AnomalyOn October 9, 2013 at around 5:45 p.m., two witnesses observed in the sky the presence of a dark flying object whose upper part was ovoid in shape, and the lower part cylindrical. It was at about 50 m in altitude and moved slowly, without noise. The observation of an object at low altitude moving steadily and silently with the wind (westerly wind that day of about 15 km/h according to Meteociel) clearly suggests a helium-filled balloon, perhaps a child's balloon. These objects have very varied shapes, and observed in the sky against the light, generally appear black. GEIPAN classifies this slightly unusual case in category "B": probable observation of a helium-filled balloon.
Oise, France · 2013-10-09 · from the GEIPAN archive
An account in Oise, 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.