Online. doi: 10.5194/egusphere-egu23-354.

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Official URL: https://meetingorganizer.copernicus.org/EGU23/EGU23-354.html


Polygonal impact craters (PIC) are impact craters that have at least one straight rim segment in planform. Among all impact craters, PICs represent a small percentage. They exist on both rocky and icy planetary bodies. To our knowledge no studies on PICs have been carried out for Ganymede. Here we are examining the straight segments of PICs and their relationship with adjacent lineaments or fractures. We use the global mosaic prepared by, which combines the best high-resolution images from Voyager 1, Voyager 2, Galileo and Juno spacecrafts. Despite the resolution limits and different illumination angles, we identified and mapped 459 PICs across Ganymede whose diameter range from 5 km to 153 km. PICs, which were superimposed by other craters or terrains are not considered for this study. The number of straight segments possessed by PICs ranges from 1 to 9 with quadrangular, hexagonal and octagonal shapes being most common. Most of these PICs exhibit a central peak or a pit, with a minor fraction of them showing a dome. Straight rim segments of PICs align with the linear features adjacent to them and indicate that such lineaments are not exclusively surface features but lead to a localization of deformation and influence the cratering process. Straight rim segments of PICs in the dark cratered terrain (dc) are oriented along fractures and furrows. For instance, Galileo Regio have many PICs because of the NW-SE trending furrows and a high density of faults and fractures. Here, most of the PICs have hexagonal shape with two of the straight segments parallel to the orientation of furrows and rest of the segments are at approximately perpendicular angle. Also, the presence of PICs suggests that they formed after formation of the linear features. The majority of linear features on anti-Jovian hemisphere trends in NW-SE direction while the preferred orientation of linear features on sub-Jovian hemisphere is in NE-SW direction. However, the preliminary orientation analysis of straight segments of PICs using rose diagrams does not show a preferred orientation for the anti-Jovian and sub-Jovian hemispheres.

Item URL in elib:https://elib.dlr.de/201906/
Document Type:Conference or Workshop Item (Speech)
Title:Polygonal impact craters on Ganymede
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Kenkmann, ThomasInstitute of Earth and Environmental Sciences—Geology, Albert-Ludwigs-Universität FreiburgUNSPECIFIEDUNSPECIFIED
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:EGU23-354
Keywords:Ganymede, crater, tectonics
Event Title:EGU General Assembly 2023
Event Location:Vienna, Austria and Online
Event Type:international Conference
Event Start Date:23 April 2023
Event End Date:28 April 2023
Organizer:European Geosciences Union
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):R - Project JUICE - JANUS and GALA
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geology
Deposited By: Stephan, Dr.rer.nat. Katrin
Deposited On:09 Jan 2024 08:41
Last Modified:24 Apr 2024 21:02

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