1898年8月16日：土卫九现身

1899年3月，威廉·皮克林通过分析照相底片发现了土星的卫星土卫九。这是人类首次通过摄影手段而非直接观测发现的卫星，后来它也成为了卡西尼号土星探测器的首个探测目标。

In March of 1899, William Pickering discovered Phoebe, a moon of Saturn, on photographic plates taken on Aug. 16, 1898, by DeLisle Stewart. It was the first moon to be discovered photographically, rather than observationally, and over a hundred years later, it would be the first target of the Cassini spacecraft. Phoebe orbits at a Continue reading "Aug. 16, 1898: Phoebe makes an appearance" The post Aug. 16, 1898: Phoebe makes an appearance appeared first on Astronomy Magazine .