Close approaches of asteroid 1999 AN10: resonant and non-resonant returns

Details Close approaches of asteroid 1999 AN10: resonant and non-resonant returns Close approaches of asteroid 1999 AN10: resonant and non-resonant returns

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...346l..65m&link_type=abstract

Astronomy and Astrophysics, v.346, p.L65-L68 (1999)

Astronomy and Astrophysics

Astrophysics

21

Minor Planets, Asteroids, Chaos

Scientific paper

The Earth passes very close to the orbit of the asteroid 1999 AN10 twice per year, but whether or not this asteroid can have a close approach depends upon the timing of its passage across the ecliptic plane. Among the possible orbits there are some with a close approach in 2027. The period of the asteroid may be perturbed in such a way that it returns to an approach to the Earth at either of the possible encounter points. We have developed a theory which successfully predicts the 25 possible such returns up to 2040. We have also identified 6 more close approaches resulting from the cascade of successive returns. Because of this extremely chaotic behaviour there is no way to predict all possible approaches for more than a few decades after any close encounter, but the orbit will remain dangerously close to the orbit of the Earth for about 600 years.

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