Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ap%26ss..50....3b&link_type=abstract
Astrophysics and Space Science, vol. 50, no. 1, Aug. 1977, p. 3-22.
Astronomy and Astrophysics
Astrophysics
10
Astronomical Models, Comets, Hydrogen Clouds, Interstellar Gas, Oort Cloud, Density Distribution, Hydrogen Atoms, Solar Gravitation, Solar System, Space Density
Scientific paper
The arguments used by Lyttleton to prove the nonexistence of the Oort cloud are reviewed, and it is shown that Oort's hypothesis remains consistent with observation. The 1950 model of the cloud cannot be correct and, by use of the results from a number of more recent papers, an 'improved' model is described and compared with observations. It is emphasized that comparison of the predictions of theory with observations should concentrate on the a-distribution, as the 1/a-distribution masks much of the detailed structure of the theory. An order of magnitude argument is given which shows that approximately 20% of so-called 'new' comets have passed through the planetary system before, and the implications of this to the statistics of near-parabolic comet orbits are briefly investigated.
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