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  Quantitative analysis of isolated boulder fields on comet 67P/Churyumov-Gerasimenko

Cambianica, P., Cremonese, G., Naletto, G., Lucchetti, A., Pajola, M., Penasa, L., et al. (2019). Quantitative analysis of isolated boulder fields on comet 67P/Churyumov-Gerasimenko. Astronomy and Astrophysics, 630: A15. doi:10.1051/0004-6361/201834775.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-09ED-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-09EE-6
Genre: Journal Article


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Cambianica, P., Author
Cremonese, G., Author
Naletto, G., Author
Lucchetti, A., Author
Pajola, M., Author
Penasa, L., Author
Simioni, E., Author
Massironi, M., Author
Ferrari, S., Author
Bodewits, D., Author
La Forgia, F., Author
Sierks, Holger1, Author              
Lamy, P. L., Author
Rodrigo, R., Author
Koschny, D., Author
Davidsson, B., Author
Barucci, M. A., Author
Bertaux, J.-L., Author
Bertini, I., Author
Da Deppo, V. , Author
Debei, S., AuthorDe Cecco, M. , AuthorDeller, Jakob1, Author              Fornasier, S., AuthorFulle, M., AuthorGutiérrez, P. J., AuthorGüttler, Carsten1, Author              Ip, W.-H., AuthorKeller, H. U., AuthorLara, L. M., AuthorLazzarin, M., AuthorLin, Z.-Y., AuthorLópez-Moreno, J. J., AuthorMarzari, F., AuthorMottola, S., AuthorShi, Xian1, Author              Scholten, F., AuthorToth, I., AuthorTubiana, Cecilia1, Author              Vincent, J.-B., Author more..
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              


Free keywords: comets: general comets: individual: 67P/Churyumov-Gerasimenko methods: data analysis
 Abstract: Aims. We provide a detailed quantitative analysis of isolated boulder fields situated in three different regions of comet 67P/Churyumov-Gerasimenko: Imhotep, Hapi, and Hatmehit. This is done to supply a useful method for analyzing the morphology of the boulders and to characterize the regions themselves. Methods. We used OSIRIS Narrow Angle Camera images with a spatial scale smaller than 2 m px−1 and analyzed the size-frequency distribution and the cumulative fractional area per boulder population. In addition, we correlated shape parameters, such as circularity and solidity, with both the spatial and the size-frequency distribution of the three populations. Results. We identified 11 811 boulders in the Imhotep, Hapi, and Hatmehit regions. We found that the Hatmehit and Imhotep areas show power indices in the range of −2.3/−2.7. These values could represent a transition between gravitational events caused by thermal weathering and sublimation, and material formed during collapses that has undergone sublimation. The Hapi area is characterized by a lower power index (−1.2/−1.7), suggesting that those boulders have a different origin. They can be the result of material formed during gravitational events and collapses that has undergone continuous fragmentation. We calculated the cumulative fractional area (CFA) in order to investigate how the area is covered by boulders as a function of their sizes. The Hatmehit and Imhotep regions show a CFA that is well fit by a power law. In contrast, the Hapi area does not show the same trend. We analyzed the fractal distributions, finding that the populations seem to be fractal at all dimensions, except for the Hapi distribution, which shows a possible fractal behavior for small dimensions only. Finally, the average values of the shape parameters reveal solid and roundish boulders in all populations we studied.


Language(s): eng - English
 Dates: 2019
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1051/0004-6361/201834775
 Degree: -



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Source 1

Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
Publ. Info: Les Ulis Cedex A France : EDP Sciences
Pages: - Volume / Issue: 630 Sequence Number: A15 Start / End Page: - Identifier: Other: 1432-0746
ISSN: 0004-6361
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1