Unidentified Flying Objects (UFO) Sighting Report — Boulder, Colorado, 13 December 1966

On December 13, 1966, between 0400Z and 0420Z, multiple reports of an unidentified object were received in the Boulder, Colorado area. A civilian observer reported watching a star-like object in the southeastern sky for approximately 20 minutes. The object was described as white, changing colors to red, green, purple, and blue. Another witness, Earl Tubs, described the object as cigar-shaped from a side view and pear-shaped from a head-on view. A student at the University of Denver also reported seeing the object. The reporting officer, TSgt Kuster, noted that Buckley Tower operators and other local contacts were unable to locate the object. The official conclusion reached by the evaluating agency was that the sighting was an astronomical observation of the star Sirius, which was rising on an azimuth of 115 degrees at the time. The report notes that Sirius, with a stellar magnitude of -1.5, is often mistaken for a UFO when low on the horizon.