<h2>AAS 99-107</h2>
<h2>Use of Lunar Gravity-Assists for Earth Orbit Plane Changes                                                                                       </h2>
<h4>M. Jah, J. Rustick, C. Potterveld, R. Madler                                                                                                                                        </h4>
Embry-Riddle Aeronautical University, Prescott, AZ                                                                                                                        
<h2> Abstract </h2>
For spacecraft whose mission design requires they undergo an orbital plane change maneuver. For a given family of final orbits, it may be more cost effective to use a Lunar Gravity-Assist (LGA) to achieve a large plane change. This paper examines these scenarios for Geostationary and retrograde final orbits, and provides the resulting Delta-V's for each case. Hohmann transfers with combined plane changes are used as a comparative baseline for evaluating the performance. Analysis covers the different transfer methods from each major world launch site.