Physics
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.301..201d&link_type=abstract
Nature, vol. 301, Jan. 20, 1983, p. 201-205.
Physics
47
Asteroid Belts, Eccentric Orbits, Gravitational Effects, Librational Motion, Orbit Perturbation, Jupiter (Planet), Mass Distribution, Orbit Calculation, Solar Orbits, Statistical Analysis, Asteroids, Kirkwood Gaps, Distribution, Orbits, Eccentricities, Width, Inclination, Resonance, Observations, Data, Calculations, Librations, Regions, Formation, Hypotheses, Statistical Analysis, Gravity Effects, Collisions, Jupiter, Structure
Scientific paper
It is demonstrated that the Kirkwood gaps are not merely regions of low asteroidal number density, but are regions in a-e-sin 1/2 I space where libration of some argument is possible. It is argued that neither the statistical nor the cosmogonic hypothesis of gap formation can account for these new observations. It is shown that the present distribution of asteroidal semimajor axes can be used to deduce the present semimajor axis of Jupiter to an accuracy of one part in five thousand. Thus, there has been very little change in the orbital period of Jupiter since the time of formation of the present gaps. This observation eliminates the possibility that the observed gaps were formed by resonance sweeping at the time of the dispersal of the accretion disk. It is concluded that the gaps have been formed by the gravitational action of Jupiter on individual asteroids and that gap formation has probably continued throughout the lifetime of the solar system.
Dermott Stanley F.
Murray Carl D.
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