Project 10073 Record Card: Sighting Report - San Antonio, Texas, 28 March 1957

This document details a UFO sighting report filed under Project 10073, concerning an event that occurred on March 28, 1957, in San Antonio, Texas. The witnesses, a civilian couple, observed a single object described as a large, baseball-sized star that appeared white and very bright before turning pink as the sun set. The witnesses reported that the object remained stationary for a period of 10 to 15 minutes, during which a shaft appeared from the top of the object, before it moved upward and disappeared. The report includes technical data regarding the observation, noting that no optical aids were used and that the weather conditions were clear with 15 miles of visibility. The investigation into the incident involved coordination between the 741st ACWRON at Lackland AFB and the US Weather Bureau. The Weather Bureau provided information confirming that a 'Skyhook' type balloon had been released from San Angelo, Texas, and was preplotted to be over the San Antonio area at 0100Z, approximately 16 minutes before the sighting. Based on this data, the official conclusion reached by the evaluating authorities was that the sighting was likely caused by the reflection of the setting sun on the Skyhook balloon, which would account for the object's appearance, color change, and eventual disappearance as the sun set. The report was forwarded to the headquarters of the 33rd Air Division.