Stationary red sphere over Massy

Summary

One evening in April 1986, a couple in Massy watched from their apartment a red sphere roughly the size of a streetlight, fixed in the sky for about 15 minutes. The object neither moved nor changed in appearance. There was no sound, no secondary effects, and no additional witnesses. Classified as C by GEIPAN, the case remains unresolved. The steady, constant light does not match common atmospheric phenomena, but the lack of further data prevented any identification.