Close Encounter Classification System

Close encounters A close encounter in ufology is an event where 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; two more sub-types of close encounters were later added by others, but these additional categories are not universally accepted by UFO researchers.

Sightings more than 500 feet (160 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 fett to reduce or eliminate the possibility of misidentifying conventional aircraft or other phenomena.

Close Encounter of the First kind
A sighting of one or more unidentified flying objects:
- Flying saucers
- Odd lights
- Aerial objects that are not attributable to human technology

Close Encounter of the Second kind
An observation of a UFO, and associated physical effects from the UFO, including:
- Heat or radiation
- Damage to terrain
- Human paralysis
- Frightened animals
- Interference with engines or TV or radio reception.
- Lost Time: a gap in one's memory associated with a UFO encounter.

Close Encounter of the Third kind
An observation of what Hynek termed "animate beings" observed in association with a UFO sighting. Hynek deliberately chose the somewhat vague term "animate beings" to describe beings associated with UFOs without making any unfounded assumptions regarding the beings' origins or nature. Hynek did not necessarily regard these beings as "extraterrestrials" or "aliens", and in his 1972 book, he further expressed discomfort with such reports, but felt a scientific obligation to include them, at the very least because they represented a sizable minority of claimed UFO encounters.

Bloecher subtypes
The UFO researcher Ted Bloecher proposed seven subtypes for the close encounters of the third kind in the Hynek's scale.
A: An entity is observed only inside the UFO
B: An entity is observed inside and outside the UFO
C: An entity is observed near to a UFO, but not going in or out.
D: An entity is observed. No UFOs are seen by the observer, but UFO activity has been reported in the area at about the same time
E: An entity is observed. But no UFOs are seen and no UFO activity has been reported in the area at that time
F: No entity or UFOs are observed, but the subject experiences some kind of "intelligent communication"
G: Abduction (same as close encounter of fourth kind)

Subtypes D, E, and F may be unrelated to the UFO phenomenon.

Close Encounter of the Fourth kind
A human is abducted by a UFO or its occupants. This type was not included in Hynek's original close encounters scale

Close Encounter of the Fifth kind
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, or Bloecher's subtype F for Third Encounters. This type was not included in Hynek's original close encounters scale.

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