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- Properties of the 67P/Churyumov-Gerasimenko interior revealed by CONSERT radar doi link

Auteur(s): Kofman Wlodek, Herique Alain, Barbin Y., Barriot Jean-Pierre, Ciarletti Valérie, Clifford Stephen, Edenhofer Peter, Elachi Charles, Eyraud Christelle, Goutail Jean-Pierre, Heggy Essam, Jorda Laurent, Lasue Jérémie, Levasseur-Regourd Anny Chantal, Nielsen Erling, Pasquero Pierre, Preusker Frank, Puget Pascal, Plettemeier Dirk, Rogez Yves, Sierks Holger, Statz Christoph, Svedhem Hakan, Williams Iwan, Zine Sonia, Van Zyl Jakob

(Article) Publié: Science, vol. 349 p.aab0639 (2015)


Ref HAL: insu-01182590_v1
DOI: 10.1126/science.aab0639
Exporter : BibTex | endNote
Résumé:

The Philae lander provides a unique opportunity to investigate the internal structure of a comet nucleus, providing information about its formation and evolution in the early solar system. We present Comet Nucleus Sounding Experiment by Radiowave Transmission (CONSERT) measurements of the interior of Comet 67P/Churyumov-Gerasimenko. From the propagation time and form of the signals, the upper part of the “head” of 67P is fairly homogeneous on a spatial scale of tens of meters. CONSERT also reduced the size of the uncertainty of Philae’s final landing site down to approximately 21 by 34 square meters. The average permittivity is about 1.27, suggesting that this region has a volumetric dust/ice ratio of 0.4 to 2.6 and a porosity of 75 to 85%. The dust component may be comparable to that of carbonaceous chondrites.