Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011a%26a...532l...4l&link_type=abstract
Astronomy & Astrophysics, Volume 532, id.L4
Astronomy and Astrophysics
Astrophysics
4
Chaos, Methods: Numerical, Celestial Mechanics, Planets And Satellites: Dynamical Evolution And Stability, Minor Planets, Asteroids: Individual: Ceres, Minor Planets, Asteroids: Individual: Vesta
Scientific paper
We consider the full Solar System including(1) Ceres and some of the main asteroids, (2) Pallas, (4) Vesta, (7) Iris, and (324) Bamberga. We show that close encounters amongthese small bodies induce strong chaotic behavior in their orbits and in those of many asteroids that are much more chaotic than previously thought. Even if space missions will allow very precise measurements of the positions of Ceres and Vesta, their motion will be unpredictable over 400 kyr. As a result, it will never be possible to recover the precise evolution of the Earth's eccentricity beyond 60 Myr. Ceres and Vesta thus appear to be the main limiting factors for any precise reconstruction of the Earth orbit, which is fundamental for the astronomical calibration of geological timescales. Moreover, collisions of Ceres and Vesta are possible, with a collision probability of 0.2% per Gyr.
Delisle J.-B.
Farrés Ariadna
Fienga Agnès
Gastineau Michael
Laskar Jacques
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