Unidentified Flying Object Sighted — Philadelphia, Pa., 8 June 1958

This document is a Project 10073 record card and accompanying correspondence from the 3rd District Office of Special Investigations regarding a UFO sighting in Philadelphia, Pennsylvania, on 8 June 1958. The witness, a technical illustrator employed by the Philco Corporation, reported observing a flat, black, triangular object with rounded corners, described as being the size of a shirt button held at arm's length. The object was observed for approximately 15 minutes. According to the initial report, the object climbed steadily for about five minutes, hovered, then descended and traveled west before disappearing. The observer noted that he happened to look toward the horizon and saw the object instantly. The report includes detailed weather data provided by a meteorological aide, indicating clear conditions with 12-mile visibility. The official conclusion reached by the Air Force is that the description and flight characteristics of the object conform to the observation of a balloon release. The document contains handwritten annotations by military personnel highlighting inconsistencies in the observer's account, specifically regarding the object's flight path and direction. The file was forwarded to the Air Technical Intelligence Center at Wright-Patterson Air Force Base for their information and any further action deemed appropriate, though the District Office stated no additional investigation was contemplated.