Saône-et-Loire, France · 2013-08-30 · from the GEIPAN archive
Photographed in Saône-et-Loire, France
The witness, wanting to do a star trail, sets his camera accordingly. The next day, he sees that he has thus captured a luminous object that remained stable, unlike the other stars, which trailed during the 5 minutes of exposure time separating the shots.
A luminous point on an astronomy photo with a long exposure most likely reveals a brief luminous event, rather than a fixed phenomenon during the 5 minutes of the exposure. This luminous point turns out, moreover, to be a small streak, revealing a partial movement during the 5 minutes of exposure.
The favored hypothesis is the reflection of the sun on a satellite: the attached "Calsky" report indicates that the satellites NOSS 3-3A and 3C were passing at that moment in the camera's field of view, culminating at 27° above the horizon (it would seem that the point on the photo is a little higher). It seems that the satellite NOSS 3-3C (28541) see: Satflare NOSS3-3C may have a more powerful and more variable brightness than NOSS3-3A (28537) see: Satflare NOSS3-3A.
The small black streak observed under the white streak when zooming in on the photo is probably a side effect of the jpeg compression ("rebound" of the white line: it is indeed a shame that the photos were not taken in "raw".
On the attached photo of the Pleiades, greatly enlarged, one sees that each star image is surrounded by a black line: it is the same compression artifact.
GEIPAN classifies this case "B": probable photograph of a satellite flare. (There remains an uncertainty about the satellite from which the flare originated).
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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.
Anomaly