Diversity of Comets: Formation Zones and Dynamical Paths View Full Text


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Article Info

DATE

1999-10

AUTHORS

Paul R. Weissman

ABSTRACT

The past dozen years have produced a new paradigm with regard to the source regions of comets in the early solar system. It is now widely recognized that the likely source of the Jupiter-family short-period comets (those with Tisserand parameters, T > 2 and periods, P, generally < 20 years) is the Kuiper belt in the ecliptic plane beyond Neptune. In contrast, the source of the Halley-type and long-period comets (those with T < 2 and P > 20 years) appears to be the Oort cloud. However, the comets in the Oort cloud almost certainly originated elsewhere, since accretion is very inefficient at such large heliocentric distances. New dynamical studies now suggest that the source of the Oort cloud comets is the entire giant planets region from Jupiter to Neptune, rather than primarily the Uranus-Neptune region, as previously thought. Some fraction of the Oort cloud population may even be asteroidal bodies formed inside the orbit of Jupiter. These comets and asteroids underwent a complex dynamical random walk among the giant planets before they were ejected to distant orbits in the Oort cloud, with possible interesting consequences for their thermal and collisional histories. Observational evidence for diversity in cometary compositions is limited, at best. More... »

PAGES

301-311

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1023/a:1005278905101

DOI

http://dx.doi.org/10.1023/a:1005278905101

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1044811172


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