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<TITLE>Abstract AAS 97-714</TITLE>
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<h2>AAS 97-714</h2>
<h2>OPTIMAL LOW-THRUST TRAJECTORIES TO EARTH-MOON L2 HALO ORBITS (CIRCULAR PROBLEM) </h2>
<h4> T.F. Starchville, Jr. and R.G. Melton - Pennsylvania State University </h4>
<h2> Abstract </h2>
Development of optimal low-thrust transfer trajectories required between Earth and an Earth-Moon L2 halo orbit is examined. A general optimal solution method is constructed using sequential nonlinear programming to find minimum-propellant spacecraft transfers. Only a single thrust phase of the trajectory (using tangential steering) is optimized with the spacecraft traveling the remaining time-of-flight on the stable manifold of the halo insertion point. The solution method is demonstrated for a number of insertion points on two different reference halos for the circular restricted three-body problem.