Project 10073 Record Card — Green River Lakes, Wyoming, 9 October 1958

This document details the investigation of an Unidentified Flying Object (UFO) sighting reported by three doctors on October 9, 1958, near the Green River Lakes in the Bridger National Forest, Wyoming. The witnesses, who were moose hunting, observed a bright, bluish-green object for approximately 15 to 17 minutes while stationary in a stuck pickup truck. They described the object as having erratic, jerky, and tumbling-like motion, remaining in the same general vicinity before eventually fading from view. The witnesses used 8x35 binoculars to observe the object, noting that it appeared significantly larger than typical celestial bodies and exhibited varying intensity. They explicitly compared the object's motion to that of Sputnik, though they noted differences in color and flight pattern. Following their initial report, the Air Technical Intelligence Center (ATIC) initiated a formal investigation, requesting further details regarding the observers' precise location, the behavior of the stars, and local weather conditions. The investigation was conducted by the Office of Special Investigations (OSI) at Francis E. Warren Air Force Base. ATIC also consulted the National Weather Records Center to determine if atmospheric conditions, specifically temperature inversions, could explain the sighting. The records confirmed a shallow temperature inversion in the area on the date of the incident. Based on the evidence, including the object's position, the atmospheric data, and the witnesses' descriptions, the official conclusion reached by the Air Force was that the object was the star Fomalhaut. The perceived erratic motion and varying brightness were attributed to atmospheric refraction caused by the mountainous terrain and the temperature inversion. The report includes the original record card, correspondence between the witnesses and the Air Force, the technical information sheet completed by the witnesses, and the subsequent internal military communications regarding the investigation.