DOW-UAP-D157: Sias’s Sassari sphere account
A 1953 U.S. air attaché report transmits Giovanni Battista Sias’s account of a brilliant, briefly visible sphere over Sassari, Sardinia, in August 1952. The translated statement includes his astronomical calculations, reported consultations and religious interpretation. These remain the witness’s explanations; the covering officer expresses reservations and the file contains a one-day discrepancy in the sighting date.
- File
- Document · Release 07
- Date
- Aug 27, 1952
- Location
- Italy
- Extent
- 5 pages
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Probed Assessment
The file preserves a witness narrative and competing interpretations, with no established physical explanation or independently measured size.
Key takeaways
- The account describes a three-to-five-second luminous event.
- Its geometry depends on assumed distances and illumination.
- Religious interpretation and additional witness reports are attributed to Sias.
- The cover and translated narrative differ by one day on the sighting date.
Why it matters
The report shows how a witness’s observations, calculations and beliefs entered an official intelligence file without becoming a confirmed explanation.
Corroboration
Two other observers are named within Sias’s statement; their separate accounts are not supplied here.
Open questions
- • Which sighting date is correct?
- • Are the original drawing, newspaper article and astronomer correspondence available?
Probed separates this editorial assessment from the source claims below. It summarizes what the released artifact supports; it is not independent verification.
Official Description from War.gov
This document is an Air Intelligence Information Report (AIIR), a standardized U.S. Air Force reporting form used to record raw information of potential intelligence value for later analysis. The form served as a primary vehicle for U.S. Air Force field intelligence collection throughout the early Cold War, until defense-wide reporting standards were established in the early 1960s. This AIIR records an August 27, 1952, incident near Sassari, Italy, that was reported in the local Italian press the following day. The U.S. Air Attaché in Rome relayed the translated newspaper account to the Air Force in November 1953 and later interviewed the individual who made the initial report, Professor Giovanni Battista Sias. Sias described observing a brilliantly luminous sphere, slightly larger in apparent size than the full moon, with a green-blue color, silvery brightness, and metallic streaking on its right side. He reported that it moved from east to west at very high speed, intermittently disappearing and reappearing while leaving behind a narrow luminous trail or ribbon. The preparing officer characterized Professor Sias as intelligent, pleasant, and eager to share his account. All descriptive and estimative language contained in this report reflects the reporter’s subjective interpretation at the time of the event. Such characterizations should not be interpreted as a conclusive indication of the presence or absence of any intrinsic object features or performance characteristics.
Preserved verbatim as source metadata. This wording is separate from Probed’s file-specific description and assessment.
File Context
Related entities
Tracker findings
Report contains conflicting August observation dates
The cover dates the sighting August 28, while Sias’s quoted newspaper article says it occurred on August 27 at 2145 hours; the file does not resolve that discrepancy.
Witnesses described a brief green-blue sphere and trail
Sias described a bright green-blue sphere, apparently slightly larger than the full moon, alternating with a luminous ribbon during three to five seconds of visibility.
Size estimates depended on distance assumptions
The large distances and diameters in the translated account are calculations dependent on assumptions about sunlight and Earth’s shadow, not measured object dimensions.
Iron-and-nickel meteor explanation was proposed
Sias reports a further suggestion from Junkes that the colors and luminosity could reflect iron and nickel in an astronomical body.
The priest found the available explanations unsatisfactory
Sias acknowledges that none of the proposed hypotheses was entirely satisfactory.
Release provenance
- Release
- Release 07
- Official ID
- release-07-file-010-dow-uap-d157-air-intelligence-information-report-italy-1952
- Cleared
- Oct 23, 2026
Referenced Timeline
Sias dates his Sassari observation
The translated newspaper account gives August 27 at 2145; the cover instead says August 28.
Sias dates his written account
The translated account ends with this date in Sassari.
LinkedGiovanni Battista SiasWoida forwards the account
The air attaché report transmits the statement and records the preparing officer’s reservations.
Source Claims
Claims are attributed to the released source and remain distinct from Probed’s assessment and tracker findings.
Joseph A. Woida’s December 15, 1953 report forwards Sias’s account of an unusual aerial phenomenon in Sassari.
This IR transmits a report of unusual aerial phenomenon witnessed by Prof. G. B. SIAS
The cover dates the sighting August 28, while Sias’s quoted newspaper article says it occurred on August 27 at 2145 hours; the file does not resolve that discrepancy.
Yesterday evening, 27th of August, at 2145 hours
Sias described a bright green-blue sphere, apparently slightly larger than the full moon, alternating with a luminous ribbon during three to five seconds of visibility.
The apparition lasted in total three to five seconds.
Sias’s account names Brau and Mr. Piccolo as additional observers; the file presents that corroboration through Sias’s narrative.
testimony of two other persons: an orphan, Brau
Sias says he consulted Father Junkes of the Vatican Observatory about the observation and its geometry.
I went to Father Junkes, well-known astronomer, director of the Vatican observatory at Castel Gandolfo
The large distances and diameters in the translated account are calculations dependent on assumptions about sunlight and Earth’s shadow, not measured object dimensions.
At such a distance an apparent diameter of 1/2 degree
Sias reports a further suggestion from Junkes that the colors and luminosity could reflect iron and nickel in an astronomical body.
the birght green, blue, silver colors and the luminosity of the sphere is presumably due to the remarkable
Sias acknowledges that none of the proposed hypotheses was entirely satisfactory.
none was entirely satis- factory.
Sias’s statement assigns religious significance to the sighting but explicitly declines to affirm that the sphere contained non-human beings.
I dare not affirm - amd it would be presumption on my part ~- that the sphere was occupied by non-human beings
Sias proposes transferring his writing to the American Embassy and connects his request for a reward to the Institute for War Orphans.
for the benefit of the Institute for War Orphans and E.N.A.L.L.I.
The covering officer records Sias’s strong convictions and expresses reservations; the report does not adopt Sias’s explanation as an official finding.
He, in his own mind, is convinced that either:
Source Material & Evidence
Research Map
Lines appear only when two entities share a row-level source claim or dated timeline event. Unconnected nodes remain visible without implying a relationship.