AnomalyOn December 17, 1957, four military personnel at the Cognac air base observed the appearance of a radar echo at 15:01 (UT) of an object moving from 40 km and disappearing at 16 km in the fixed echoes. The total observation time on the radar is 30 seconds, which corresponds to a speed of 2,880 km/h. The same day but at 15:45 (UT), another radar echo was noticed at 37 km and disappeared at 25 km. The total observation time lasts 15 seconds, which also corresponds to a speed of 2,880 km/h. A report illustrated with sketches is written by two witnesses. GEIPAN classifies this case as C due to lack of information (no visual observation).
Charente, France · 1957-12-17 · from the GEIPAN archive
An account in Charente, France
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This is an official case file of GEIPAN, the French space agency's unidentified aerospace phenomena office, machine translated from French. The original text and the full investigation file are at geipan.fr. We reproduce it with thanks and remove anything on request.