The global meter-level shape model of comet 67P/Churyumov-Gerasimenko

F. Preusker, F. Scholten, K.-D. Matz, T. Roatsch, S. F. Hviid, S. Mottola, J. Knollenberg, E. Kührt, M. Pajola, N. Oklay, J.-B. Vincent, B. Davidsson, M. F. A’Hearn, J. Agarwal, C. Barbieri, M. A. Barucci, J.-L. Bertaux, I. Bertini, G. Cremonese, V. Da Deppo, S. Debei, M. De Cecco, S. Fornasier, M. Fulle, O. Groussin, P. J. Gutiérrez, C. Güttler, W-H. Ip, L. Jorda, H. U. Keller, D. Koschny, J. R. Kramm, M. Küppers, P. Lamy, L. M. Lara, M. Lazzarin, J. J. Lopez Moreno, F. Marzari, M. Massironi, G. Naletto, H. Rickman, R. Rodrigo, H. Sierks, N. Thomas and C. Tubiana. 2017. The global meter-level shape model of comet 67P/Churyumov-Gerasimenko. Astronomy and Astrophysics 607, DOI: 10.1051/0004-6361/201731798

We performed a stereo-photogrammetric (SPG) analysis of more than 1500 Rosetta/OSIRIS NAC images of comet 67P/ChuryumovGerasimenko (67P). The images with pixel scales in the range 0.2-3.0 m/pixel were acquired between August 2014 and February 2016. We finally derived a global high-resolution 3D description of 67P’s surface, the SPG SHAP7 shape model. It consists of about 44 million facets (1-1.5 m horizontal sampling) and a typical vertical accuracy at the decimeter scale. Although some images were taken after perihelion, the SPG SHAP7 shape model can be considered a pre-perihelion description and replaces the previous SPG SHAP4S shape model. From the new shape model, some measures for 67P with very low 3 sigma uncertainties can be retrieved: 18.56 km(3) +/- 0 : 02 km(3) for the volume and 537.8 kg/m(3) +/- 0.7 kg/m(3) for the mean density assuming a mass value of 9 : 982 +/- 10(12) kg.

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