Project 10073 Record Card — Clearfield, Utah, 23 May 1964

On 23 May 1964, two 12-year-old boys in Clearfield, Utah, reported observing an unidentified object while sleeping in their backyard. The witnesses were studying star constellations between 2030 and 2100 hours when they observed a triangular-shaped constellation. They reported that the lower right star of this formation detached itself and traveled across the sky in an arc, moving southeast and disappearing over the Wasatch Mountains. The object was described as having the color and size of an ordinary star and appeared to be at the same altitude as other stars. The report was initially received by the Security and Law Enforcement Division at Hill Air Force Base on 23 May 1964. Subsequent investigation by the Foreign Technology Division at Wright-Patterson Air Force Base concluded that the sighting was the result of the satellite ECHO I. Official records indicate that at 1057 MST on 23 May 1964, the ECHO I satellite passed north of Salt Lake City at a 70-degree elevation, moving in a southeasterly direction. The Air Force concluded that the description provided by the witnesses matched the trajectory and appearance of the satellite. Correspondence dated 20 July 1964 from the Public Information Division confirmed this evaluation to the witnesses.