An account in Haute-Garonne, France

On August 4, 2011 at 10:59 PM, a witness observed a luminous point passing from south to north in the sky. He was intrigued by the zig-zag movements of the object and the variations in intensity. No noise was heard during the observation. The object disappeared from the witness's field of view. The witness's description: a white luminous point crossing the sky from south to north suggests the passage of a satellite: on this trajectory, and at the stated time, the passage of the satellite IGS1B is noted, with a magnitude of 2 (like the North Star). Its brightness changes during the passage, depending on its exposure to the sun. Of course, seen from the ground, a satellite moves strictly in a straight line (or slightly curved), which does not match the testimony. The zig-zags described by the witness may come from an optical illusion, of physiological origin, called the autokinetic illusion, which occurs when the eye follows a luminous point against a completely black background. See pages 26 and 30 of the document: /typo3conf/ext/dam_frontend/pushfile.php?docID=9932 This case is classified as B: probable observation of a satellite passage with autokinetic illusion.