2018年5月21日,鹊桥中继卫星由长征四号丙火箭发射后,先进入地月转移轨道,中间飞行了大概4天。星箭分离以后,先是太阳电池板展开,然后就是抛物面天线顺利解锁展开,卫星建立了正常飞行姿态。从地球飞往月球的过程持续了大概4天。5月25日,鹊桥中继卫星在距离月面100公里的地方实施近月制动,四台20牛顿的轨控发动机点火912s后,正常关机,进入月球到L2点的转移轨道。前前后后,经过5次精准轨道控制,6月14日,鹊桥最终成功进入到了围绕L2点的晕轮轨道,成为世界首颗运行在地月L2点晕轮轨道上的航天器。鹊桥号在进入晕轮轨道之后,就开始了在轨测试工作。通信天线能不能精确指向啊?你总要测试一下吧,总要校准一下吧。这些零七八碎的工作到7月20号就全部完成了,下一步就是等着嫦娥4号的发射。毕竟它最主要的工作还是为嫦娥4号提供无线电中继服务。从鹊桥号的就位到嫦娥4号的发射中间还有半年时间呢。所以鹊桥号就只好先等着再说……
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