Project Blue Book Special Report No. 14 (Analysis of Reports of Unidentified Aerial Objects)

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TABLE A101 EVALUATION OF OBJECT SIGHTINGS BY DURATION OF SIGHTING, 1952

Evaluation | 5 SECONDS AND LESS | 6-10 SECONDS | 11-30 SECONDS | 31-60 SECONDS
Number | Per Cent | Number | Per Cent | Number | Per Cent | Number | Per Cent
Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total
0-Balloon | 1 | 5 | 6 | 0.5 | 2.7 | 3.2 | 2 | 3 | 5 | 2.5 | 3.7 | 6.2 | 4 | 6 | 10 | 2.9 | 4.3 | 7.2 | 8 | 9 | 17 | 7.0 | 7.8 | 14.8
1-Astronomical | 64 | 28 | 92 | 34.8 | 15.2 | 50.0 | 18 | 12 | 30 | 22.2 | 14.8 | 37.0 | 17 | 7 | 24 | 12.1 | 5.6 | 17.1 | 7 | 3 | 10 | 6.1 | 2.6 | 8.7
2-Aircraft | 18 | 20 | 38 | 9.8 | 10.9 | 20.7 | 16 | 8 | 24 | 19.8 | 9.9 | 29.7 | 28 | 28 | 56 | 20.0 | 20.0 | 40.0 | 21 | 17 | 38 | 18.3 | 14.8 | 33.1
3-Light Phenom. | 1 | 2 | 3 | 0.5 | 1.1 | 1.6 | 1 | 0 | 1 | 1.2 | 0.0 | 1.2 | 1 | 1 | 2 | 0.7 | 0.7 | 1.4 | 0 | 2 | 2 | 0.0 | 1.7 | 1.7
4-Birds | 1 | 3 | 4 | 0.5 | 1.6 | 2.1 | 0 | 1 | 1 | 0.0 | 1.2 | 1.2 | 1 | 0 | 1 | 0.7 | 0.0 | 0.7 | 2 | 1 | 3 | 1.7 | 0.9 | 2.6
5-Clouds, Dust, etc. | 0 | 1 | 1 | 0.0 | 5 | 0.5 | 0 | 0 | 0 | 0.0 | 1.0 | 0.0 | 0 | 2 | 2 | 0.0 | 1.4 | 1.4 | 0 | 0 | 0 | 0.0 | 0.0 | 0.0
6-Insuffic. Info. | 9 | 0 | 9 | 4.9 | 0.0 | 4.9 | 6 | 0 | 6 | 2.4 | 0.0 | 7.4 | 10 | 0 | 10 | 7.1 | 0.0 | 7.1 | 9 | 0 | 9 | 7.8 | 0.0 | 7.8
7-Psychological | 2 | 0 | 2 | 1.1 | 0.0 | 1.1 | 0 | 0 | 0 | 0.0 | 0.0 | 0.0 | 4 | 1 | 5 | 2.9 | 0.7 | 3.6 | 2 | 0 | 2 | 1.7 | 0.0 | 1.7
8-Unknown | 19 | 0 | 19 | 10.3 | 0.0 | 10.3 | 13 | 0 | 13 | 16.0 | 0.0 | 16.0 | 22 | 0 | 22 | 15.7 | 0.0 | 15.7 | 31 | 0 | 31 | 27.0 | 0.0 | 27.0
9-Other | 8 | 2 | 10 | 4.3 | 1.1 | 5.4 | 1 | 0 | 1 | 1.2 | 0.0 | 1.2 | 4 | 4 | 8 | 2.9 | 2.9 | 5.8 | 1 | 2 | 3 | 0.9 | 1.7 | 2.6
Total | 123 | 6.1 | 184 | 66.8 | 33.2 | 100. | 57 | 24 | 81 | 70.4 | 29.6 | 100. | 91 | 49 | 140 | 65.0 | 35.0 | 100. | 81 | 34 | 115 | 70.4 | 29.6 | 100.

Evaluation | 61 SECONDS - 5 MINUTES | 6-30 MINUTES | OVER 30 MINUTES | NOT STATED
Number | Per Cent | Number | Per Cent | Number | Per Cent | Number | Per Cent
Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total | Certain | Doubtful | Total
0-Balloon | 38 | 32 | 70 | 13.7 | 11.6 | 25.3 | 50 | 30 | 80 | 17.7 | 10.6 | 28.3 | 21 | 12 | 33 | 15.0 | 8.6 | 23.6 | 24 | 16 | 40 | 8.5 | 5.7 | 14.2
1-Astronomical | 2 | 6 | 8 | 0.7 | 2.2 | 2.9 | 19 | 14 | 33 | 6.7 | 4.9 | 11.6 | 20 | 13 | 33 | 14.3 | 9.3 | 23.6 | 24 | 8 | 32 | 8.5 | 2.8 | 11.3
2-Aircraft | 40 | 45 | 85 | 14.4 | 16.2 | 30.6 | 29 | 27 | 56 | 10.2 | 9.5 | 19.7 | 7 | 7 | 14 | 5.0 | 5.0 | 10.0 | 34 | 29 | 58 | 12.1 | 8.5 | 20.6
3-Light Phenom. | 5 | 2 | 7 | 1.8 | 0.7 | 2.5 | 13 | 5 | 18 | 4.6 | 1.8 | 6.4 | 1 | 2 | 3 | 0.7 | 1.4 | 2.1 | 3 | 0 | 3 | 1.1 | 0.0 | 1.1
4-Birds | 1 | 0 | 1 | 0.4 | 0.0 | 0.4 | 0 | 0 | 0 | 0.0 | 0.0 | 0.0 | 2 | 0 | 2 | 1.4 | 0.0 | 1.4 | 1 | 0 | 1 | 0.4 | 0.0 | 0.4
5-Clouds, Dust, etc. | 0 | 3 | 3 | 0.0 | 1.1 | 1.1 | 1 | 1 | 2 | 0.4 | 0.4 | 0.8 | 1 | 0 | 1 | 0.7 | 0.0 | 0.7 | 1 | 0 | 1 | 0.4 | 0.0 | 0.4
6-Insuffic. Info. | 17 | 0 | 17 | 6.1 | 0.0 | 6.1 | 24 | 0 | 24 | 8.5 | 0.0 | 8.5 | 6 | 0 | 6 | 4.3 | 0.0 | 4.3 | 67 | 0 | 67 | 23.8 | 0.0 | 23.8
7-Psychological | 4 | 3 | 7 | 1.4 | 1.1 | 2.5 | 7 | 0 | 7 | 2.5 | 0.0 | 2.5 | 4 | 1 | 5 | 2.9 | 0.7 | 3.6 | 2 | 1 | 3 | 0.7 | 0.4 | 1.1
8-Unknown | 71 | 0 | 71 | 25.6 | 0.0 | 25.6 | 51 | 0 | 51 | 18.0 | 0.0 | 18.0 | 33 | 0 | 33 | 23.6 | 0.0 | 23.6 | 63 | 0 | 63 | 22.4 | 1.0 | 22.4
9-Other | 8 | 0 | 8 | 2.9 | 0.0 | 2.9 | 10 | 2 | 12 | 3.5 | 0.7 | 4.2 | 7 | 3 | 10 | 5.0 | 2.1 | 7.1 | 12 | 1 | 13 | 4.3 | 0.4 | 4.7
Total | 186 | 91 | 277 | 67.1 | 32.9 | 100. | 204 | 79 | 283 | 72.1 | 27.9 | 100. | 102 | 38 | 140 | 72.9 | 27.1 | 100. | 231 | 50 | 281 | 82.2 | 17.8 | 100.

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