Other
Scientific paper
Sep 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.0824k&link_type=abstract
American Astronomical Society, DPS meeting #28, #08.24; Bulletin of the American Astronomical Society, Vol. 28, p.1087
Other
Scientific paper
Comets originate from the outer solar system where the density and temperature of the planetary nebula were rather low resulting in kilometer-sized pristine bodies. Therefore, the physical properties of comets will differ considerably from those of any other known solar system objects. Our present knowledge of the cometary properties is cursory and driven more by imagination than by observational facts. Landing on a cometary nucleus, as planned during the ROSETTA-mission, is of high scientific interest and will substantially improve our information on the nature and origin of comets. However, successful landing and operating the instruments is an extraordinary challenge to engineers and scientists. A wide range of uncommon and risky environmental conditions such as outgassing, a fragile surface, rain of dust grains, extreme temperature variations, complex illumination conditions, and pronounced topography have to be considered. These are described in physical terms based on model calculations ranging from simple 1D heat transfer to 2D gasdynamic acceleration of dust particles. Environmental constraints relevant for landing and operating instruments on a cometary nucleus are presented and aspects of risk reduction are discussed.
Knollenberg Jörg
Kührt Ekkehard
Uwe Keller Horst
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