On 28 March 1950, Master Sergeant Prince Patterson reported a white object crossing part of the sky above Santiago in five to ten seconds. He had been watching from the roof of the United States Embassy with borrowed field glasses. An attached air-intelligence report also discussed Venus, but its stationary-light observation was made the following day. The surviving file does not establish that the two observations had the same cause.
Three documents, repeated in the file
The released six-page packet contains a summary card, an air attaché report and Patterson’s statement with a diagram. Each appears twice. Those duplicates preserve the same material; they are not six separate witness accounts. The card records an unidentified classification and marks both photographs and physical evidence absent.
The report is IR-42-50, dated 30 March 1950 and prepared by Major Harry L. Mitchell, Assistant Air Attaché. It was approved by Lieutenant Colonel Jay P. Thomas. It combines newspaper reports with observations by attaché-office personnel. An official reporting channel establishes the document’s provenance, rather than independently validating every interpretation in it.
Why Patterson went to the roof
Patterson says that around 14:30 on 28 March he was returning to the embassy for the afternoon’s work. He noticed people looking into the sky but did not stop to question them. At the building, he first looked from a ninth-floor window and saw nothing. He then borrowed field glasses from the Navy Attaché and went to the roof.
He described his initial expectation as finding an illusion, perhaps a cloud wisp or reflection, which would convince him there was nothing unusual in the sky. He said he scanned with his unaided eyes and the glasses for approximately an hour. This tells us the search was deliberate, but the account does not supply a continuous instrument record or a stopwatch log.
The brief moving-object observation
At approximately 15:15, according to his statement, Patterson noticed an object moving from south to north. He first detected it without the glasses and then watched through them. He considered its altitude and speed extreme, yet said that its appearance was too distant for detail. Its colour was predominantly white, and its path appeared straight.
He estimated that it crossed about thirty degrees of sky in five to ten seconds. This is an angular estimate: how much of his field of view it traversed. Without a separately established distance, the figure does not give a physical speed in miles per hour. Describing an object as very high is also not a measured altitude.
The statement does not give an unambiguous disc, sphere or other resolved shape for this object. The report’s general subject heading, Flying Discs, should not supply a shape that Patterson could not distinguish. There is no radar observation in his statement; the optical assistance was a pair of field glasses.
The camera and the sketch
After the brief view, Patterson decided to obtain a camera with a telephoto lens so that he could try to record the object. When he returned to the roof, he could not find it again. The account describes an unsuccessful attempt to obtain evidence. It does not describe a missing photograph or a photograph withheld from this packet.
His accompanying sketch places the apparent track in relation to the Sun, his observing position and a rooftop smokestack and shadow. It is a witness diagram, not a triangulated route through measured points. Handwritten speed calculations on the sheet depend on assumed distances. They do not independently establish those distances.
The time spent going inside is not supplied. Consequently, the object’s absence on his return does not determine when it ceased to be visible or show an instantaneous disappearance. The evidence is the reported short observation followed by failure to reacquire it.
The clock times do not fully agree
The statement places Patterson’s sighting at about 15:15. Mitchell’s report describes the downtown public observation on 28 March between 13:30 and 14:10. The summary card supplies 19:30Z. These are different time entries attached to related material, and the packet does not explain how they were reconciled.
It would be unsafe to treat every person looking up downtown as a witness to Patterson’s later moving object. He explicitly says that he did not stop to speak to the people he passed. No independently timed second statement in the packet connects a particular member of that crowd with the five-to-ten-second track.
What was identified as Venus
The report’s comment says that on 29 March a silver-coloured stationary object was seen in the same relative position as the light watched by the public the preceding day. After observation, it was considered to be Venus. The report also attributes a Venus explanation to Professor Frederico Rutland of the University of Chile’s astronomical observatory.
That explanation has a defined scope. A stationary daylight point and a reported rapid angular crossing are different descriptions. The file does not present a calculation identifying Patterson’s particular moving target as Venus, nor an experiment reproducing his brief impression. Conversely, an unusual motion report does not invalidate the ordinary planetary identification of a separate light.
The report also mentions earlier observations in Punta Arenas and the Santiago, San Bernardo and Valparaíso areas. These are background to the reporting episode. The ball-like description attributed to the Punta Arenas accounts should not migrate into Patterson’s statement, and a short official summary is not a substitute for reading all of those original newspaper reports.
What the record supports
The useful evidence is a named observer’s near-contemporary statement, an attached diagram and an official report prepared two days after the central observation. Its limits are equally concrete: no successful photograph, no physical trace, no measured range, no second independently timed view of the same track, and inconsistent time entries in the summaries.
The outcome is Insufficient evidence. The historical card retained unidentified, but that administrative label does not establish extraordinary performance or an extraterrestrial object. Venus was proposed for the stationary light, while the cause of Patterson’s short moving-object impression is not demonstrated in the released packet. A complete identification would require evidence the file does not supply.
The year and the city reference
The incident-year filter records 1950. The report date, the later form version printed on the summary card and the archive upload date are different kinds of dates. None replaces 28 March as the date of Patterson’s reported observation. No UFO feature tag is assigned because the central account does not resolve an object shape or document another supported feature.
The map uses an approximate Santiago city reference, rounded from GeoNames 3871336. It does not mark the exact 1950 embassy rooftop, the object’s position, a private residence or the present embassy. No current public access is asserted. For a contrasting case in which timed directions were explicitly compared with Venus, see the 1957 Cajamarca instrument record.