Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18..245g&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 18, Feb. 1991, p. 245-248. Research supported by DFG.
Astronomy and Astrophysics
Astronomy
24
Carbon Dioxide, Comet Nuclei, Comet Tails, Ice, Solidified Gases, Astronomical Photography, Interplanetary Dust, Space Observations (From Earth), Comets, Laboratory Studies, Experiments, Simulations, Comet Nuclei, Procedure, Samples, Analogs, Heat, Transport, Composition, Structure, Dust, Gases, Techniques, Ice, Equipment, Porosity, Carbon Dioxide, Water
Scientific paper
Recent efforts to simulate comet morphology and evolution in the laboratory are reviewed, with an emphasis on the KOSI project using the Space Simulator at DLR Koeln. In KOSI, 30-cm-diameter 15-cm-thick specimens of water ice mixed with frozen CO2, methanol, and/or dust (mixtures of olivine, montmorillonite, kaolinite, and carbon) are exposed to Xe-lamp irradiation at temperature 77 K and pressure 100 microPa. Preliminary findings from KOSI experiments include measurements of the time lag between the onset of insolation and the release of gases and observations of (1) heat conduction by sublimating gases within the sample, (2) compositional fractionation, (3) emission of icy grains at speeds of a few m/sec, and (4) gas compositions significantly different from the original sample composition.
Grün Eberhard
Kochan Hermann
Seidensticker Klaus J.
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