Sylvio Ferraz Mello, Brazilian astrophysicist (São Paulo 26 October 1936 – Known worldwide as a specialist on the dynamics of bodies in the solar system, perturbation theory in celestial mechanics and in dynamical systems in general Studied the
role of resonances in orbital dynamics of solar systems and dissipative
processes in solar system evolution
ACHIEVEMENTS
Introduced a special shadow function or approximation (1964) Developed a perturbation model valid for very high eccentricities Discovered chaotic eccentricity jumps to values larger than 0.9 in 3.1 resonance with Jupiter Creep Tides. A new model to study the tidal evolution of closein satellites and exoplanets. Rev. Mex. Astron. Astrol. (2014) A rheophysical tidal theory for exoplanets and satellites (2012) First to study exoplanet systems whose orbits are resonant between them With T. Michtchenko & C. Beaugé. The orbits of the extrasolar planets HD82943c and b. Astrop. J. 621:47381, 2005 Proposed a model that explained the absence of great asteroids with sixyears period and the their excess with eightyears period (1993) With D. Lazzaro & R.V. Martins. A semianalytical solution for the eccentricities and longitudes of the pericenter of the Uranian satellites. Astron. Astrop. (1987) With M. Sato & P.E. Nacozy. A numerical averaging procedure for the Galilean satellites system (1983) Ferraz Mello technique or algorithm of datecompensated discrete Fourier transform Estimation of periods from unequally spaced observations. Astron. J. 86:619, 1981 First to study the pair EuropaGanymedes in Dynamics of the Galilean Satellites (1979) Proposed an extension to several degrees of freedom of the Delaunay method (1978) HONORS Doctor Honoris Causa, Observatoire de Paris (2007) Brouwer Award, American Astronomical Society (Division on Dynamical Astronomy) 2015 Asteroid Ferraz Mello (5201)

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