[AERO CTL] COGNAC (16) 17.12.1957

On 17 December 1957 at 15:01 Universal Time, four military personnel at Cognac air base observed a radar echo moving from a range of 40 kilometres to 16 kilometres, where it disappeared into fixed echoes. The observation lasted 30 seconds. The source gives the corresponding speed as 2,880 kilometres per hour. At 15:45 Universal Time that day, another radar echo appeared at 37 kilometres and disappeared at 25 kilometres. This observation lasted 15 seconds; the source again gives a speed of 2,880 kilometres per hour. Two witnesses prepared a report illustrated with sketches. GEIPAN classified the case C because information was insufficient and there was no visual observation.