COSIMA at Comet 67P/Churyumov-Gerasimenko After Perihelion

Wednesday, 16 December 2015
Poster Hall (Moscone South)
John Anthony Paquette1, Nicolas Altobelli2, Kathrin Altwegg3, Christelle Briois4, Luigi Colangeli5, Hervé Cottin6, Donia Baklouti7, Anais Bardyn4, Cécile Engrand8, Henning Fischer9, Nicolas Fray6, Albrecht Glasmachers10, Eberhard Gruen11, Marie Godard12, Gerhard Haerendel13, Hartmut Henkel14, Martin Hilchenbach9, Hanna von Hoerner15, Herwig Höfner13, Klaus Hornung16, Elmar Jessberger17, Jochen Kissel1, Andreas Koch14, Pedro Lacerda9, Yves Langevin8, Harry Lehto18, Kirsi Lehto18, Lena Le Roy19, Nicolas Ligier7, Philippe Martin4, Sihane Merouane9, François-Régis Orthous-Daunay20, Francois Raulin6, Claire Revillet4, Jouni Rynö21, Rita Schulz22, Johan V Silen21, Sandra Siljeström23, Wolfgang Steiger24, Oliver Stenzel9, Thomas Stephan25, Laurent Thirkell4, Roger Thomas26, Klaus Torkar27, Kurt Varmuza28, Karl-Peter Wanczek29, Zhong-Yi Lin30 and Boris Zaprudin18, (1)Max Planck Institute for Solar System Research, Katlenburg-Lindau, Germany, (2)European Space Agency, Villanueva de la Canada, Spain, (3)University of Bern, Bern, Switzerland, (4)Laboratoire de Physique et Chimie de l'Environnement et de l'Espace, LPC2E, Orléans Cedex 2, France, (5)ESA-ESTEC, Noordwijk, Netherlands, (6)LISA Laboratoire Interuniversitaire des Systèmes Atmosphériques, CRETEIL, France, (7)IAS Institut d'Astrophysique Spatiale, Orsay Cedex, France, (8)CNRS, Paris Cedex 16, France, (9)Max Planck Institute for Solar System Research, Planets and Comets, Goettingen, Germany, (10)Universität Wuppertal, 42119 Wuppertal, Germany, (11)MPIK / Max-Planck-Institut für Kernphysik, Heidelberg, Germany, (12)Centre de Sciences Nucléaires et de Sciences de la Matiere - CSNSM, 91405 Orsay, France, (13)The Max Planck Institute for Extraterrestrial Physics, Garching, Germany, (14)von Hoerner und Sulger GmbH, 68723 Schwetzingen, Germany, (15)von Hoerner und Sulger GmbH, Schwetzingen, Germany, (16)Universität der Bundeswehr, 85577 Neubiberg, Germany, (17)Institut für Planetologie, 48149 Münster, Germany, (18)University of Turku, Turku, Finland, (19)University of Bern, Center for Space and Habitability, Bern, Switzerland, (20)IPAG - Institut de Planetologie et d'Astrophysique de Grenoble, Grenoble, France, (21)Finnish Meteorological Institute, Helsinki, Finland, (22)European Space Research and Technology Centre, Noordwijk, Netherlands, (23)SP Technical Research Institute of Sweden, Borås, Sweden, (24)RC Seibersdorf Research GmbH, 2444 Seibersdorf, Austria, (25)The University of Chicago, Chicago, United States, (26)Laboratoire de Physique et Chimie de l'Environnement et de l'Espace, CNRS / Université d’Orléans, 45071 Orléans, France, (27)Austrian Academy of Sciences, Graz, Austria, (28)Technische Universität Wien, Wien, Austria, (29)Universität Bremen, 28357 Bremen, Germany, (30)NCU National Central University of Taiwan, Jhongli, Taiwan
COSIMA (the COmetary Secondary Ion Mass Analyser) is one of the three scientific in-situ dust instruments onboard the Rosetta spacecraft [1]. Rosetta has been orbiting comet 67P/Churyumov-Gerasimenko since August of 2014. COSIMA is collecting cometary dust particles in the inner coma by exposing metal targets. It then images the targets periodically with COSISCOPE, a microscope/camera, in search of the captured particles. A variety of particle morphologies are seen. A sample particle is shown in Figure 1.

Some of the identified cometary particles are further investigated by SIMS (Secondary Ion Mass Spectrometry). The high resolution mass spectra show the presence of positive or negative ions of elements, organic molecules and molecular fragments originating from the selected grain surface. Changes in dust characteristics with time will be discussed.

[1] Kissel et al. (2007), Sp. Sci. Rev. 128, 823-867. [2] Schulz et al. (2015), Nature, 518, 216-218.

Figure 1:A cometary particle collected by COSIMA [2]