U.S. Air Force Analysis of Flying Objects in the United States, 101-172

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CONFIDENTIAL

CHECK-LIST - UNIDENTIFIED FLYING OBJECTS

Incident # 141
3/3/48

1. Date 30 June 1948

2. Time 11:25 A. M., to 1:27 PM and shortly thereafter

3. Location Hecla, South Dakota

4. Name of observer Norman Pfitzenreuter

5. Occupation of observer Chemical Engineer - Amateur Astronomer

6. Address of observer Hecla, South Dakota

7. Place of observation Between Watertown, S. D., & Webster, S. D.

8. Number of objects 1

9. Distance of object from observer N/S

10. Time in sight Slightly over two hours

11. Altitude 150 miles (?)

12. Speed Stationary

13. Direction of flight Stationary

14. Tactics Remained in one/position then disintegrated approx

15. Sound None

16. Size N/S

17. Color Like polished aluminum

18. Shape Changing

19. Odor detected None

20. Apparent construction Seemed to be a cluster of parts

21. Exhaust trails Particles of disintegrating mass left very faint trails of vapor

22. Weather conditions Brilliantly clear (CAVU) - Wind velocity 3 MPH

23. Effect on clouds No clouds

24. Sketches or photographs Map showing locations of sightings

25. Manner of disappearance Disintegrated into smaller pieces

26. Remarks: Object appeared as cluster of parts which remained fairly stationary and constant for some two hours when it underwent a rather slow change in shape. A large chunk fell off. Within the next 2-1/2 minutes the entire spot started to very slowly disintegrate. Three larger parts moved (over) 75