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The aging and lifetimes of comets

Published online by Cambridge University Press:  12 April 2016

Lubor Kresák
Lubor Kresák*
Affiliation:
Astronomical Institute, Slovak Academy of Sciences, 84228 Bratislava, Czechoslovakia

Abstract

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The aging of comets is evidenced by a number of observable phenomena: production of gas, dust and meteor particles, splitting of cometary nuclei, nongravitational effects in the comet’s motion, sudden and progressive absolute brightness variations, and ultimate disappearance. Statistical data on comet losses, absolute magnitudes and orbits also bear signatures of their aging. The knowledge of potential active lifetimes of individual objects is a prerequisite of any realistic model of the long-term evolution of the whole comet complex. This paper reviews different sources of information on the aging process and summarizes implications for the mean lifetimes of comets, their dispersion and dependence on the orbital parameters. Two alternative end fates of comets - their total disintegration or change into an inactive asteroid-like object - are also discussed.

Type
Section V. Dynamics of Comets
Information
International Astronomical Union Colloquium , Volume 83: Dynamics of Comets: Their Origin and Evolution , 1985 , pp. 279 - 302
Copyright
Copyright © Cambridge University Press 1985

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