Evening of 19 May into the early hours of 20 May 1986, Brazil local time; military chronology uses UTC
Outcome: Open (Unresolved). The released Brazilian air-defence account documents visual and radar reports and several interception attempts without an established identification. Its own warnings about radar limitations and unconfirmed contacts remain important; the command’s interpretation is not proof of an extraordinary origin.
One night across several regions
On the evening of 19 May 1986, reports of unusual lights and radar contacts reached Brazilian air-defence controllers. Military fighters were launched from Santa Cruz and Anápolis. The resulting episode is often called Brazil’s official UFO night, but its strongest documentary value lies in a chronology that distinguishes what each observer and radar actually reported.
The original account summarised in the released material was dated 2 June 1986. UKPX reviewed that summary as annex 2 to COMDABRA Information 01/04 of 30 June 2004, a response to a parliamentary information request. The available copy is a reproduction of Brazilian National Archives file ARX 645, hosted by an independent archive mirror.
Early reports and the first fighter
At 23:15 UTC on 19 May, the chronology records yellow, green and orange lights over São José dos Campos and radar echoes at São Paulo approach control. After midnight UTC, a civilian aircraft reported red, star-like lights. These UTC entries belong to the Brazilian evening of 19 May; they should not be mistaken for a separate event on 20 May.
The first Santa Cruz fighter took off at 01:34 UTC. Its pilot reported a white light, changes in apparent position and colour, and an airborne-radar contact at around ten to twelve nautical miles. The aircraft eventually returned because of fuel. The account contains a pursuit report; it does not provide the raw radar recordings needed to reconstruct every movement independently.
Other launches had different results
The first Anápolis fighter, airborne at 01:48 UTC, made several interception passes using its radar without a visual sighting. The reported ranges and changes in relative position were interpreted as unusual by the crew. A second Santa Cruz fighter reported a red light associated with ground-radar reports.
A further claim of thirteen plots behind a fighter was not confirmed by that fighter’s own radar or a visual observation after it turned. Two later Anápolis launches produced no contacts at all. Combining these different outcomes into a claim that every fighter visually encountered the same objects would misrepresent the source.
The military report’s own cautions
The annex explains that some radars were primarily air-traffic-control systems, rather than dedicated air-defence equipment, and that weak returns did not always become initialised tracks. Some controller assessments consequently depended on personal experience. Those are material qualifications inside the military document itself.
The final command opinion interpreted the reports as reflective, solid phenomena with behaviour suggestive of intelligence, while explicitly saying this need not imply a crew. That is an attributed interpretation of the reports, not independently demonstrated evidence of occupants, non-human intelligence or a single cause for all contacts.
Why the outcome remains Open
The reviewed official material provides a substantial investigation record but no established identification. UKPX records Open (Unresolved), with particular weight given to the distinction between visual reports, ground radar, airborne radar and unconfirmed returns.
The 2004 response also explains reporting procedures and the general limits of the archives. Its existence shows that records were retained and released; it does not mean every allegation enclosed in them became an official finding. This page treats the night as one connected case, rather than multiplying each fighter sortie into a separate mystery.
Location and map reference
São José dos Campos and wider Brazilian air-defence regions. São José dos Campos airport reference for one early reporting area. Reports also concerned other regions; this is not a single object position or the full interception route.
Sources and review
Released military documents. COMDABRA Information 01/04, 30 June 2004, all eight pages; annex 2 on PDF pages 6–8 summarises the 2 June 1986 report. Brazilian National Archives curatorial record used to check archive context. Sources and classification checked 13 November 2026.