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The coplanar orbit transfer problem has been an important topic in astrodynamicssince the beginning of the space era. Though many approximate solutions forpower-limited orbit transfer problem have been developed, most of them rely on simplificationsof the dynamics of the problem. This paper proposes a new approximationmethod called primer vector approximation method to solve the classic power-limitedorbit transfer problem. This method makes no simplification on the dynamics, butinstead approximates the optimal primer-vector function. With this method, this paperderives two approximate solutions for the power-limited orbit transfer problem.Numerical tests show the robustness and accuracy of the approximations

Solving Coplanar Power-Limited Orbit Transfer Problem by Primer Vector Approximation Method