Project 10073 Record Card — 21 August 1958 Sighting, Rock Springs, Wyoming

This document is a Project 10073 record card and accompanying teletype report regarding an unidentified aerial phenomenon observed on 21 August 1958. At approximately 2130 local time, a civilian architect reported seeing a round, green object with a neon glow, described as being the size of a pencil head. The object was observed for 3 to 5 seconds as it moved in a downward trajectory before disappearing behind a hill. The sighting occurred on Highway 187, roughly 26 to 30 miles north of Rock Springs, Wyoming. The weather was reported as clear with the moon visible. The reporting agency, the Air Technical Intelligence Center (ATIC), received the report via the Air Defense Command (ADC). Military personnel, specifically S/Sgt Lyons and 1/Lt Niven of the ADC Intelligence office at Ent Air Force Base, Colorado, were involved in the processing of the report. The document notes that the observer had a history of reading and discussing UFOs extensively, and the evaluating officers suggested that the observer's background might have influenced his account. The informant also claimed to have witnessed similar objects on two prior occasions: once in Africa in 1952 and once near Colorado Springs in 1956. Official conclusions reached by the evaluating authorities suggest that the description provided is characteristic of a meteor. The report explicitly states that the ADC was unable to verify the sighting via radar and recommended a check with the 29th Air Division for further information.