2004
DOI: 10.1051/0004-6361:20041225
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The transparency of the Solar System to the Oort cloud comets

Abstract: Abstract. In long-term Monte Carlo simulations of the dynamics of the Oort cloud planetary perturbations cannot be taken directly into account. To do this we propose a simple approximation: estimating the Solar System transparency coefficient P measuring the probability for a comet to be removed from the cloud by planetary perturbations during a single perihelion passage. We estimated the value of this coefficient from the observed and artificial cometary samples. We excluded nongravitational forces fom our ca… Show more

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Cited by 6 publications
(7 citation statements)
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“…Due to its large time span of over 30 000 years we were able to spread simulated epochs of cometary perihelion passage over this interval. As it concerns the longitude of the ascending node with respect to the Galactic disc plane the principles of this approach are described in Dybczyński (2004). In short, we consider the dominating perturbing force (the Galactic disc tide) to be axisymmetric and such a simple way of the orientation of orbits dispersion should not change qualitatively the overall dynamical evolution.…”
Section: Simulated Planetarymentioning
confidence: 99%
“…Due to its large time span of over 30 000 years we were able to spread simulated epochs of cometary perihelion passage over this interval. As it concerns the longitude of the ascending node with respect to the Galactic disc plane the principles of this approach are described in Dybczyński (2004). In short, we consider the dominating perturbing force (the Galactic disc tide) to be axisymmetric and such a simple way of the orientation of orbits dispersion should not change qualitatively the overall dynamical evolution.…”
Section: Simulated Planetarymentioning
confidence: 99%
“…To investigate the overall influence of stars on the Oort cloud comets in the recent past and at present, we decided to perform a Monte Carlo simulation of the cumulative effect of all these 21 stellar perturbers and the galactic disk tide. Planetary perturbations were also included using the "Solar System transparency coefficient" approximation (Dybczyński 2004). The motion of 2.3 × 10 7 comets was numerically integrated for 20 mln years.…”
Section: Simulated Output Of the Recent Stellar Perturbersmentioning
confidence: 99%
“…10 No comet (even Halley, concerning which we caught only one index-year paper, Saxena 2004) is worth a lot more than a small coin, because, say Neslusan & Jakubik (2005), there are at least 10 11 more waiting patiently out in the Oort Cloud. Any one that experiences a single passage through the inner solar system (as a result of encounters with giant molecular clouds, other stars, or whatever) has a 25%-50% chance of capture or complete removal (Dybczynski 2004). Such numbers, plus the inventory of Halley-like comets, lead Napier et al (2004) to conclude that the dark Halley-type comets currently outnumber the luminous ones and constitute a dangerous reservoir of potential and nearly invisible Earth-impactors.…”
Section: Cometsmentioning
confidence: 99%