Regional surface morphology of comet 67P/Churyumov-Gerasimenko from Rosetta/OSIRIS images: The southern hemisphere

Elmaarry, Mohamed Ramy; Thomas, Nicolas; Gracia Berná, Antonio; Pajola, M.; Lee, J.-C.; Massironi, M.; Davidsson, B.; Marchi, S.; Keller, H. U.; Hviid, S. F.; Besse, S.; Sierks, H.; Barbieri, C.; Lamy, P. L.; Koschny, D.; Rickman, H.; Rodrigo, R.; A’Hearn, M. F.; Auger, A.-T.; Barucci, M. A.; ... (2016). Regional surface morphology of comet 67P/Churyumov-Gerasimenko from Rosetta/OSIRIS images: The southern hemisphere. Astronomy and astrophysics, 593(A110), A110. EDP Sciences 10.1051/0004-6361/201628634

[img] Text
aa28634-16.pdf - Published Version
Restricted to registered users only
Available under License Publisher holds Copyright.

Download (35MB) | Request a copy

Aims. The OSIRIS camera on board the Rosetta spacecraft has been acquiring images of the comet 67P/Churyumov-Gerasimenko (67P)’s nucleus since August 2014. Starting in May 2015, the southern hemisphere gradually became illuminated and was imaged for the first time. Here we present the regional morphology of the southern hemisphere, which serves as a companion to an earlier paper that presented the regional morphology of the northern hemisphere. Methods. We used OSIRIS images that were acquired at orbits ~45−125 km from the center of the comet (corresponding to spatial resolutions of ~0.8 to 2.3 m/pixel) coupled with the use of digital terrain models to define the different regions on the surface, and identify structural boundaries accurately. Results. Seven regions have been defined in the southern hemisphere bringing the total number of defined regions on the surface of the nucleus to 26. These classifications are mainly based on morphological and/or topographic boundaries. The southern hemisphere shows a remarkable dichotomy with its northern counterpart mainly because of the absence of wide-scale smooth terrains, dust coatings and large unambiguous depressions. As a result, the southern hemisphere closely resembles previously identified consolidated regions. An assessment of the overall morphology of comet 67P suggests that the comet’s two lobes show surface heterogeneities manifested in different physical/mechanical characteristics, possibly extending to local (i.e., within a single region) scales.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences
08 Faculty of Science > Physics Institute
08 Faculty of Science > Physics Institute > NCCR PlanetS

UniBE Contributor:

Elmaarry, Mohamed Ramy; Thomas, Nicolas; Gracia Berná, Antonio; Marschall, Raphael and Pommerol, Antoine

Subjects:

500 Science > 520 Astronomy
600 Technology > 620 Engineering
500 Science > 530 Physics

ISSN:

0004-6361

Publisher:

EDP Sciences

Language:

English

Submitter:

Katharina Weyeneth-Moser

Date Deposited:

04 Jul 2017 09:10

Last Modified:

13 Mar 2018 17:01

Publisher DOI:

10.1051/0004-6361/201628634

BORIS DOI:

10.7892/boris.96927

URI:

https://boris.unibe.ch/id/eprint/96927

Actions (login required)

Edit item Edit item
Provide Feedback