Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...204..313o&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 204, no. 1-2, Oct. 1988, p. 313-316.
Astronomy and Astrophysics
Astrophysics
2
Asteroids, Elliptical Orbits, Jupiter (Planet), Orbital Lifetime, Orbital Mechanics, Amor Asteroid, Apollo Asteroids, Comets, Meteoroids, Orbital Elements
Scientific paper
The characteristic lifetimes against certain new orbits being attained as a result of close encounters with Jupiter are calculated for four asteroids whose orbits cross that of the planet: 5025 P-L (an Apollo-type object), 1982 YA, (3352) 1983 SA, and 1986 RA (Amor-type objects). It is shown that the dynamical loss of such objects is dominated by ejections form the solar system, which occurs on a time-scale of 5×105 to 2×106yr. Close approaches to Jupiter occur on a time-scale of just 100 - 600 yr, and many of these approaches will cause substantial changes in the orbital elemts of the asteroids: e.g. a positive or negative change of 0.1 AU in the perihelion distance may occur as a result of 20 - 30% of all encounters, and the time-scale for the three Amors becoming Apollos is only 103 - 104yr. If these asteroids are in fact dormant comets then they might be re-activated by severe reductions in their perihelion distances since increased insolation would then occur.
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