CORROBORATED
CF-GEI-20120108168 CORROBORATED
The Les Clayes-sous-Bois Stationary Triangle
CASE FILE — CF-GEI-20120108168 — CASEFILES CLASSIFIED ARCHIVE
Date Date when the incident was reported or occurred
2012-01-02
Location Reported location of the sighting or event
Les Clayes-sous-Bois, Yvelines, France
Duration Estimated duration of the observed phenomenon
3 hours
Object Type Classification of the observed object based on witness descriptions
triangle
Source Origin database or archive this case was sourced from
geipan
Witnesses Number of known witnesses who reported the event
2
Country Country where the incident took place
FR
AI Confidence AI-generated credibility score based on source reliability, detail consistency, and corroboration
85%
On January 2, 2012, at approximately 16:30 (4:30 PM), a witness in Les Clayes-sous-Bois, Yvelines, observed a triangular object with red and yellow flashing lights that appeared stationary but occasionally seemed to rotate. The witness reported the sighting to the air navigation service in Chavenay, whose personnel also observed the phenomenon. The observation lasted three hours, yet no photographic evidence was obtained and no additional witnesses came forward.
The air navigation service correspondent confirmed seeing "a very bright luminous point" when contacted by GEIPAN investigators. Upon astronomical analysis, investigators noted that Venus was visible low on the horizon that evening, with Jupiter also visible near the Moon. Venus's low position would cause significant atmospheric scintillation, creating color variations matching the witness description. When recontacted, the witness acknowledged having identified Venus separately and stated the object was "close to the direction of Venus" but remained fixed for 2 hours, though could not provide precise direction or apparent height.
GEIPAN's investigation identified a third possibility: the observation direction corresponded to the Château de Plaisir (Les Saussaies), where a tethered illuminated balloon could have produced similar visual effects. However, investigators were unable to verify this hypothesis. The case was classified as "C" (insufficient information) due to imprecise observation direction, low strangeness (stationary object), absence of photographs despite the extended duration, and lack of corroborating witnesses.
02 Timeline of Events
16:30
Initial Observation
Witness begins observing triangular object with red and yellow flashing lights that appears stationary but occasionally seems to rotate on its axis
16:30-17:00
Alert to Air Navigation Service
Witness contacts air navigation service at Chavenay to report the phenomenon
17:00
Corroborating Observation
Air navigation service personnel observe and confirm seeing a very bright luminous point in the sky
16:30-19:30
Extended Observation Period
The object remains visible and stationary for approximately 3 hours. No photographs are taken despite the extended duration
Post-incident
GEIPAN Investigation
GEIPAN contacts air navigation service and witness, conducts astronomical analysis identifying Venus low on horizon with Jupiter near Moon
Post-incident
Witness Recontact
Witness confirms awareness of Venus and states object was near Venus's direction but cannot provide precise location data
Post-incident
Classification
GEIPAN classifies case as 'C' - insufficient information due to imprecise testimony, lack of photos, absence of additional witnesses, and low strangeness
03 Key Witnesses
Anonymous Witness 1
civilian
medium
Primary witness who observed the phenomenon and reported it to air navigation services. Demonstrated awareness of Venus but maintained the object was distinct. Unable to provide precise directional or elevation data.
"The luminous object was close to the direction of Venus, but fixed for 2 hours."
Air Navigation Service Personnel
air navigation officer
high
Professional observer at the air navigation service in Chavenay, trained in visual identification of aerial phenomena.
"I clearly saw a very bright luminous point."
04 Analyst Notes -- AI Processed
This case exhibits several characteristics typical of misidentified astronomical objects. The 3-hour observation duration beginning at 16:30 in January coincides with Venus's visibility as an evening star. Atmospheric scintillation of bright planets near the horizon is well-documented and commonly produces the "flashing colored lights" effect described. The witness's admission of separately identifying Venus, combined with the inability to provide precise directional data, significantly undermines the anomalous nature of the sighting.
The corroboration from air navigation personnel is noteworthy but limited—they described only "a very bright luminous point," not the triangular shape with rotating characteristics reported by the primary witness. This discrepancy suggests the initial witness may have been subject to perceptual interpretation of a point source. The complete absence of photographs during a 3-hour observation in 2012 (when mobile phone cameras were commonplace) raises questions about the visibility and distinctiveness of the phenomenon. GEIPAN's alternative hypothesis of a tethered balloon at Château de Plaisir remains unverified but plausible, representing a potential prosaic explanation that warrants the "C" classification rather than a definitive identification.
05 Theory Comparison
BELIEVER ANALYSIS
Structured Craft of Unknown Origin
The primary witness described specific characteristics: a triangular shape with red and yellow flashing lights that occasionally appeared to rotate while remaining stationary. The witness distinguished this object from Venus, which they separately identified. The corroboration from professional air navigation personnel adds credibility. A 3-hour stationary hover is unusual for conventional aircraft. However, this interpretation is weakened by the lack of detailed directional data, absence of photographs, and the single detailed description versus the simple 'bright point' reported by the second observer.
SKEPTIC ANALYSIS
Tethered Illuminated Balloon
GEIPAN identified that the observation direction corresponded to the Château de Plaisir (Les Saussaies). A tethered balloon equipped with lights could produce the visual impression of a stationary object with colored lights that appears to rotate. Such balloons are sometimes used for advertising or events. This hypothesis could not be verified due to lack of information about activities at that location.
06 Verdict
ANALYST VERDICT
This case most likely represents a misidentification of the planet Venus, possibly combined with psychological factors that led to the perception of a structured triangular craft. The astronomical conditions strongly support this conclusion: Venus was visible low on the horizon where atmospheric effects would produce scintillation and color changes. The witness's own acknowledgment of Venus's presence and the vague directional information significantly weaken the case for an anomalous object. The alternative tethered balloon hypothesis, while unverified, demonstrates multiple prosaic explanations exist. The lack of photographic evidence, additional witnesses, and the discrepancy between the detailed primary report and the simple "bright point" described by air navigation personnel all point toward a mundane explanation. This case holds minimal significance for UAP research and serves primarily as an example of how atmospheric and astronomical phenomena can be misperceived, even when observed for extended periods.
AI CONFIDENCE SCORE:
85%
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