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In ufology, a close encounter is an event in which a person witnesses an unidentified flying object. This terminology and the system of classification behind it was started by astronomer and UFO researcher J. Allen Hynek, and was first suggested in his 1972 book The UFO Experience: A Scientific Inquiry. He introduced the first three kinds of encounters; more sub-types of close encounters were later added by others, but these additional categories are not universally accepted by UFO researchers, mainly because they depart from the scientific rigor that Hynek aimed to bring to ufology.
Sightings more than 500 feet (150 m) from the witness are classified as "Daylight Discs," "Nocturnal Lights," or "Radar/Visual Reports." Sightings within about 500 feet are subclassified as various types of "close encounter." Hynek and others argued a claimed close encounter must occur within about 500 feet to greatly reduce or eliminate the possibility of misidentifying conventional aircraft or other known phenomena.
Hynek's scale achieved cachet with the general public when it informed elements of the 1977 film Close Encounters of the Third Kind, which is named after the third level of the scale. Posters for the film recited the three levels of the scale, and Hynek himself makes a cameo appearance near the end of the film.
Visual sightings of an unidentified flying object.
Visual sightings plus the accompanying of physical evidence.
Sightings of "occupants" in and around the UFO.
The UFO researcher Ted Bloecher proposed six subtypes for the close encounters of the third kind in the Hynek's scale.
Subtypes D, E, and F may be unrelated to the UFO phenomenon.
Jacques Vallee,[unreliable source?] Hynek's erstwhile associate, argued that a CE4 should be described as "cases when witnesses experienced a transformation of their sense of reality", so as to also include non-abduction cases where absurd, hallucinatory or dreamlike events are associated with UFO encounters.
Named by Steven M. Greer's CSETI group, these purported encounters are joint, bilateral contact events produced through the conscious, voluntary and proactive human-initiated or cooperative communication with extraterrestrial intelligence. This is very similar to some "contactees" of the 1950s who claimed regular communication with benevolent aliens.