On May 4, 2015 at 10:05 a.m., a witness at their home observed the slow passage of a shimmering object in the sky. No other testimony was collected. This shimmering object with changing reflections, in broad daylight, moving slowly in the sky over Paris has all the characteristics of a fairground balloon (metallized mylar balloon) that escaped from its owner. These balloons come in very varied shapes and colors (do a Google image search for "mylar balloon"); once released, they spin on themselves producing very variable appearances and reflections, as seen in the witness's photos. The testimony is not precise enough to determine the balloon's trajectory and its consistency with the local wind. GEIPAN classifies this case as "B": probable observation of a child's balloon.
Paris, France · 2015-05-04 · from the GEIPAN archive
An account in Paris, 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.