Project 10073 Record Card — Montevideo, Uruguay, October 15, 1958

This document contains records from the Centro de Investigaciones de Objetos Voladores Inidentificados (C.I.O.V.I.) regarding a sighting in Montevideo, Uruguay, on the morning of October 15, 1958. Multiple witnesses, including students and journalists from the newspaper 'Accion', reported observing a bright, luminous object moving at high speed over the city, specifically near Plaza Independencia and Plaza Matriz. Descriptions of the object varied slightly, with some witnesses describing a bright ball of fire with an opaque, whitish smoke trail that performed circular maneuvers before ascending vertically. The sighting lasted approximately ten minutes. The event generated significant public interest and speculation, with theories ranging from meteors and satellites to the 'Pioneer' rocket. However, the official evaluation provided by the Meteorological Service of Uruguay concluded that the phenomenon was likely a high-altitude jet aircraft. The report notes that the object's appearance was consistent with the condensation of turbine exhaust at altitudes between 12,000 and 15,000 meters. This conclusion was supported by information that the Uruguayan Air Force was conducting routine flight operations over Montevideo at the time of the sighting. The documentation includes standardized observation forms filled out by witnesses, which detail the object's behavior, appearance, and the lack of associated sound or electromagnetic effects. The case serves as an example of the intersection between public reports of unidentified aerial phenomena and official military or meteorological explanations during the late 1950s.