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Identifying Unidentified Flying Objects is a difficult task due to the normally poor quality of the evidence provided by those who report sighting the objects. Nevertheless, most officially investigated UFO sightings, such as from the U.S. Air Force's Project Blue Book, have been identified as being due to honest misidentifications of natural phenomena, aircraft, or other prosaic explanations. In early U.S. Air Force attempts to explain UFO sightings, unexplained sightings routinely numbered over one in five reports. However, in early 1953, right after the CIA's Robertson Panel, percentages of unexplained sightings dropped precipitously, usually being only a few percent in any given year. When Project Blue Book closed down in 1970, only 6% of all cases were classified as being truly unidentified. UFOs that can be explained are sometimes termed "IFOs" or Identified Flying Objects. ==UFO studies== The following are some major studies undertaken during the past 50 years that reported on identification of UFOs: *Project Blue Book Special Report No. 14 (referred to further below as BBSR) was a massive statistical study the Battelle Memorial Institute did for the USAF of 3,200 UFO cases between 1952 and 1954. Of these, 22% remained were classified as unidentified (“true UFOs”). Another 69% were deemed identified (IFOs). There was insufficient information to make a determination in the remaining 9%. *The official French government UFO investigation (GEPAN/SEPRA), run within the French space agency CNES between 1977 and 2004, scientifically investigated about 6000 cases and found that 13% defied any rational explanation (UFOs), while 46% were deemed readily identifiable and 41%, lacked sufficient information for classification. *The USAF-sponsored Condon Committee study reported that all 117 cases studies were or could probably be explained. A 1971 review of the results by the American Institute of Aeronautics and Astronautics concluded that 30% of the 117 cases remained unexplained. *Of about 5,000 cases submitted to and studied by the civilian UFO organization NICAP, 16% were judged unknowns. In contrast, much more conservative numbers for the percentage of UFOs were arrived at individually by astronomer Allan Hendry, who was the chief investigator for the Center for UFO Studies (CUFOS). CUFOS was founded by astronomer Dr. Allen Hynek (who had been a consultant for the Air Force’s Project Blue Book) to provide a serious scientific investigation into UFOs. Hendry spent 15 months personally investigating 1,307 UFO reports. In 1979, Hendry published his conclusions in ''The UFO Handbook: A Guide to Investigating, Evaluating, and Reporting UFO Sightings''. Hendry admitted that he would like to find evidence for extraterrestrials but noted that the vast majority of cases had prosaic explanations. He found 89% of reports definitely or probably identifiable and only 9% unidentified. “Hardcore” cases—well-documented events which defied any conceivable conventional explanation—made up only 1.5% of the reports. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Identification studies of UFOs」の詳細全文を読む スポンサード リンク
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