Antoine Cousyn, born in Paris in 1970, is better known in the Internet world - French
and English-speaking - under the pseudonym of elevenaugust, as a reminder of the
total eclipse of the sun that he observed in the totality band in Normandy the 11
After a scientific course in high school, he gave up studying in 1988 in order to
enter the world of labor. Nevertheless, he went on with self-education in scientific
domains such as meteorology, astronomy and physics.
During the same period, he discovered the books from Jacques Vallée and J. Allen
Hynek, as well as specialized journals: « Lumières Dans La Nuit », « Phénomènes Spatiaux
» (stopped in 1977) and « Flying Saucer Review ». Puzzled by the investigation reports
published by ufologists of the time, he decided to become himself an investigator
After a break in 1999, Antoine Cousyn became interested again in the UFO phenomenon,
with the case of the Californian drones in 2007. The numerous pictures available
with this case, little known in France, led him to look closer into the problem of
photo and video analysis related to UFOs. He tried and tested the existing established
techniques on many cases he found on the Internet, year after year until now.
Today, Antoine Cousyn has to his credit around two hundred analyses of photo and
video documents of UFOs, carried out at once for IPACO, for the French CNES/GEIPAN
and at the request of individuals or of specialized groups such as MUFON.
Some of those analyses resulted in complete reports as well as in presentations and
discussions in specialized forums (see opposite).
In addition, being convinced that most cases may be explained in a rational way,
he has accumulated during the years an important collection of photographic and video
documents, replete with examples of concrete cases which illustrate various misunderstandings
(on this matter, see the section « Sample galleries / IFO gallery »).
He also took part in the resolution of numerous hoax cases, such as the « Méduse
du col de Vence » in May 2009.
Antoine Cousyn is particularly specialized in the authentication of photo/video documents,
notably through the analysis of associated metadata. In this context, he is also
requested for expertises and certifications of photo or video documents outside the
subject of UFOs, whether for legal procedures, for studies related to commercial
projects or for production companies.
At a broader level, Antoine Cousyn has been providing CNES/GEIPAN since 2013 with
contractual service for the analysis of alleged UAP cases.
At last, since 2014, Antoine Cousyn has been developing a database (CamCAT) of technical
data of cameras and lenses, fully integrated into IPACO.