CORROBORATED
CF-GEI-20100702601 CORROBORATED
The Parthenay ISS Misidentification
CASE FILE — CF-GEI-20100702601 — CASEFILES CLASSIFIED ARCHIVE
Date Date when the incident was reported or occurred
2010-07-01
Location Reported location of the sighting or event
Parthenay-de-Bretagne, Ille-et-Vilaine, France
Duration Estimated duration of the observed phenomenon
Several 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
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 July 1, 2010, at approximately 23:00 hours (11:00 PM), a single witness in Parthenay-de-Bretagne, a commune in the Ille-et-Vilaine department of Brittany, observed a luminous phenomenon traveling from west to east across the night sky. The witness reported that the object moved slowly at constant speed and produced no audible sound. The observation lasted several minutes as the light traversed the sky in a steady, predictable manner.
GEIPAN (Groupe d'Études et d'Informations sur les Phénomènes Aérospatiaux Non Identifiés), France's official UFO investigation body operated by CNES (Centre National d'Études Spatiales), investigated this report and cross-referenced it with astronomical data. The agency had published predictions for International Space Station (ISS) passes as part of a summer 2010 sky-watching feature on their website, specifically warning about potential misidentifications during this period.
The investigation concluded with high confidence that the witness observed the scheduled pass of the International Space Station. The trajectory, timing, speed characteristics, and silent movement all perfectly matched the predicted ISS transit for that location and time. GEIPAN classified this case as 'B' - a probable identification with a known phenomenon.
02 Timeline of Events
23:00
Initial Observation
Witness first notices a luminous phenomenon appearing in the western sky over Parthenay-de-Bretagne
23:00-23:05
Steady Transit Observed
Luminous object travels at constant, slow speed from west to east across the night sky. No sound detected, no deviation in course
23:05+
Object Disappears
Light fades from view as it continues eastward, consistent with ISS passing into Earth's shadow or below horizon
2010-07
Report Filed with GEIPAN
Witness submits official report to France's national UFO investigation agency
2010-07
Investigation and Correlation
GEIPAN analysts cross-reference sighting with published ISS pass predictions for summer 2010, confirming match
Post-investigation
Case Classified 'B'
GEIPAN issues probable identification verdict, classifying case as explained ISS observation
03 Key Witnesses
Anonymous Witness 1
Civilian observer
medium
Single witness in Parthenay-de-Bretagne who reported the sighting to GEIPAN. Provided accurate observational details that assisted in identification.
"Le déplacement est lent et à vitesse constante sans bruit particulier."
04 Analyst Notes -- AI Processed
This case represents a textbook example of ISS misidentification and demonstrates the value of proactive public education by space agencies. GEIPAN's foresight in publishing ISS pass predictions for summer 2010, specifically to prevent misidentifications, allowed for immediate correlation with this sighting report. The witness's description - slow, constant speed movement from west to east, silent operation, single luminous point - matches ISS visual characteristics precisely.
The credibility of the explanation is extremely high. The ISS is one of the brightest objects in the night sky (often magnitude -3 to -4), visible to the naked eye as it reflects sunlight while orbiting approximately 400 km above Earth. Its predictable orbital mechanics meant GEIPAN could definitively state whether the ISS was visible from Parthenay-de-Bretagne at 23:00 on July 1, 2010. The witness's honest reporting and the subsequent investigation demonstrate how many UFO reports stem from unfamiliarity with celestial objects rather than anomalous phenomena. The 'B' classification indicates GEIPAN considers this a probable identification with certainty above 80%.
05 Theory Comparison
BELIEVER ANALYSIS
SKEPTIC ANALYSIS
Aircraft with Landing Lights
Alternative mundane explanation could be a high-altitude aircraft with landing lights visible, though less likely given the described constant speed and silent operation at 23:00 hours. Commercial aircraft at cruising altitude can appear similar to satellites but typically show blinking navigation lights and may produce faint engine noise. However, the west-to-east trajectory and timing correlation with ISS pass makes this explanation unnecessary.
06 Verdict
ANALYST VERDICT
This case is resolved with high confidence as a misidentification of the International Space Station. The sighting occurred during a period when GEIPAN had specifically published ISS transit predictions and warnings about potential confusion. Every observed characteristic - the west-to-east trajectory, constant slow speed, lack of sound, and timing - corresponds exactly to an ISS pass. This case holds minimal significance as an unexplained phenomenon but serves as an excellent educational example of how predictable astronomical objects can be mistaken for UFOs by observers unfamiliar with satellite tracking. The transparent investigation and classification by France's official space agency demonstrates proper scientific methodology in UFO investigation.
AI CONFIDENCE SCORE:
85%
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