Make your own free website on

 Association for Aerial Anomaly Research and Cataloging

UFO and Paranormal Research from south-central Indiana

"Always Watching the Skies"


Search this site or the web
powered by


Site search Web search

Sighting reports, personal experiences, questions, comments or suggestions?

The Hynek UFO Classification System

hynek2.gif (50541 bytes)
Dr. J. Allen Hynek

-- Lynn Taylor

Dr. J. Allen Hynek, late founder of CUFOS* (The Center for UFO Studies), developed the following classification system for use in analyzing UFO encounters. Hynek's system is used universally today.

Nocturnal Light: A visual sighting of a light on the sky at night. About 35 - 40 % of all reports are nocturnal lights.

Nocturnal Disc**: A visual sighting of a UFO in form of a structured light seen at night.

Daylight Disc: A visual sighting of a UFO with distinct shape seen at daytime.

Radar Cases: UFOs detected on radar.

Radar Visual Cases: UFOs detected on radar and visually at the same time. About 1 - 2% of all reports are radar visual cases.

Close Encounters of the First Kind: A UFO observed within 150 yards.

Close Encounters of the Second Kind: A UFO that leaves some kind of evidence like burn marks on the ground or fragments of unknown material.

Close Encounters of the Third Kind: A UFO with visible occupants.

Close Encounters of the Fourth Kind: Abductions.

Close Encounters of the Fifth Kind: Communication between a human and an alien.


** Added to the Hynek system later.

Home                                                      Back to: Reference Materials

Copyright 1999  AAARC. All rights reserved.
Revised: May 01, 2005 .