Phenomenon type
Historical wave / cluster
Part of a documented cluster or wave (1947 summer, 1952 Washington DC, 1973 US, 1989-1990 Belgian, 2019 Roosevelt).
14 cases in the archive
- OTHER · 1990-03-30 · contestedBelgian F-16 Intercept
Two Belgian Air Force F-16s were scrambled to intercept multiple radar contacts coinciding with widespread ground reports of triangular craft. Onboard radar locks were briefly achieved but the aircraft did not establish ...
- DoD · 1973-10-18 · contestedCoyne Helicopter Encounter
A U.S. Army Reserve helicopter crewed by Capt. Lawrence Coyne and three others reported a near-collision with an unidentified cylindrical object that bathed the cockpit in green light. The crew also reported anomalous al...
- OTHER · 1973-10-11 · contestedPascagoula Encounter
Charles Hickson and Calvin Parker reported being briefly taken aboard an unidentified craft while fishing on the Pascagoula River in Mississippi. They reported the encounter to the Jackson County Sheriff's Office the sam...
- NASA · 1972-12-12 · explainedApollo 17 Lunar Anomalies
Astronaut Jack Schmitt's flash sighting near Grimaldi crater plus a separate photo showing three dots in triangular formation in the lunar sky.
- OTHER · 1960-01-01 · unresolvedNSA TOP SECRET UMBRA UAP records
334 pages of formerly Top Secret / UMBRA-compartment NSA records on UAP incidents, released to the Disclosure Foundation under FOIA appeal on May 18, 2026. The first release of UAP material at the UMBRA classification le...
- OTHER · 1953-01-14 · explainedCIA Robertson Panel report
Report of the CIA-convened Scientific Advisory Panel on Unidentified Flying Objects, chaired by physicist H.P. Robertson, January 1953. The founding document of the US government's official skeptical posture toward UAP. ...
- OTHER · 1949-02-16 · unresolvedLos Alamos green fireballs conference
Transcript of the February 16, 1949 conference at Los Alamos Scientific Laboratory at which physicists attempted to explain the green fireballs observed over New Mexico nuclear-weapons sites in late 1948 and early 1949. ...
- DoD · 1948-12-14 · explainedProject Sign progress report
Progress report of Project Sign, the US Air Force's first formal investigation into unidentified aerial phenomena. Dated December 1948. Released through PURSUE Release 04 on July 10, 2026 as DOW-UAP-D097. The immediate i...
- OTHER · 1948-12-01 · unresolvedDOE files, Sandia / Pajarito / PANTEX, 1948-1950
Three previously classified Department of Energy files covering 1948 to 1950 sightings near the United States' core nuclear weapons sites (Sandia, Los Alamos / Pajarito, and PANTEX). Released through PURSUE Release 02 on...
- DoD · 1947-07-19 · explainedArmy Flying Discs file, Lowry AFB 1947
Early Army Air Forces intelligence file on the summer 1947 'flying disc' wave, filed at Lowry Air Force Base Denver. Released through PURSUE Release 01 on May 8, 2026. The earliest US institutional UAP file in the PURSUE...
- FBI · 1947-07-08 · contestedRoswell 1947 Historical File
Historical FBI documentation related to the 1947 incident near Roswell, New Mexico, including period correspondence and press handling.
- OTHER · 1947-06-24 · contestedKenneth Arnold Sighting
Civilian pilot Kenneth Arnold reported observing nine bright crescent-shaped objects flying near Mount Rainier in Washington state at unusually high speed. His description gave rise to the term 'flying saucer.'
- FBI · 1947-06-24 · contestedFBI Flying Disc Files
FBI case file 62-HQ-83894: investigative records, eyewitness testimonies, and public reports concerning unidentified flying objects between June 1947 and July 1968.
- DoD · 1942-02-25 · explainedBattle of Los Angeles
U.S. Army anti-aircraft batteries fired more than 1,400 shells at unidentified objects over Los Angeles in the early hours of February 25, 1942, two months after the Pearl Harbor attack. A widely circulated Los Angeles T...