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  Geomorphology of comet 67P/Churyumov–Gerasimenko

Birch, S. P. D., Tang, Y., Hayes, A. G., Kirk, R. L., Bodewits, D., Campins, H., et al. (2017). Geomorphology of comet 67P/Churyumov–Gerasimenko. Monthly Notices of the Royal Astronomical Society, 469(Suppl. 2), S50-S67. doi:10.1093/mnras/stx1096.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002E-8CAD-9 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002E-8CAE-7
Genre: Journal Article

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 Creators:
Birch, Samuel P. D., Author
Tang, Y., Author
Hayes, A. G., Author
Kirk, R. L., Author
Bodewits, D., Author
Campins, H., Author
Fernandez, Y., Author
de Bart, R. Freitas, Author
Kutsop, N. W., Author
Sierks, Holger1, Author              
Soderblom, J. M., Author
Squyres, S. W., Author
Vincent, J-B., Author
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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 MPIS_GROUPS: Planets and Comets
 MPIS_PROJECTS: ROSETTA: OSIRIS
 Abstract: We present a global geomorphological map of comet 67P/Churyumov–Gerasimenko (67P/C-G) using data acquired by the Rosetta Orbiter’s OSIRIS Narrow Angle Camera. The images used in our study were acquired between 2014 August and 2015 May, before 67P/C-G passed through perihelion. Imagery of the Southern hemisphere was included in our study, allowing us to compare the contrasting hemispheres of 67P/C-G in a single study. Our work also puts into greater context the morphologies studied in previous works, and also the morphologies observed on previously visited cometary nuclei. Relative to other nuclei, 67P/C-G appears most similar to 81P/Wild 2, with a topographically heterogeneous surface dominated by smooth-floored pits. Our mapping describes the landscapes of 67P/C-G when they were first observed by Rosetta, and our map can be used to detect changes in surface morphologies after its perihelion passage. Our mapping reveals strong latitudinal dependences for emplaced units and a highly heterogeneous surface. Layered bedrock units that represent the exposed nucleus of 67P/C-G are dominant at southern latitudes, while topographically smooth, dust covered regions dominate the Northern hemisphere. Equatorial latitudes are dominated by smooth terrain units that show evidence for flow structures. We observe no obvious differences between the comet’s two lobes, with the only longitudinal variations being the Imhotep and Hatmehit basins. These correlations suggest a strong seasonal forcing on the surface evolution of 67P/C-G, where materials are transported from the Southern hemisphere to Northern hemisphere basins over multiple orbital time-scales.

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Language(s): eng - English
 Dates: 2017-12-142017
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1093/mnras/stx1096
 Degree: -

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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 469 (Suppl. 2) Sequence Number: - Start / End Page: S50 - S67 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150