An account in Haute-Savoie, France

On Saturday, June 5, 2010, around midnight, a witness observed for 5 to 6 seconds the silent passage of a yellow glowing ball surrounded by an orange halo. The trajectory was south-north. The described phenomenon very strongly resembles a Thai lantern, which can be found commercially in various colors. The fireworks observed by the witness also suggest that that night was an occasion for various festivities. The linear trajectory is characteristic of this type of observation; but the wind was blowing from the north at midnight (recorded at the airport), which does not allow the lantern hypothesis to be confirmed. Nevertheless, in mountainous areas, with light wind, local breezes can be oriented differently from one valley to another. Of low strangeness but good consistency thanks to a good account of the facts, this observation case has many characteristics of a Thai lantern, but the lack of local wind data does not allow this hypothesis to be confirmed. This case is classified as C due to the lack of very precise weather data, independent testimonies, and cross-checks.

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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.