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 DeppoS. 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, C. Tubiana

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Abstract

We performed a stereo-photogrammetric (SPG) analysis of more than 1500 Rosetta/OSIRIS NAC images of comet 67P/Churyumov-Gerasimenko (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-periheliondescription and replaces the previous SPG SHAP4S shape model. From the new shape model, some measures for 67P with very low 3σ uncertainties can be retrieved: 18.56 km3 ± 0.02 km3 for the volume and 537.8 kg/m3 ± 0.7 kg/m3 for the mean density assuming a mass value of 9.982 × 1012 kg.

Original languageEnglish
Article numberL1
JournalAstronomy and Astrophysics
Volume607
DOIs
StatePublished - 1 Nov 2017

Keywords

  • Comets: individual: 67P/Churyumov-Gerasimenko
  • Methods: data analysis
  • Planets and satellites: surfaces
  • Techniques: image processing

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