Mechanical and SEM Analysis of Artificial Comet Nucleus Samples

Details Mechanical and SEM Analysis of Artificial Comet Nucleus Samples Mechanical and SEM Analysis of Artificial Comet Nucleus Samples

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997arcn.rept..341t&link_type=abstract

Analysis of Returned Comet Nucleus Samples, Proceedings of a Workshop held at Milpitas, California, 16-18 January, 1989. Compil

Physics

Comet Nuclei, Simulation, Irradiation, Ice, Water, Mixtures, Comets, Cosmic Dust, Galactic Structure, Crusts, Space Simulators, Experiment Design, Structural Properties (Geology), Energy Budgets, Targets, Surface Properties

Scientific paper

In 1987 approx. 20 scientists from different disciplines started a 6 year program (KOSI) to simulate physically and chemically relevant processes of cometary nuclei. The experiments are mainly carried out in two simulation chambers of the German Aerospace Research Establishment, DLR at Cologne and FRG. Experiments in the Big Space Simulator are dedicated to effects and processes induced by artificial solar irradiation (approx. 1 solar constant) on a 30 cm diameter model comet of well-defined properties. Supporting investigations are performed in a smaller space simulation chamber with ice-dust targets of typically 10 cm diameter. Several groups of theorists who are part of the KOSI-team process the experimental results and provide relevant boundary conditions for the design of new experiments. The main objective of these studies is a better understanding of: (1) the temperature behaviour of ice-dust mixtures under given irradiation conditions; (2) the total mass and energy budget of the target; (3) the mobilization of material (dust and gas) within the target body; and (4) physical and chemical alterations of the sample as a function of the experimental parameters, especially, crust formation, gas emission, dust emission and dust properties, and gas-dust interaction. The KOSI-project is intended to allow a better interpretation of ground based and space mission gained cometary data and to support the planning of future sample return missions.

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