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Geomorphology of the Imhotep region on comet 67P/Churyumov-Gerasimenko from OSIRIS observations
Aix Marseille Univ, CNRS, UMR 7326, LAM, F-13388 Marseille, France..
Aix Marseille Univ, CNRS, UMR 7326, LAM, F-13388 Marseille, France..
Univ Paris 11, Lab GEOPS, Geosci Paris Sud, F-91405 Orsay, France.;Inst Mecan Celeste & Calcul Ephemerides, UMR 8028, F-75014 Paris, France..
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2015 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 583, A35Article in journal (Refereed) PublishedText
Abstract [en]

Context. Since August 2014, the OSIRIS Narrow Angle Camera (NAC) onboard the Rosetta spacecraft has acquired high spatial resolution images of the nucleus of comet 67P/Churyumov-Gerasimenko, down to the decimeter scale. This paper focuses on the Imhotep region, located on the largest lobe of the nucleus, near the equator. Aims. We map, inventory, and describe the geomorphology of the Imhotep region. We propose and discuss some processes to explain the formation and ongoing evolution of this region. Methods. We used OSIRIS NAC images, gravitational heights and slopes, and digital terrain models to map and measure the morphologies of Imhotep. Results. The Imhotep region presents a wide variety of terrains and morphologies: smooth and rocky terrains, bright areas, linear features, roundish features, and boulders. Gravity processes such as mass wasting and collapse play a significant role in the geomorphological evolution of this region. Cometary processes initiate erosion and are responsible for the formation of degassing conduits that are revealed by elevated roundish features on the surface. We also propose a scenario for the formation and evolution of the Imhotep region; this implies the presence of large primordial voids inside the nucleus, resulting from its formation process.

Place, publisher, year, edition, pages
2015. Vol. 583, A35
Keyword [en]
comets: individual: 67P/Churyumov-Gerasimenko, methods: data analysis
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:uu:diva-270456DOI: 10.1051/0004-6361/201525947ISI: 000365072200035OAI: oai:DiVA.org:uu-270456DiVA: diva2:895423
Available from: 2016-01-19 Created: 2015-12-28 Last updated: 2016-01-19Bibliographically approved

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