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

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CODE 50 SHAPE PARAMETER a/b
X - Variable
y
0 - o.o
l - 0.05
2 - 0.1
3 - 0.2
4 - 0 • .3
5 - 0.5
6 - 0.75
7 - 0.9
8 - 1.0
9 - Other
CODE 51 SUBTENDED VISUAL ANGLE
{Referred to sun diameter)
X - Decreased in size
y
0 - 0.1
l - 0.2
2 - 0.5
.3 - o.75
4 ... 1.0
5 - 1.5
6 - 2.0
7 - 4.0
8 - 4.0 to 10.0
9 - Other
CODE 52 LIGHT BRIGHTNESS (Intens.llzl
X Decreased
CODE 53 ANGULAR VELOCITY
X Variable
y
y
0 Sunlight on mirror
l
Sunlight on aluminum
2 Sunlight on plaster
3 Sunlight on stone
4 Sunlight on soil
5 Brighter than moon
6 Like moon
7 Duller than moon
8 Barely visible
9 Other
CODE 54 ANGULAR ACCELERATION
(Change in Angular Velocity)
X Variable
y
O Zero, v=constant
l
Increasing slowly
2 Decreasing slowly
3 Increasing fast
4 Decreasing fast
5 Increasing very fast
6 Decreasing very fast
7
8
9
293
0 Zero
1 Very slow, 1° per second
2 Slow, .3° per second
.3 Moderate, 60 per second
4 Rapid, 12° per second
5 Very fast, 30° per second
6 Extremely fast, 900 per second
7 More than 900 per second
8
9 Other
CODE 55 APPEARANCE BEARING
X
y
0 - N
1 - NE
2 - E
3 - SE
4 - s
5 - SW
6-W
7 - NW
8
9