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Temporal morphological changes in the Imhotep region of comet 67P/Churyumov-Gerasimenko
Aix Marseille Univ, CNRS, UMR 7326, LAM, F-13388 Marseille, France..
Max Planck Inst Sonnensyst Forsch, D-37077 Gottingen, Germany..
Univ Padua, Dept Phys & Astron, I-35122 Padua, Italy..
Aix Marseille Univ, CNRS, UMR 7326, LAM, F-13388 Marseille, France..
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2015 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 583, A36Article in journal (Refereed) Published
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Abstract [en]

Aims. We report on the first major temporal morphological changes observed on the surface of the nucleus of comet 67P/Churyumov-Gerasimenko in the smooth terrains of the Imhotep region. Methods. We used images of the OSIRIS cameras onboard Rosetta to follow the temporal changes from 24 May 2015 to 11 July 2015. Results. The morphological changes observed on the surface are visible in the form of roundish features that are growing in size from a given location in a preferential direction at a rate of 5.6-8.1 x 10(-5) m s(-1) during the observational period. The location where the changes started and the contours of the expanding features are bluer than the surroundings, which suggests that ices (H2O and/or CO2) are exposed on the surface. However, sublimation of ices alone is not sufficient to explain the observed expanding features. No significant variations in the dust activity pattern are observed during the period of changes.

Place, publisher, year, edition, pages
2015. Vol. 583, A36
Keyword [en]
comets: individual: 67P/Churyumov-Gerasimenko, comets: general, methods: data analysis
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-270604DOI: 10.1051/0004-6361/201527020ISI: 000365072200136OAI: oai:DiVA.org:uu-270604DiVA: diva2:890257
Funder
Swedish National Space Board
Available from: 2016-01-01 Created: 2016-01-01 Last updated: 2017-12-01Bibliographically approved

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Rickman, HansDavidsson, Björn

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