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The nonmagnetic nucleus of comet 67P/Churyumov-Gerasimenko

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Title: The nonmagnetic nucleus of comet 67P/Churyumov-Gerasimenko
Authors: Carr, CM
Auster, H-U
Apathy, I
Berghofer, G
Fornacon, K-H
Remizov, A
Guettler, C
Haerendal, G
Heinisch, P
Hercik, D
Hilchenbach, M
Kuehrt, E
Magnes, W
Motschmann, U
Richter, I
Russell, C
Przyklenk, A
Schwingenschuh, K
Sierks, H
Glassmeier, K-H
Item Type: Journal Article
Abstract: Knowledge of the magnetization of planetary bodies constrains their origin and evolution, as well as the conditions in the solar nebular at that time. On the basis of magnetic field measurements during the descent and subsequent multiple touchdown of the Rosetta lander Philae on the comet 67P/Churyumov-Gerasimenko (67P), we show that no global magnetic field was detected within the limitations of analysis. The Rosetta Magnetometer and Plasma Monitor (ROMAP) suite of sensors measured an upper magnetic field magnitude of less than 2 nanotesla at the cometary surface at multiple locations, with the upper specific magnetic moment being <3.1 × 10−5 ampere–square meters per kilogram for meter-size homogeneous magnetized boulders. The maximum dipole moment of 67P is 1.6 × 108 ampere–square meters. We conclude that on the meter scale, magnetic alignment in the preplanetary nebula is of minor importance.
Issue Date: 31-Jul-2015
Date of Acceptance: 1-Apr-2015
URI: http://hdl.handle.net/10044/1/25855
DOI: 10.1126/science.aaa5102
ISSN: 0036-8075
Publisher: American Association for the Advancement of Science
Journal / Book Title: Science
Volume: 349
Issue: 6247
Copyright Statement: © 2015 The Authors. This is the peer reviewed version of the following article: The nonmagnetic nucleus of comet 67P/Churyumov-Gerasimenko Hans-Ulrich Auster, Istvan Apathy, Gerhard Berghofer, Karl-Heinz Fornacon, Anatoli Remizov, Chris Carr, Carsten Güttler, Gerhard Haerendel, Philip Heinisch, David Hercik, Martin Hilchenbach, Ekkehard Kührt, Werner Magnes, Uwe Motschmann, Ingo Richter, Christopher T. Russell, Anita Przyklenk, Konrad Schwingenschuh, Holger Sierks, and Karl-Heinz Glassmeier Science 31 July 2015: 349 (6247), aaa5102 which has been published in final form at https://dx.doi.org/10.1126/science.aaa5102. 
Sponsor/Funder: Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council [2006-2012]
Science and Technology Facilities Council (STFC)
Funder's Grant Number: ST/K001698/1
ST/K001051/1
ST/H004262/1
ST/K001051/1
ST/H002383/1
Keywords: Science & Technology
Multidisciplinary Sciences
Science & Technology - Other Topics
MAGNETIC-FIELD OBSERVATIONS
GIOTTO MAGNETOMETER EXPERIMENT
ROSETTA PLASMA CONSORTIUM
SOLAR-NEBULA
DUST
METEORITES
ENCOUNTER
ASTEROIDS
SAMPLES
GASPRA
General Science & Technology
Publication Status: Published
Article Number: aaa5102
Online Publication Date: 2015-04-14
Appears in Collections:Space and Atmospheric Physics
Physics
Faculty of Natural Sciences