Regional unit definition for the nucleus of comet 67P/Churyumov-Gerasimenko on the SHAP7 model

Nicolas Thomas 1 M. El Maarry 2 P. Theologou 1 F. Preusker 3 F. Scholten 3 Laurent Jorda 4 S. Hviid 3 R. Marschall 1, 5 E. Kuhrt 3 G. Naletto 6, 7, 8 H. Sierks 9 Philippe Lamy 4, 10 R. Rodrigo 5, 11 D. Koschny 12 B. Davidsson 13 Maria Barucci 14 Jean-Loup Bertaux 10 Ivano Bertini 6 D. Bodewits 15 G. Cremonese 16 Vania da Deppo 17 S. Debei 18 M. de Cecco 19 Sonia Fornasier 14 M. Fulle 20 Olivier Groussin 4 Pedro Gutièrrez 21 C. Güttler 9 W.-H. Ip 22, 23 H. Keller 3 J. Knollenberg 3 Luisa Lara 21 M. Lazzarin 6 J. López-Moreno 21 F. Marzari 6 Cecilia Tubiana 9 J.-B. Vincent 3
Abstract : The previously defined regions on the nucleus of comet 67P/Churyumov-Gerasimenko have been mapped back onto the 3D SHAP7 model of the nucleus (Preusker et al., 2017). The resulting regional definition is therefore self-consistent with boundaries that are well defined in 3 dimensions. The facets belonging to each region are provided as supplementary material. The shape model has then been used to assess inhomogeneity of nucleus surface morphology within individual regions. Several regions show diverse morphology. We propose sub-division of these regions into clearly identifiable units (sub-regions) and a comprehensive table is provided. The surface areas of each sub-region have been computed and statistics based on grouping of unit types are provided. The roughness of each region is also provided in a quantitative manner using a technique derived from computer graphics applications. The quantitative method supports the sub-region definition by showing that differences between sub-regions can be numerically justified.
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Submitted on : Thursday, July 12, 2018 - 7:55:05 AM
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Nicolas Thomas, M. El Maarry, P. Theologou, F. Preusker, F. Scholten, et al.. Regional unit definition for the nucleus of comet 67P/Churyumov-Gerasimenko on the SHAP7 model. Planetary and Space Science, Elsevier, 2018, 164, pp.19-36. ⟨10.1016/j.pss.2018.05.019⟩. ⟨insu-01836056⟩

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