Title: COSIMA - Cometary Dust Analysis in the Inner Coma of Comet 67P/Churyumov-
Gerasimenko

Abstract:
The COmetary Secondary Ion Mass Analyser (COSIMA) is one of the scientific instruments on 
the ROSETTA spacecraft orbiting the nucleus of Jupiter-family comet 67P/Churyumov-
Gerasimenko. COSIMA is collecting cometary grains from the near-nucleus region and the inner 
coma of the comet onto special target plates, which are subsequently imaged and 
compositionally investigated. For the latter a secondary ion mass spectrometer with an indium 
ion source is used. The obtained high resolution mass spectra contain ions of complex 
mixtures of mineral compounds and organic molecules as well as molecular fragments 
representing the elements and molecules on the surface of these grains. We will report results 
of our in-situ analysis of cometary grains as captured, imaged and compositionally investigated 
by COSIMA. A special emphasis will be put on how the results of telescopic observations of 
comets can support the interpretation of the in-situ investigations. 

Co-authors:
M. Hilchenbach,  J. Kissel, C. Briois, H. Henkel, Y. Langevin, J. Silén, K. Altwegg, D. 
Baklouti, A. Bardyn, H. Cottin, C. Engrand, H. Fischer, N. Fray, A. Glasmachers, M. Godard, E. 
Grün, G. Haerendel, H. Höfner, K. Hornung, E. K. Jessberger, A. Koch, P. Lacerda, H. 
Lehto, K. Lehto, F.-R. Orthous Daunay, S. Merouane, J. Paquette, F. Raulin, L. Le Roy, J. 
Rynö, S. Siljeström, W. Steiger, T. Stephan, O. Stenzel, L. Thirkell, R. Thomas, K. Torkar, 
K. Varmuza, K. P. Wanczek, B. Zaprudin