The Ubatuba Sphere Incident
The Ubatuba Incident centers on physical evidence from an UFO event reported in Brazil in 1957. On September 14, 1957, the Rio de Janeiro newspaper O Globo published a column by journalist Ibrahim Sued titled “Um Fragmento de Disco-Voador!” Sued had received an anonymous letter accompanied by three small pieces of white or light metallic fragments.
The writer described how, some days earlier while fishing with friends near Ubatuba in São Paulo state at midday, they witnessed a flying disc approaching the beach at high speed. It appeared about to plunge into the sea but made a sharp upward turn, climbed rapidly, and then exploded in flames. It disintegrated into thousands of fiery fragments that rained down sparkling with magnificent brightness, visible even in daylight. Some pieces fell close to the beach and were collected. The material felt very lightweight. The original letter referred only to the location as near Ubatuba; later accounts often place the episode at or near Praia das Toninhas.
The core evidence consists of the three small metallic fragments sent with the anonymous letter rather than any intact sphere. The sample chain began with the anonymous sender to Ibrahim Sued and O Globo, then to Dr. Olavo Fontes, who delivered fragments to the Brazilian Mineral Production Laboratory. There, analyst Luisa Maria A. Barbosa used a Hilger mass spectrograph and reported magnesium of high purity with no other metallic elements detected at the equipment’s sensitivity, cited by Fontes as around one part per million.
Elson Teixeira performed a separate spectrographic analysis that confirmed the findings. Samples later moved into APRO custody with Jim and Coral Lorenzen, who in 1987 turned material over to astrophysicist Peter Sturrock at Stanford. Sturrock and others conducted further surface, internal, and isotopic studies. Later pieces entered testing by researchers including Robert Powell, Michael Swords, Mark Rodeghier, and others.
Early Brazilian tests reported magnesium with no other metallic elements detected within the limits of the equipment. The Colorado Project, part of the Condon Committee, examined Ubatuba magnesium as one of its notable physical evidence items and identified trace elements including strontium, barium, copper, zinc, aluminum, manganese, mercury, and chromium. The project found that magnesium isotope content did not differ significantly from other samples, with strontium noted as unusual in magnesium and appearing uniformly distributed. Walker and Johnson, along with Michael Swords in the 1992 Journal of UFO Studies, contributed additional studies focusing on grain and lattice structure, including large elongated grains.
In 2001 Sturrock published composition analysis results. A 2022 paper by Powell, Swords, Rodeghier, and Budinger reviewed the history of chemical testing and presented new 2017–2018 HR-ICPMS results on magnesium and trace elements strontium, barium, copper, and zinc. Magnesium isotope ratios fell within terrestrial limits, while trace-element isotope results remained inconclusive; the authors recommended improved procedures for future trace analysis.
Separate contested sample claims involve Vallée and Nolan’s discussion of two Argentina-held pieces labeled Muestra A and Muestra B, one tied to Fontes and another to an Argentinian sailor. One reportedly showed natural magnesium isotope ratios while the other appeared non-natural, though contamination concerns with silicon and sodium were noted. These pieces do not share the same custody chain as the main APRO–Sturrock–Powell material.
The Ubatuba case stands out for the unusually long scientific afterlife of its fragments, which passed through Brazilian government-linked labs in 1957, APRO custody, the Colorado Project, French and Stanford-linked work, Sturrock’s analyses, and the 2022 HR-ICPMS follow-up. This extended laboratory examination of the material, rather than the initial sighting account alone, gives the incident its lasting significance in the study of physical evidence associated with reported UFO events.
