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

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TABLE A87 EVALUATION OF ALL 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 | 0.4 | 2.0 | 2.4 | 3 | 4 | 7 | 2.7 | 3.6 | 6.3 | 5 | 9 | 14 | 2.7 | 4.9 | 7.6 | 8 | 11 | 19 | 5.7 | 7.9 | 13.6
1-Astronomical | 91 | 38 | 132 | 38.4 | 15.5 | 53.9 | 29 | 15 | 44 | 25.9 | 13.4 | 39.3 | 26 | 9 | 35 | 14.1 | 4.9 | 19.0 | 10 | 5 | 15 | 7.1 | 3.6 | 10.7
2-Aircraft | 24 | 24 | 48 | 9.8 | 9.8 | 19.6 | 19 | 13 | 32 | 17.0 | 11.6 | 28.6 | 35 | 33 | 68 | 18.9 | 17.8 | 36.7 | 24 | 20 | 44 | 17.1 | 14.3 | 31.4
3-Light Phenom. | 1 | 2 | 3 | 0.4 | 0.8 | 1.2 | 1 | 0 | 1 | 0.9 | 0.0 | 0.9 | 1 | 1 | 2 | 0.5 | 0.5 | 1.0 | 0 | 2 | 2 | 0.0 | 1.4 | 1.4
4-Birds | 1 | 3 | 4 | 0.4 | 1.2 | 1.6 | 0 | 1 | 1 | 0.0 | 0.9 | 0.9 | 1 | 0 | 1 | 0.5 | 0.0 | 0.5 | 3 | 1 | 4 | 2.1 | 0.7 | 2.8
5-Clouds, Dust, etc. | 1 | 1 | 2 | 0.4 | 0.4 | 0.8 | 0 | 0 | 0 | 0.0 | 0.0 | 0.0 | 0 | 2 | 2 | 0.0 | 1.1 | 1.1 | 0 | 0 | 0 | 0.0 | 0.0 | 0.0
6-Insuffic. Info. | 11 | 0 | 11 | 4.5 | 0.0 | 4.5 | 7 | 0 | 7 | 6.2 | 0.0 | 6.2 | 11 | 0 | 11 | 5.9 | 0.0 | 5.9 | 11 | 0 | 11 | 7.9 | 0.0 | 7.9
7-Psychological | 2 | 0 | 2 | 0.8 | 0.0 | 0.8 | 0 | 0 | 0 | 0.0 | 0.0 | 0.0 | 5 | 2 | 7 | 2.7 | 1.1 | 3.8 | 2 | 0 | 2 | 1.4 | 0.0 | 1.4
8-Unknown | 26 | 0 | 26 | 10.6 | 0.0 | 10.6 | 19 | 0 | 19 | 17.0 | 0.0 | 17.0 | 33 | 0 | 33 | 17.8 | 0.0 | 17.8 | 40 | 0 | 40 | 28.6 | 0.0 | 28.6
9-Other | 9 | 2 | 11 | 3.7 | 0.8 | 4.5 | 1 | 0 | 1 | 0.9 | 0.0 | 0.9 | 4 | 8 | 12 | 2.2 | 4.3 | 6.5 | 1 | 2 | 3 | 0.7 | 1.4 | 2.1
Total | 170 | 75 | 245 | 69.4 | 30.6 | 100. | 79 | 33 | 112 | 70.5 | 29.5 | 100. | 121 | 64 | 185 | 65.4 | 34.6 | 100 | 99 | 41 | 140 | 70.7 | 29.3 | 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 | 46 | 36 | 82 | 12.7 | 7.9 | 22.6 | 62 | 45 | 107 | 16.8 | 12.2 | 29.0 | 27 | 12 | 39 | 14.4 | 6.4 | 20.8 | 35 | 22 | 57 | 8.4 | 5.3 | 13.7
1-Astronomical | 4 | 8 | 12 | 1.1 | 2.2 | 3.3 | 23 | 15 | 38 | 6.2 | 4.1 | 10.3 | 27 | 14 | 41 | 14.4 | 7.5 | 21.9 | 47 | 16 | 63 | 11.3 | 3.8 | 15.1
2-Aircraft | 57 | 56 | 113 | 15.7 | 15.4 | 31.1 | 32 | 41 | 73 | 8.6 | 11.1 | 19.7 | 11 | 9 | 20 | 5.9 | 4.8 | 10.7 | 48 | 36 | 84 | 11.5 | 8.7 | 20.2
3-Light Phenom. | 6 | 3 | 9 | 1.7 | 0.8 | 2.5 | 13 | 6 | 19 | 3.5 | 1.6 | 5.1 | 1 | 2 | 3 | 0.5 | 1.1 | 1.6 | 3 | 1 | 4 | 0.7 | 0.2 | 0.9
4-Birds | 1 | 0 | 1 | 0.3 | 0.0 | 0.3 | 0 | 0 | 0 | 0.0 | 0.0 | 0.0 | 3 | 0 | 3 | 1.6 | 0.0 | 1.6 | 4 | 0 | 4 | 1.0 | 0.0 | 1.0
5-Clouds, Dust, etc. | 1 | 7 | 8 | 0.3 | 1.9 | 2.2 | 3 | 2 | 5 | 0.8 | 0.5 | 1.3 | 4 | 0 | 4 | 2.1 | 0.0 | 2.1 | 3 | 1 | 4 | 0.7 | 0.2 | 0.9
6-Insuffic. Info. | 18 | 0 | 18 | 5.0 | 0.0 | 5.0 | 29 | 0 | 29 | 7.8 | 0.0 | 7.8 | 8 | 0 | 8 | 4.3 | 0.0 | 4.3 | 71 | 0 | 71 | 17.1 | 0.0 | 17.1
7-Psychological | 11 | 3 | 14 | 1.1 | 0.8 | 1.9 | 7 | 0 | 7 | 1.9 | 0.0 | 1.9 | 4 | 1 | 5 | 2.1 | 0.5 | 2.6 | 2 | 1 | 3 | 0.5 | 0.2 | 0.7
8-Unknown | 101 | 0 | 101 | 27.8 | 0.0 | 27.8 | 27 | 0 | 27 | 20.8 | 0.0 | 20.8 | 53 | 0 | 53 | 28.3 | 0.0 | 28.3 | 106 | 0 | 106 | 25.5 | 0.0 | 25.5
9-Other | 12 | 0 | 12 | 3.3 | 0.0 | 3.3 | 11 | 4 | 15 | 3.0 | 1.1 | 4.1 | 8 | 3 | 11 | 4.3 | 1.6 | 5.9 | 19 | 1 | 20 | 4.6 | 0.2 | 4.8
Total | 250 | 113 | 363 | 68.9 | 31.1 | 100. | 257 | 113 | 370 | 69.5 | 30.5 | 100. | 146 | 41 | 187 | 78.1 | 21.9 | 100. | 338 | 78 | 416 | 81.2 | 18.8 | 100.

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