title: COMETARY SCIENCE. The nonmagnetic nucleus of comet 67P/Churyumov-Gerasimenko.
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 × 10(8) ampere-square meters. We conclude that on the meter scale, magnetic alignment in the preplanetary nebula is of minor importance.
authors: Institut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweig, Mendelssohnstrasse 3, D-38106 Braunschweig, Germany. uli.auster@tu-bs.de.
authors: Hans-Ulrich
authors: HU
authors: Auster
authors: Centre for Energy Research, Hungarian Academy of Sciences, H-1121 Konkoly Thege Street 29-33, Budapest, Hungary.
authors: Istvan
authors: I
authors: Apathy
authors: Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, A-8042 Graz, Austria.
authors: Gerhard
authors: G
authors: Berghofer
authors: Institut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweig, Mendelssohnstrasse 3, D-38106 Braunschweig, Germany.
authors: Karl-Heinz
authors: KH
authors: Fornacon
authors: Institut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweig, Mendelssohnstrasse 3, D-38106 Braunschweig, Germany. Space Research Institute, Russian Academy of Sciences, Moscow, Profsoyuznaja Street 84/32, 117810 Moscow, Russia.
authors: Anatoli
authors: A
authors: Remizov
authors: Imperial College London, Exhibition Road, London SW7 2AZ, UK.
authors: Chris
authors: C
authors: Carr
authors: Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, D-37077 Göttingen.
authors: Carsten
authors: C
authors: Güttler
authors: Max-Planck-Institute für Extraterrestrische Physik, Giessenbachstrasse, D-85741 Garching bei München.
authors: Gerhard
authors: G
authors: Haerendel
authors: Institut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweig, Mendelssohnstrasse 3, D-38106 Braunschweig, Germany.
authors: Philip
authors: P
authors: Heinisch
authors: Institut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweig, Mendelssohnstrasse 3, D-38106 Braunschweig, Germany.
authors: David
authors: D
authors: Hercik
authors: Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, D-37077 Göttingen.
authors: Martin
authors: M
authors: Hilchenbach
authors: German Aerospace Center (DLR), Institute of Planetary Research, D-12489 Berlin, Rutherfordstrasse 2, Germany.
authors: Ekkehard
authors: E
authors: Kührt
authors: Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, A-8042 Graz, Austria.
authors: Werner
authors: W
authors: Magnes
authors: German Aerospace Center (DLR), Institute of Planetary Research, D-12489 Berlin, Rutherfordstrasse 2, Germany. Institut für Theoretische Physik, Technische Universität Braunschweig, Mendelssohnstrasse 3, D-38106 Braunschweig, Germany.
authors: Uwe
authors: U
authors: Motschmann
authors: Institut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweig, Mendelssohnstrasse 3, D-38106 Braunschweig, Germany.
authors: Ingo
authors: I
authors: Richter
authors: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095-1567, USA.
authors: Christopher T
authors: CT
authors: Russell
authors: Institut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweig, Mendelssohnstrasse 3, D-38106 Braunschweig, Germany.
authors: Anita
authors: A
authors: Przyklenk
authors: Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, A-8042 Graz, Austria.
authors: Konrad
authors: K
authors: Schwingenschuh
authors: Max-Planck-Institute für Extraterrestrische Physik, Giessenbachstrasse, D-85741 Garching bei München.
authors: Holger
authors: H
authors: Sierks
authors: Institut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweig, Mendelssohnstrasse 3, D-38106 Braunschweig, Germany. Max-Planck-Institute für Extraterrestrische Physik, Giessenbachstrasse, D-85741 Garching bei München.
authors: Karl-Heinz
authors: KH
authors: Glassmeier