Sighting in Cergy, July 1, 2010
Val-d'Oise, Île-de-France, France
Sighting on July 1, 2010 in Cergy (Val-d'Oise, France). According to GEIPAN, it was most probably an aircraft (plane, helicopter…) (class B).
What happened
Around midnight, the witness noticed a point of light in the sky whose movement traced a chevron, or V-shaped, pattern. This was the only unusual aspect of the case. According to the witness, the pattern repeated roughly every 2 seconds.
The GEIPAN compared the account with a long-exposure photograph of an airliner, attached to the file. In it, red and white lights alternate along the line of travel, each coming on every second. The GEIPAN suggested that the witness had interpreted this alternating light as a chevron-shaped movement. The case was therefore classified B: probable observation of an aircraft.
Account rewritten by SkyUnknown from the investigation report published by GEIPAN (CNES). The original text and case documents are on the official record.
- Date
- July 1, 2010
- Location
- Cergy · town centre
- Type of sighting
- From the ground
- Source classification
- B
- Explanation
- Aircraft
Sources
- See the original document
GEIPAN (CNES)
n° 2010-07-02592
Summary written by SkyUnknown from the facts published by the source.