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- W2593098461 abstract "The population of known minor bodies in retrograde orbits (i > 90°) that are classified as asteroids is still growing. The aim of our study was to estimate the dynamical lifetimes of these bodies using the latest observational data, including astrometry and physical properties. We selected 25 asteroids with the best-determined orbital elements. We studied their dynamical evolution in the past and future for ±100 Myr (±1 Gyr for three particular cases). We first used orbit determination and cloning to produce swarms of test particles. These swarms were then input into long-term numerical integrations, and the orbital elements were averaged. Next, we collected the available thermal properties of our objects and we used them in an enhanced dynamical model with Yarkovsky forces. We also used a gravitational model for comparison. Finally, we estimated the median lifetimes of 25 asteroids. We found three objects whose retrograde orbits were stable with a dynamical lifetime τ ∼ 10–100 Myr. A large portion of the objects studied displayed smaller values of τ (τ ∼ 1 Myr). In addition, we studied the possible influence of the Yarkovsky effect on our results. We found that the Yarkovsky effect can have a significant influence on the lifetimes of asteroids in retrograde orbits. Because of the presence of this effect, it is possible that the median lifetimes of these objects are extended. Additionally, the changes in orbital elements, caused by Yarkovsky forces, appear to depend on the integration direction. To explain this more precisely, the same model based on new physical parameters, determined from future observations, will be required." @default.
- W2593098461 created "2017-03-16" @default.
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- W2593098461 date "2017-04-28" @default.
- W2593098461 modified "2023-10-14" @default.
- W2593098461 title "Dynamical lifetimes of asteroids in retrograde orbits" @default.
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- W2593098461 doi "https://doi.org/10.1093/mnras/stx558" @default.
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