1. DATE 9 November 1958 2. LOCATION Brasilia, Brazil 12. CONCLUSIONS □ Was Balloon □ Probably Balloon □ Possibly Balloon □ Was Aircraft □ Probably Aircraft □ Possibly Aircraft □ Was Astronomical □ Probably Astronomical □ Possibly Astronomical 3. DATE-TIME GROUP Local 1600 GMT 09/1900Z 4. TYPE OF OBSERVATION Ground-Visual □ Ground-Radar Air Visual □ Air-Intercept Radar 5. PHOTOS □ Yes XX No 6. SOURCE Civilian 7. LENGTH OF OBSERVATION not reported 8. NUMBER OF OBJECTS one 9. COURSE not reported □ Other_______ XX Insufficient Data for Evaluation □ Unknown 10. BRIEF SUMMARY OF SIGHTING Unidentified object thought to be a flying saucer observed by 500 people. AF plane went up to 3,000 meters and object was estimated to be at 12,000 meters. No other information. 11. COMMENTS Object observed by many people. AF plane went up & saw object. Came back & could add no additional data other than that the object was well above at estimated altitude near 35,000 ft. Probably a balloon but data is not sufficient to support this conclusion. Duration not reported but object must have been in area for some time. Also no motion rptd. Insufficient data for analysis.