Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...307..310m&link_type=abstract
Astronomy and Astrophysics, v.307, p.310
Astronomy and Astrophysics
Astrophysics
38
Asteroids, Celestial Mechanics
Scientific paper
We study the dynamics of the Kozai resonance for Near-Earth-Asteroids (NEAs) having semimajor axes a<2AU, using both purely numerical integrations and a semi-analytical approach. For the first time, we show that due to the interaction with the terrestrial planets, the Kozai resonance may occur even at low inclinations, with the argument of perihelion ω librating around 0deg or 180deg. As in the main asteroid belt, we also find the Kozai resonance at work at high inclinations, with ω librating around 90deg or 270deg. In both cases, the resonance provides a (temporary) protection mechanism from close planetary encounters. As a consequence, a NEA locked in the Kozai resonance is in a meta-stable state, where it can stay for a comparatively long time before a close approach with a planet drastically changes its orbit. We have also found some cases of objects locked at the same time in the Kozai resonance and in other mean motion or secular resonances.
Michel Pascal
Thomas Frank
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