| Literature DB >> 26228152 |
T Spohn1, J Knollenberg2, A J Ball3, M Banaszkiewicz4, J Benkhoff3, M Grott2, J Grygorczuk4, C Hüttig2, A Hagermann5, G Kargl6, E Kaufmann5, N Kömle6, E Kührt2, K J Kossacki7, W Marczewski4, I Pelivan2, R Schrödter2, K Seiferlin8.
Abstract
Thermal and mechanical material properties determine comet evolution and even solar system formation because comets are considered remnant volatile-rich planetesimals. Using data from the Multipurpose Sensors for Surface and Sub-Surface Science (MUPUS) instrument package gathered at the Philae landing site Abydos on comet 67P/Churyumov-Gerasimenko, we found the diurnal temperature to vary between 90 and 130 K. The surface emissivity was 0.97, and the local thermal inertia was 85 ± 35 J m(-2) K(-1)s(-1/2). The MUPUS thermal probe did not fully penetrate the near-surface layers, suggesting a local resistance of the ground to penetration of >4 megapascals, equivalent to >2 megapascal uniaxial compressive strength. A sintered near-surface microporous dust-ice layer with a porosity of 30 to 65% is consistent with the data.Entities:
Year: 2015 PMID： 26228152 DOI： 10.1126/science.aab0464
Source DB: PubMed Journal: Science ISSN： 0036-8075 Impact factor: 47.728