France: Planetoid orbiting Venus — 7 May 1761
Prominent French astronomer J. L. Lagrange observed an object that seemed to be in orbit
around Venus. He announced that its orbital plane was perpendicular to the ecliptic. Venus was then an evening “star” at 207° heliocentric longitude and 34° elongation.
Source: “The Problematical Satellite of Venus,” The Observatory 7 (1884): 222-226. Case: W297