Spacecraft maneuvers is a very important topic in aerospace engineering activities today. In a more\r\ngeneric way, a spacecraft maneuver has the objective of transferring a spacecraft from one orbit to\r\nanother, taking into account some restrictions. In the present paper, the problem of rendezvous\r\nis considered. In this type of problem, it is necessary to transfer a spacecraft from one orbit to\r\nanother, but with the extra constraint of meeting another spacecraft when reaching the final orbit.\r\nIn particular, the present paper aims to analyze rendezvous maneuvers between two coplanar\r\ncircular orbits, seeking to perform this transfer with lowest possible fuel consumption, assuming\r\nthat this problem is time-free and using four burns during the process. The assumption of four\r\nburns is used to represent a constraint posed by a real mission. Then, a genetic algorithm is used\r\nto solve the problem. After that, a study is made for a maneuver that will make a spacecraft\r\nto encounter a planet, in order to make a close approach that will change its energy. Several\r\nsimulations are presented.
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