CORROBORATED
CF-GEI-19780800534 CORROBORATED
The Hérouville Satellite Case
CASE FILE — CF-GEI-19780800534 — CASEFILES CLASSIFIED ARCHIVE
Date Date when the incident was reported or occurred
1978-08-06
Location Reported location of the sighting or event
Hérouville, Calvados, Basse-Normandie, France
Duration Estimated duration of the observed phenomenon
45 minutes
Object Type Classification of the observed object based on witness descriptions
light
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 the evening of August 6, 1978, two witnesses in Hérouville, located in the Calvados department of Basse-Normandie, France, observed a slow-moving luminous object traversing the night sky. According to their testimony, the object appeared as a very bright yellow light maintaining a steady, regular pace at high altitude. The observation lasted approximately 45 minutes as the light traveled along a southeast-to-northwest trajectory before disappearing from view.
The witnesses described the light's movement as slow and consistent, with no reported erratic behavior, color changes, or accompanying phenomena such as sound or secondary objects. The high-altitude nature of the sighting and the prolonged, straight-line trajectory were key characteristics noted in the official report. Despite the duration of the event, no other witnesses came forward to corroborate the sighting, limiting the investigation to a single testimony from two individuals.
GEIPAN, France's official UFO investigation agency operated by CNES (Centre National d'Études Spatiales), classified this case as "B" - indicating a likely explanation with good data quality. The official conclusion identifies the observed object as "probable observation of a satellite," based on the movement characteristics, duration, altitude, and trajectory pattern consistent with satellite passes visible to the naked eye during that era.
02 Timeline of Events
Evening, August 6, 1978
Initial Sighting
Two witnesses in Hérouville notice a very bright yellow light appearing in the southeastern sky at high altitude.
+10 minutes
Steady Movement Observed
Witnesses confirm the light is moving at a slow, regular pace along a southeast-to-northwest trajectory. The brightness and color remain constant.
+30 minutes
Continued Observation
The luminous object continues its steady progression across the sky with no deviation from its linear path or change in characteristics.
+45 minutes
Disappearance
The light disappears from the witnesses' view, likely crossing below the northwestern horizon or entering Earth's shadow.
Post-incident
Official Report Filed
Witnesses report their observation to authorities. Investigation reveals no additional witnesses despite the prolonged sighting duration.
Investigation conclusion
GEIPAN Classification
GEIPAN assigns Classification B (likely explained) with official conclusion of probable satellite observation based on movement characteristics and trajectory analysis.
03 Key Witnesses
Anonymous Witness 1
Civilian
medium
One of two witnesses who observed and reported the phenomenon to French authorities. No additional background information available in official records.
"Une lumière très brillante de couleur jaune s'est déplacée lentement et à une allure régulière durant trois quart d'heure en haute altitude selon une direction Sud-Est Nord-Ouest."
Anonymous Witness 2
Civilian
medium
Second witness who corroborated the observation alongside the primary witness. No individual testimony details preserved in the case file.
04 Analyst Notes -- AI Processed
This case represents a textbook example of satellite misidentification, which was particularly common in the late 1970s as low-Earth orbit satellites became more numerous but public awareness remained limited. The 45-minute observation duration is consistent with a satellite crossing the visible sky from horizon to horizon, especially during twilight conditions when satellites remain sunlit against a darkening sky. The described southeast-to-northwest trajectory aligns with typical polar or mid-inclination orbital passes visible from northern France's latitude.
The credibility factors supporting the satellite explanation include: (1) steady, non-accelerating movement, (2) high altitude with no apparent size change, (3) consistent brightness throughout observation, (4) straight-line trajectory, and (5) gradual disappearance rather than instantaneous vanishing. The absence of corroborating witnesses is not unusual for routine satellite observations, as most people would not recognize such phenomena as noteworthy. The yellow coloration mentioned by witnesses could result from atmospheric scattering effects or the satellite's solar panel reflection characteristics at specific angles. GEIPAN's "B" classification indicates confidence in the explanation while acknowledging minor uncertainties inherent in witness testimony accuracy regarding exact details like color perception.
05 Theory Comparison
BELIEVER ANALYSIS
SKEPTIC ANALYSIS
High-Altitude Aircraft Misidentification
An alternative conventional explanation could involve a high-altitude aircraft on a long-distance flight path, possibly military or commercial, with landing lights or fuselage reflecting sunlight. However, the 45-minute continuous observation and perfectly steady movement make this less likely than the satellite explanation, as aircraft would typically show some variation in brightness or slight course corrections.
06 Verdict
ANALYST VERDICT
This case is almost certainly a misidentification of an artificial satellite, likely one of the numerous reconnaissance, communications, or scientific satellites visible from France in 1978. The observed characteristics - prolonged steady movement, high altitude, consistent brightness, and linear trajectory - match satellite behavior precisely. With GEIPAN's official classification as "B" (likely explained with good data), there is high confidence in this mundane explanation. The case holds minimal significance for UFO research but serves as a useful reference for distinguishing satellite observations from genuinely anomalous aerial phenomena. The lack of additional witnesses or unusual characteristics places this firmly in the category of resolved, low-priority cases with conventional explanations.
AI CONFIDENCE SCORE:
85%
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