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jjswaim schrieb:

> "It laps it," explained Richard Greenberg, an astronomer at the
> University of Arizona. "Time and time again they line up exactly
> at the same position. They have a gravitational effect at the same
> point, every time."

> Greenberg said the finding helps astronomers explain how
> the population of near-Earth asteroids is replenished.

> Greenberg, who wrote a commentary about the findings, said scientists
> had always assumed that weaker resonances were not strong enough to
> affect the asteroids.

> Greenberg said the phenomenon could also explain meteorites, which
> are pieces of asteroids. The name meteorite, he pointed out, comes
> from the same word for meteorology.

Hello Julia and List,

Here are some useful references:

Aoki S. (1978) Stability problem of Kirkwood gaps (Nature 257: 568).

Brouwer D. (1963) The problem of the Kirkwood gaps in the asteroid belt
(Astron J. 68:

Chapman C.R. et al. (1978) The asteroids (Ann. Rev.Astron. Astrophys.,
eds. G. Burbidge et al. Vol. 16, pp, 33-75).

Danielsson L. (1978) The orbital resonances between the asteroid Toro
and the Earth and Venus (Moon and Planets 18: 265-272.

Danielsson L. et al. (1972) Capture resonance of the asteroid 1685 Toro
by the Earth (Science 176: 906-907).
Dohnanyi J.S. (1969) Collisional model of asteroids and their debris (J.
Geophys. Res. 74: 2531-2554).

Franklin F.A. et al. (1975) Minor planets and comets in libration about
the 2:1 resonance with Jupiter (Astron. J. 80: 729-746).

Froeschlé C.  et al. (1976) On the dynamical topology of the Kirkwood
gaps (Astron. Astrophys. 48: 389-393).

Froeschlé C.  et al. (1977) A qualitative comparison between the
circular and elliptic Sun-Jupiter-Asteroid problem at commensurabilities
(Astron. Astrophys. 57: 33-39).

Froeschlé C.  et al. (1979) New numerical experiments to deplete the
outer part of the asteroidal belt (Astron, Astrophys. 72: 246-255).

Giffen R. (1973) A study of commensurable motion in the asteroidal belt
(Astron. Astrophys. 23: 387-403).

Goldreich P. et al. (1973) The formation of planetesimals (Astrophys. J.
183: 1051-1061).

Greenberg  R. (1977) Orbit-orbit resonances in the solar system:
Varieties and similarities (Vistas in Astronomy 21: 209-239).

Grecnberg R. (1978) Orbital resonance in a dissipative medium (Icarus
33: 62-73)

Greenberg R. et al. (1977) Size distribution of particles in planetary
rings (Icarus 30: 769-779).

Greenberg R. et al. (....) Resonances in the asteroid belt (in
Asteroids, ed. By T. Gehrels, 1979, Univ. of AZ Press, pp. 310-333).

Greenberg R. et al. (1975) Coupled librations in the motions of
asteroids near the 2:1 resonance (Mon. Not. Roy. Astron. Soc. 173: 1-8).

Heppenheimer T.A. (1975a) Adiabatic invariants and phase equilibria for
first-order orbital resonances (Astron. J. 80: 465-472).

Heppenheimer T.A. (1975b) On the alleged collisional origin of the
Kirkwood gaps (Icarus 26: 367-376).

Heppenheimer T.A. (1978) On the origin of the Kirkwood gaps and of
satellite-satellite resonances (Astron. Astrophys. 70: 457-465).

Heppenheimer T.A. (1979) Secular resonances and the early history of the
solar system (Icarus).

Janiczek P.M. et al. (1972) Resonances and encounters in the inner solar
system (Astron. J. 77: 764-773).

Jefferys W.H. (1967) Nongravitational forces and resonances in the solar
system (Astron. J. 72: 872-875).

IPATOV S.I. (1992) Evolution of asteroidal orbits at the 5:2 resonance
(Icarus 95, 100-114).

KNEZEVIC Z. et al. (1991) Secular Resonances from 2 to 50 AU (Icarus 93,

MIGLIORINI F. et al. (1997) Vesta fragments from v6 and 3:1 resonances:
Implications for V-type near-Earth asteroids and howardite, eucrite and
diogenite meteorites (Meteoritics 32-6, 1997, 903).

Best regards,


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