The reality of comet groups and pairs

Details The reality of comet groups and pairs The reality of comet groups and pairs

Apr 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977icar...30..736w&link_type=abstract

Icarus, vol. 30, Apr. 1977, p. 736-746.

Mathematics

Probability

6

Astronomical Models, Comets, Orbital Elements, Monte Carlo Method, Probability Theory, Saturn (Planet), Solar Orbits

Scientific paper

Although the common genetic origin of the Kreutz family of sun-grazing comets has generally been accepted, there remains uncertainty with regard to genetic identity among other groups of comets whose orbital elements are nearly alike. Porter (1952) has listed a number of such groups, and Opik (1971) has made a statistical study of the orbits of 472 comets with aphelion distances beyond Saturn. Opik lists 97 groups that show similarities among their three angular elements, calculates an overall probability of some 10 to the -39th power that these similarities could have occurred by chance, and thus concludes that 60% or more of such comets fall into genetic groups containing from two to seven members. This paper explores the statistical reality of Opik's groups utilizing the Monte Carlo method of statistics as well as ordinary probability theory. The conclusion is reached that except for a few pairs, the similarity among orbital elements within the groups is no greater than random expectation.

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