PROJECT 10073 RECORD CARD — Sighting Report, Sioux Falls, South Dakota, 11 August 1960

This document consists of a Project 10073 record card and associated correspondence regarding an unidentified aerial phenomenon reported on August 11, 1960, near Sioux Falls, South Dakota. The witness described a white, circular object with no sound or tail, possessing a brilliance three times that of Jupiter. The object was observed moving south just above the horizon, disappearing for five to ten seconds before reappearing with a weakening intensity. The total duration of the sighting was approximately three minutes. The observer noted that the object's speed appeared to be faster than that of a manned aircraft and speculated that it might be a satellite or a missile. Following the report, an evaluation request was initiated by Colonel Richard R. Shoop of the USAF to determine if an artificial satellite was responsible for the sighting. The final assessment concluded that because the request for satellite data went unanswered and there was no tracking information available, the object could not be definitively classified as a satellite. Consequently, the case was officially categorized as having insufficient data for a conclusive evaluation.