He recorded his discovery as follows: "The great light of my forty-foot telescope was so useful that on the 17th of September, 1789, I remarked the seventh satellite, then situated at its greatest western elongation."
他如此记录这次发现：“1789年9月17日，我的四十英尺望远镜状态出色，我发现了第七颗卫星，当时它位于轨道最西侧。