An approximate integral and solution for eccentric planetary type orbits in the restricted problem of three bodies

Details An approximate integral and solution for eccentric planetary type orbits in the restricted problem of three bodies An approximate integral and solution for eccentric planetary type orbits in the restricted problem of three bodies

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990cemda..50..209h&link_type=abstract

Celestial Mechanics and Dynamical Astronomy, Volume 50, Issue 3, pp.209-230

Astronomy and Astrophysics

Astronomy

Circular Restricted Problem, Quasi-Integral Of Motion, Angular Momentum, Perturbation Theory

Scientific paper

The circular restricted problem of three bodies is investigated analytically with respect to the problem of deriving a second integral of motion besides the well known Jacobian Integral. The second integral is searched for as a correction the angular momentum integral valid in the two body case. A partial differential equation equivalent to the problem is derived and solved approximately by an asymptotic Fourier method assuming either sufficiently small values for the dimensionless mass parameter or sufficiently large distances from the barycentre. The solution of the partial equation then leads to a function of the coordinates, velocities and time being nearly constant, which means that its variation with time is about 40 300 times less than that of the pure angular momentum. By averaging over the remaining fluctuating part of the quasi-integral we are able to integrate the first order equations using a renormalization transformation. This leads to an explicit expression for the approximate solution of the circular problem which describes the motion of the third body orbiting both primaries with nonvanishing initial eccentricity (eccentric planetary type orbits). One of the main results is an explicit formula for the frequency of the perihelion motion of the third body which depends on the mass parameter, the initial distance of the third body from the barycentre and the initial eccentricity. Finally we study orbits of the P-Type, being defined as solutions of the restricted problem with circular initial conditions (vanishing initial eccentricity).

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