The Contribution Of The Oblateness Of An Asteroid On The Orbital Evolution Of Its Satellites

Details The Contribution Of The Oblateness Of An Asteroid On The Orbital Evolution Of Its Satellites The Contribution Of The Oblateness Of An Asteroid On The Orbital Evolution Of Its Satellites

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.3928c&link_type=abstract

American Astronomical Society, DPS meeting #42, #39.28; Bulletin of the American Astronomical Society, Vol. 42, p.1037

Astronomy and Astrophysics

Astronomy

Scientific paper

About five years ago was discovered the first asteroid to have a pair of small satellites. That was 87 Sylvia with its satellites Romulus and Remus (Marchis et al. 2005). Nowadays a few more cases are known. A preliminary study of the long term dynamics of Romulus and Remus (Winter et al. 2009) showed that their trajectories would be highly unstable if Sylvia had a symmetrically spherical gravitational potential. However, Sylvia is highly oblate, J2=0.17. Consequently, the inclusion of J2 in the dynamics results in very stable trajectories for Romulus and Remus. That is mainly due to the fact that the orbital angular momenta of the satellites increase significantly due to J2. In the present work we show the results of a study of the evolution of the spin axis of the main asteroid and its effects on the orbital motion of the small satellites. In the dynamics of the spin is taken into account the perturbation of the Sun and Jupiter. The orbital planes of the satellites follow the equatorial plane of the asteroid.
Acknowledgements: This work has the support of FAPESP, CNPq and CAPES

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