Document Collection

1958

571 documents 1952–1988

Project 10073 Record Card and Correspondence — Sighting of 20 May 1958, Mount Prospect, Illinois

📅 20 May 1958📍 2 Mi E of Mount Prospect, IllinoisAir Technical Intelligence Center (ATIC)

A 1958 sighting of a 'bullet-shaped' object in Illinois was officially dismissed by the Air Force as an optical illusion caused by sun refraction. Later correspondence from a planetarium director provided a more detailed, saucer-like description, which was similarly dismissed by astronomer Donald Menzel.