CORROBORATED
CF-GEI-20110602771 CORROBORATED
The Annecy-le-Vieux ISS Misidentification
CASE FILE — CF-GEI-20110602771 — CASEFILES CLASSIFIED ARCHIVE
Date Date when the incident was reported or occurred
2011-06-13
Location Reported location of the sighting or event
Annecy-le-Vieux, Haute-Savoie, France
Duration Estimated duration of the observed phenomenon
approximately 2-3 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 the evening of June 13, 2011, shortly after 23:00 hours, a single witness observing from their residence in Annecy-le-Vieux, Haute-Savoie, France, reported seeing a rapidly moving luminous point traversing the night sky. The witness described the object following a descending trajectory, gradually losing intensity before disappearing behind cloud cover. No sound was associated with the observation, which lasted several minutes.
GEIPAN investigators obtained International Space Station (ISS) tracking data for the date and time in question and determined that the ISS pass was fully compatible with the witness's observation. At the time of this sighting, the European ATV2 (Automated Transfer Vehicle) was docked to the ISS, increasing the station's overall brightness. The magnitude for this particular pass was calculated at -3.5, making it exceptionally luminous and easily visible to the naked eye—brighter than most stars and planets.
The key to understanding this case lies in the witness's incomplete observation of the ISS transit. Because the witness did not observe the beginning of the pass when the station would have been at zenith (directly overhead), they only saw the latter portion of the trajectory as the ISS moved toward the horizon. This created the optical illusion of a descending object rather than recognizing it as a satellite in stable orbit passing across the sky. The fading of intensity and disappearance behind clouds is entirely consistent with the ISS moving toward the horizon where atmospheric thickness increases and cloud cover obscured the view.
02 Timeline of Events
23:00+
Initial Observation
Witness notices a bright, rapidly moving luminous point in the night sky from their residence in Annecy-le-Vieux. The object is already in motion when first spotted.
23:01-23:03
Descending Trajectory Observed
The luminous point appears to follow a descending path across the sky. In reality, this is the ISS moving from zenith toward the horizon, but the witness interprets it as descent because they missed the beginning of the pass.
23:03-23:04
Intensity Decreases
The object gradually loses brightness as it approaches the horizon, consistent with increased atmospheric interference and changing solar reflection angles.
23:04-23:05
Disappearance Behind Cloud
The luminous point disappears from view behind cloud cover. No sound is heard throughout the entire observation, consistent with a high-altitude object.
Post-incident
GEIPAN Investigation Initiated
GEIPAN investigators obtain ISS tracking files and ground trace data for June 13, 2011, confirming the station's pass over Annecy-le-Vieux matched the witness's timeframe and description.
Classification
Case Classified as 'A'
After cross-referencing orbital data showing ISS+ATV2 configuration with magnitude -3.5 at the reported time, GEIPAN conclusively classifies this as an ISS observation with certainty.
03 Key Witnesses
Anonymous Witness 1
Civilian resident
medium
Local resident of Annecy-le-Vieux who observed the phenomenon from their home. Provided honest account of what they saw, though lacking familiarity with satellite passes.
"Un point lumineux se déplaçait rapidement dans le ciel selon une trajectoire descendante, perdant de l'intensité avant de disparaître derrière un nuage. Aucun bruit particulier n'était audible."
04 Analyst Notes -- AI Processed
This case represents a textbook example of ISS misidentification, where incomplete observation led to misinterpretation of a well-understood phenomenon. GEIPAN's investigation was thorough and conclusive, cross-referencing the witness report with precise ISS orbital tracking data. The -3.5 magnitude is significant—this is extremely bright, comparable to Venus at its brightest, which explains why it attracted the witness's attention. The presence of ATV2 docked to the station would have increased the combined visual magnitude and potentially altered the appearance compared to ISS-only passes.
The witness's credibility is not in question; rather, this case illustrates how unfamiliarity with satellite passes can lead to unusual interpretations. The 'descending trajectory' description is a common perceptual error when observers catch only the tail end of an overhead satellite pass. As the ISS moved from zenith toward the horizon, perspective would naturally make it appear to descend. The gradual dimming is perfectly explained by increasing atmospheric interference and the changing angle of solar reflection as the station moved away from optimal viewing geometry. The silent nature of the observation further supports the satellite explanation, as the ISS orbits at approximately 400km altitude—far too high for any sound to reach ground observers.
05 Theory Comparison
BELIEVER ANALYSIS
SKEPTIC ANALYSIS
Perceptual Misinterpretation Due to Incomplete Observation
This case demonstrates how partial observation of a known phenomenon leads to misinterpretation. The witness's unfamiliarity with ISS passes, combined with missing the initial overhead portion, resulted in perceiving a normal satellite transit as an anomalous descending object. This is a common pattern in satellite misidentifications where observers lack reference points or context. The brightness (-3.5 magnitude) would have been striking to someone unfamiliar with ISS visibility, potentially adding to the impression of unusualness.
06 Verdict
ANALYST VERDICT
This case is definitively explained as an observation of the International Space Station with the ATV2 vehicle docked. GEIPAN's classification as 'A' (fully explained with certainty) is entirely appropriate and well-supported by the evidence. The orbital tracking data provides incontrovertible proof that the ISS was visible from Annecy-le-Vieux at the reported time with exceptional brightness. This case holds minimal significance for anomalous phenomena research but serves as an excellent educational example of how spectacular but mundane astronomical events can be misinterpreted when observers lack context or miss the beginning of the event. It demonstrates the importance of comprehensive satellite tracking databases in UAP investigation and highlights how even bright, slow-moving objects can be misidentified when observation conditions are incomplete.
AI CONFIDENCE SCORE:
85%
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