Spectrophotometry of the Khonsu region on the comet 67P/Churyumov–Gerasimenko using OSIRIS instrument images

Deshapriya, J. D. P.; Barucci, M. A.; Fornasier, S.; Feller, C.; Hasselmann, P. H.; Sierks, H.; El-Maarry, M.R.; Pajola, M.; Barbieri, C.; Lamy, P. L.; Rodrigo, R.; Koschny, D.; Rickman, H.; Agarwal, J.; A'Hearn, M. F.; Bertaux, J.-L.; Bertini, I.; Boudreault, S.; Cremonese, G.; Da Deppo, V.; ... (2016). Spectrophotometry of the Khonsu region on the comet 67P/Churyumov–Gerasimenko using OSIRIS instrument images. Monthly notices of the Royal Astronomical Society, 462(Suppl 1), S274-S286. Oxford University Press 10.1093/mnras/stw2530

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Our work focuses on the spectrophotometric analysis of selected terrain and bright patches in the Khonsu region on the comet 67P/Churyumov–Gerasimenko. Despite the variety of geological features, their spectrophotometric properties appear to indicate a similar composition. It is noticeable that the smooth areas in Khonsu possess similar spectrophotometric behaviour to some other regions of the comet. We observed bright patches on Khonsu with an estimation of >40 per cent of normal albedo and suggest that they are associated with H2O ice. One of the studied bright patches has been observed to exist on the surface for more than 5 months without a major decay of its size, implying the existence of potential sub-surface icy layers. Its location may be correlated with a cometary outburst during the perihelion passage of the comet in 2015 August, and we interpret it to have triggered the surface modifications necessary to unearth the stratified icy layers beneath the surface. A boulder analysis on Khonsu leads to a power-law index of −3.1 +0.2/−0.3 suggesting a boulder formation, shaped by varying geological processes for different morphological Units.

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

UniBE Contributor:

Thomas, Nicolas

Subjects:

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

ISSN:

0035-8711

Publisher:

Oxford University Press

Language:

English

Submitter:

Katharina Weyeneth-Moser

Date Deposited:

04 Jul 2017 08:41

Last Modified:

04 Jul 2017 08:41

Publisher DOI:

10.1093/mnras/stw2530

BORIS DOI:

10.7892/boris.96918

URI:

https://boris.unibe.ch/id/eprint/96918

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