Project 10073 Record Card — Denver, Colorado, 27 May 1958

This document consists of a Project 10073 record card and an associated teletype report regarding an unidentified aerial object sighting in Denver, Colorado, on the night of May 27, 1958. The witness, a die maker at the Sundstrand Corporation, reported observing a round object, described as the size of a pea at arm's length, which transitioned in color from orange to bluish-green. The object was noted to have a long orange tail and followed an oscillating, up-and-down flight path before appearing to burn out. The observation lasted approximately 10 to 12 seconds at an altitude of 45 degrees above the horizon. The report includes detailed meteorological data for the area, noting clear skies and distant lightning to the north. Official military evaluation by the Air Technical Intelligence Center (ATIC) concluded that the object was a meteor. While the report acknowledges that a balloon was released from Stapleton Field around the same time, the final determination remained that the sighting was meteoric in nature. The teletype communication between Lowry Air Force Base and the Air Defense Command highlights the confusion regarding the observer's directional reporting, which was attributed to the local street layout. An internal note on the document expresses skepticism regarding the reported oscillating flight path, labeling it 'impossible.'