Tianwen-4

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A rough estimate of what the Tianwen 4 mission will look like based on the limited information available to the public. Launches in 2029, assist sequence EVEEJ, reaches Jupiter in 2035-12. Upon arrival, the probe splits in two, with the top segment going onto Uranus (2045-03) and the other segment staying in Jupiter's orbit. The Jupiter segment does a series of gravity assists around Ganymede and Callisto to circularize its orbit, and then finally a burn in 2038-03 to enter a polar orbit around Callisto.

Note: these trajectories were made by AI. It first used a Lambert solver to find the dates of each leg in the assist sequence then re-evaluated it using n-body integration. Then for the Jupiter segment, AI also used a patched conics implementation of Jupiter's system (the four moons) to model the flybys. The process took about one hour.

天问四号任务的粗略估计，使用有限的公开信息才能重建任务的路线。2029年9月发射，使用EVEEJ引力弹弓锁链，2025年12月达到木星。探测器达到木星时候就分成两个部分，上面继续到天王星（2045年3月达到），下面的留在木星轨道。上面部分使用来自木卫三和木卫四的多次引力协助，才能减少离心率，最后在2038年3月点燃发动机进入木卫四极地轨道。

注意:这些路线被AI创造的。首先使用了兰伯特算法才能找到每个引力协助的具体日期，然后使用多体积分重新算一边。在木星轨道，AI也使用布片圆锥区才模拟木星四颗最大卫星。整个过程耗费了一个小时。

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