CORROBORATED
CF-GEI-20080502226 CORROBORATED

The Saint-Coulomb ISS Misidentification

CASE FILE — CF-GEI-20080502226 — CASEFILES CLASSIFIED ARCHIVE
Date Date when the incident was reported or occurred
2008-05-29
Location Reported location of the sighting or event
Saint-Coulomb, Ille-et-Vilaine, Brittany, France
Duration Estimated duration of the observed phenomenon
Several minutes
Object Type Classification of the observed object based on witness descriptions
orb
Source Origin database or archive this case was sourced from
geipan
Witnesses Number of known witnesses who reported the event
1
Country Country where the incident took place
FR
AI Confidence AI-generated credibility score based on source reliability, detail consistency, and corroboration
85%
On the evening of May 29, 2008, a single witness in Saint-Coulomb, Brittany, reported observing successive luminous phenomena in the night sky. The primary observation involved a silent, moving yellow-white luminous sphere that traveled across the sky. The witness also reported seeing stars that appeared to change color. The testimony was submitted to GEIPAN on May 30, 2008, with the witness describing the events as occurring "last night," confirming the observation date as the night of May 29-30, 2008. GEIPAN investigators analyzed the report against astronomical data and weather conditions for that specific date and time. The color-changing stars were quickly identified as a common atmospheric phenomenon: stellar scintillation caused by high-altitude winds and atmospheric turbulence, which varies in intensity depending on meteorological conditions. The main observation—the bright, moving luminous sphere—correlated precisely with a documented overhead pass of the International Space Station (ISS) over Brittany at the time indicated by the witness. Despite the strong correlation with ISS tracking data from Calsky (referenced in the official investigation file), GEIPAN noted that the lack of precise details in the witness testimony prevented absolute confirmation. The case was classified as "B" (probable identification), indicating a likely but not definitively confirmed explanation. This represents a textbook example of how unfamiliarity with common astronomical objects and atmospheric phenomena can lead to UAP reports.
02 Timeline of Events
2008-05-29 evening
Observation of color-changing stars
Witness observes stars that appear to change color in the night sky—later identified as normal stellar scintillation caused by atmospheric turbulence and high-altitude winds
2008-05-29 late evening
ISS overhead pass begins
Witness observes a bright yellow-white luminous sphere moving silently across the sky. The object's timing and trajectory match a documented ISS pass over Brittany
2008-05-29 late evening
Object departs from view
The luminous sphere continues its steady trajectory until it passes out of the witness's field of view
2008-05-30 daytime
Testimony submitted to GEIPAN
Witness submits detailed testimony to GEIPAN describing the previous night's observations
Investigation period
GEIPAN analysis and ISS correlation
Investigators cross-reference witness testimony with Calsky orbital tracking data, confirming ISS pass at reported time and location. Stellar scintillation explanation provided for color-changing stars
Case closure
Classification B assigned
Case classified as 'B' (probable identification) due to strong ISS correlation despite imprecise witness details preventing absolute confirmation
03 Key Witnesses
Anonymous Witness 1
Civilian observer
medium
Single witness who reported the observation within 24 hours to GEIPAN. Unfamiliar with common astronomical phenomena such as ISS passes and stellar scintillation.
"hier soir [last night], observation du déplacement silencieux d'une boule lumineuse de couleur jaune-blanche"
04 Analyst Notes -- AI Processed
This case demonstrates excellent investigative methodology by GEIPAN. The investigators cross-referenced the witness's reported time and location with orbital tracking data for the ISS, finding a direct match. The ISS is one of the most commonly misidentified objects in the night sky, appearing as a bright, fast-moving light that can reach magnitude -4 or brighter, often described as yellow-white in color. Its silent passage and steady movement across the sky match the witness description perfectly. The witness credibility appears moderate—they accurately reported what they observed and submitted the report promptly (within 24 hours). However, the lack of specific details such as exact timing, direction of travel, angular size, or duration prevented investigators from achieving a Class A (certain identification) classification. The secondary observation of "color-changing stars" being attributed to scintillation is well-established science and indicates the witness may have been unfamiliar with basic astronomical phenomena, which slightly reduces the anomalous nature of their primary observation. The fact that GEIPAN specifically referenced orbital tracking data ("passage ISS Calsky") demonstrates due diligence in the investigation.
05 Theory Comparison
BELIEVER ANALYSIS
SKEPTIC ANALYSIS
Common astronomical misidentification
This represents a straightforward case of an observer unfamiliar with space-based objects misidentifying a well-documented, predictable phenomenon. The ISS is one of the most frequently reported 'UFOs' globally, particularly among first-time observers. The witness's lack of knowledge about stellar scintillation (a basic atmospheric effect) further suggests limited astronomical literacy, making the ISS explanation even more probable.
06 Verdict
ANALYST VERDICT
This case is almost certainly a misidentification of the International Space Station during a visible overhead pass. The ISS is frequently reported as a UFO by observers unfamiliar with its appearance—it moves steadily and silently, appears very bright (often brighter than any star), and displays a yellowish-white color due to its solar panels reflecting sunlight. The timing, location, and description all align with documented ISS orbital data. The classification as "B" rather than "A" reflects appropriate scientific caution given the witness's imprecise testimony, but the explanation is robust. This case has minimal significance for serious UAP research and serves primarily as an educational example of how even prosaic objects can generate sincere reports when witnesses lack astronomical knowledge.
AI CONFIDENCE SCORE:
85%
07 Community Discussion
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