Paris Observatory, France — 25 January 1672
Unknown planetoid orbiting Venus
The great astronomer and planetary observer Giovanni Domenico Cassini, who was director of Paris Observatory at the time, recorded the presence of an object that seemed to be a satellite of Venus. He would not announce this discovery until he saw the object again, in 1686. This supposed satellite was later named “Neith.”
Source: “The Problematical Satellite of Venus,” in The Observatory 1 (1884): 222-226. Case: W241