Long-term effect of the masses (and their uncertainties) of large asteroids on the...
Constraints on the terminal ejection velocity fields of asteroid families
Orbital evolution of the asteroids in the first 700 MY of the solar system
| Grant number: | 11/19863-3 |
| Support Opportunities: | Regular Research Grants |
| Start date: | February 01, 2012 |
| End date: | July 31, 2014 |
| Field of knowledge: | Physical Sciences and Mathematics - Astronomy - Solar System Astronomy |
| Principal Investigator: | Valerio Carruba |
| Grantee: | Valerio Carruba |
| Host Institution: | Faculdade de Engenharia (FEG). Universidade Estadual Paulista (UNESP). Campus de Guaratinguetá. Guaratinguetá , SP, Brazil |
Abstract
Orbital diffusion caused by close encounters between a small asteroid and one of the most massive objects of the main belt, (1) Ceres, (2) Pallas, (4) Vesta, (7) Iris, and (324) Bamberga, was already known to be a mechanism able to change proper elements of asteroids in the orbital proximity of (1) Ceres and (4) Vesta (Carruba et al. 2003, 2007). Changes in semi-major axis, eccentricity and inclination caused by the long-term effect of close encounters with (4) Vesta can have contributed to the diffusion of some V-type objects outside the Vesta family, whose current orbits cannot be easily explained in terms of migration induced by other mechanisms, such as the Yarkovsky effect, interaction with mean-motion or secular resonances, or the interplay of both.The long-term effect of close encounters in previous works was not negligible, but of small entity, and only important in regions characterized by high collision probabilities with one of the most massive asteroids. Recently Laskar et al. (2011) showed that, when the five most massive asteroids are all included in simulations with all the other planets, surprisingly not only the orbits of the massive asteroids become more chaotic, but even the precision with which the orbital elements of the Earth are known with high accuracy is limited to 50 Myr. However, the effects on asteroid mobility of close encounters in the region of the five most massive asteroids have not yet be studied in detail when all five asteroids are considered.In this work we want to investigate if the mobility in proper elements of minor bodies is affected when the new integration scheme of Laskar (the entire Solar System plus the five most massive asteroids in the main belt) is considered. (AU)
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