Project 10073 Record Card: Meteor Sighting, Bill, Wyoming, 22 December 1957

This document collection details the investigation of a sighting reported by a U.S. Weather Bureau Cooperative Observer in Bill, Wyoming, on 22 December 1957. The witness, while tending to livestock at the Antelope Creek Ranch, observed a greenish-white 'ball of fire' falling to earth at an estimated distance of one-quarter mile. The witness reported the event to the Weather Records Processing Center in San Francisco, which subsequently forwarded the account to the U.S. Air Force for evaluation under Project 10073. The Air Force investigation, led by Captain Gregory and finalized by Major Lawrence J. Tacker, concluded that the object was a fireball or bolide. This conclusion was supported by the witness's description of the object's color and behavior, which matched other reports of bolides in the region during the previous year. The documentation includes the original Project 10073 record card, internal Air Force routing slips, and correspondence from Major Tacker to the witness confirming the official assessment. The records indicate that the sighting was considered a natural phenomenon, specifically a meteor, and no further investigation was deemed necessary.