This paper presents the study of direct rendezvous mission to outer gas giant planets Jupiter, Saturn, Uranus and Neptune. The detailed mission design is presented including spacecraft design, launch schedule, delta-V requirement and high-fidelity low thrust trajectory analysis using fusion propulsion system. A fly-by mission to Pluto has also been explored to have a brief comparison with the New Horizons spacecraft Trip times are compared against the NASA's Juno, Cassini-Huygens and New Horizons missions showing that the fusion propulsion system can potentially enable trip times that are about one third of the current robotic missions. Spacecraft's initial parking orbit for assembly and integration is considered to be circular with 300 km in altitude and 28 degrees inclination. The trajectory of the fusion propulsion spacecraft for a rendezvous mission consists of three phases. The first phase is the acceleration phase and involves the spacecraft accelerating due to the thrust provided by the fusion propulsion system. The second phase is the coasting phase which does not requires the propulsion system. The third phase of the trajectory would involve in reducing the spacecraft velocity and performing orbital insertion around the celestial body.
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