| Literature DB >> 26228153 |
Wlodek Kofman1, Alain Herique1, Yves Barbin2, Jean-Pierre Barriot3, Valérie Ciarletti4, Stephen Clifford5, Peter Edenhofer6, Charles Elachi7, Christelle Eyraud8, Jean-Pierre Goutail4, Essam Heggy9, Laurent Jorda10, Jérémie Lasue11, Anny-Chantal Levasseur-Regourd12, Erling Nielsen13, Pierre Pasquero1, Frank Preusker14, Pascal Puget1, Dirk Plettemeier15, Yves Rogez1, Holger Sierks13, Christoph Statz15, Hakan Svedhem16, Iwan Williams17, Sonia Zine1, Jakob Van Zyl7.
Abstract
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.Entities:
Year: 2015 PMID： 26228153 DOI： 10.1126/science.aab0639
Source DB: PubMed Journal: Science ISSN： 0036-8075 Impact factor: 47.728