Mathematics – Dynamical Systems
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250b.403c&link_type=abstract
In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 2: Dust and Nucleus p 403-408 (SEE N
Mathematics
Dynamical Systems
3
Astronomical Models, Comets, Meteoroids, Protoplanets, Dynamical Systems, Oort Cloud, Steady State, Stochastic Processes
Scientific paper
The dynamical properties of the comet system appear at present to be explicable within two broad theoretical frameworks: either (1) an Oort cloud with a heavy core separately replenishing the long and short period populations (the steady state model), or (2) a standard Oort cloud which is occasionally replenished from an external source and which is otherwise depleted as it intermittently supplies the short period population (the stochastically variable model). At the same time, two classes of theory exist in which the primary solid condensations in star-forming regions are either (a) unprocessed planetesimals or (b) processed parent bodies. The combinations (1a) and (2b) are contrasted in the light of recent findings, especially the evidence for meteoroidal activity during the past 1500 years. It seems that the stochastically variable model involving processed giant comets is in better accord with the facts.
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