CORROBORATED
CF-GEI-20091202495 CORROBORATED
The Morsang-sur-Orge Green Fireball
CASE FILE — CF-GEI-20091202495 — CASEFILES CLASSIFIED ARCHIVE
Date Date when the incident was reported or occurred
2009-12-27
Location Reported location of the sighting or event
Morsang-sur-Orge, Essonne, Île-de-France, France
Duration Estimated duration of the observed phenomenon
A few seconds
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 December 27, 2009, at approximately 1:00 AM, a single witness observed from their window in Morsang-sur-Orge a rapid passage of an intense, continuous green light. The object traveled in a straight line from south to northeast across the night sky. The witness specifically noted that no sound accompanied the observation, which lasted only a few seconds. The luminous phenomenon displayed characteristics consistent with atmospheric entry: rapid rectilinear trajectory, brief duration, and distinctive green coloration.
GEIPAN (Groupe d'Études et d'Informations sur les Phénomènes Aérospatiaux Non Identifiés), France's official UAP investigation agency operated by CNES (Centre National d'Études Spatiales), classified this case as "B" - probable identification with high confidence. The investigators determined the observation exhibited all hallmarks of a meteoroid atmospheric reentry, commonly called a bolide or fireball. The green color is particularly characteristic of meteoroids containing certain metallic compounds that vaporize during atmospheric entry.
Notably, this event was not recorded by REFORME (Réseau Français d'ObseRvation de MEtéores), France's meteor observation network, suggesting it was either a smaller meteoroid that fell outside the network's coverage area, occurred in conditions not favorable for network detection, or was simply missed by network observers. The single-witness nature of the report and lack of corroborating data from the meteor observation network limited the investigation, though the described characteristics strongly support the meteoroid hypothesis.
02 Timeline of Events
2009-12-27 01:00
Initial Observation
Witness observes from their window an intense, continuous green light beginning its trajectory across the sky
01:00:02-05
South to Northeast Traverse
The green luminous object travels in a straight line from south to northeast direction across the night sky. No sound is detected during the passage
01:00:05
Object Disappears
After a few seconds of observation, the green light disappears from view, completing its atmospheric passage
Post-event
GEIPAN Investigation
GEIPAN conducts investigation, cross-references with REFORME meteor network (no detection recorded), classifies as probable meteoroid reentry
03 Key Witnesses
Anonymous Witness 1
Civilian observer
medium
Resident of Morsang-sur-Orge who observed the phenomenon from their window at approximately 1:00 AM
"Un témoin observe depuis sa fenêtre le passage rapide S-NE d'une lumière verte intense et continue. Aucun bruit n'a été remarqué durant l'observation de quelques secondes."
04 Analyst Notes -- AI Processed
This case represents a textbook example of meteoroid atmospheric reentry mistaken for an anomalous phenomenon. The witness's description is remarkably consistent with known bolide characteristics: the intense green coloration (typically caused by nickel, copper, or magnesium content in the meteoroid), the silent passage (sound waves from high-altitude events often don't reach ground observers), the brief few-second duration, and the straight-line trajectory. The south-to-northeast direction is consistent with typical meteor shower radiant patterns, though this occurred outside major December meteor shower peak periods.
The credibility of this sighting as a natural phenomenon is strengthened by GEIPAN's thorough classification system. A "B" classification indicates probable identification based on consistent evidence, though not conclusive proof (which would warrant an "A" classification). The absence of REFORME network confirmation is not unusual - many smaller meteoroids go unrecorded, particularly those occurring during early morning hours when fewer observers are active. The single witness and lack of physical evidence or photographic documentation prevent higher confidence classification. The witness appears credible in their factual reporting, noting specific details like trajectory direction and the absence of sound without embellishment.
05 Theory Comparison
BELIEVER ANALYSIS
SKEPTIC ANALYSIS
Possible Artificial Reentry
While the meteoroid explanation is most likely, an alternative hypothesis could be space debris or satellite reentry. Artificial objects reentering the atmosphere can produce similar green coloration due to copper components in electronics and wiring. The straight-line trajectory and brief duration would also be consistent with controlled or uncontrolled satellite reentry. However, no satellite reentry events were documented for this specific date and time over France, making this explanation less probable than the natural meteoroid hypothesis. The witness's description lacks the fragmentation or multiple light sources often associated with larger satellite breakups.
06 Verdict
ANALYST VERDICT
This case is almost certainly a meteoroid atmospheric reentry (bolide/fireball) rather than an anomalous aerial phenomenon. The evidence is compelling: green coloration matching known meteoroid chemistry, brief duration consistent with atmospheric entry velocities (typically 11-72 km/s), rectilinear trajectory, silent passage due to altitude, and occurrence during early morning hours when sporadic meteors are common. GEIPAN's "B" classification appropriately reflects high confidence in this explanation while acknowledging the lack of corroborating physical evidence or multiple witnesses. This case holds minimal significance for anomalous phenomenon research but serves as a useful reference example of how natural astronomical events can prompt UAP reports when witnesses are unfamiliar with bolide characteristics.
AI CONFIDENCE SCORE:
85%
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