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

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CODE 47 GROUP CLASSIFICATION
(Derived from the angle of elevation)
CODE 48-51 SUN BEARING ANGLE
(Calculated)
CODE 51 SUN BEARING ANGLE
X
y
0
l
-79,99° to+ 79.99°
2 +80,00° to +89,99°
3 +90,00° to +100.00°
4 +100,01° to 130.00°
X East of the Meridian
y
0
1
2
3 4
5 +130.01° to +180,00 and -180,00° to -100,01°
6 -100.00° to -90.01°
5
6
7 -90.00° to -80,00°
8
9
CODE 52 DURATION Tl1'iE UNITS
X
y
0 Days
1 Hours
2 Minutes
3 Seconds
4 5
6
7
8
9
CODE 56 OBSERVATION METHOD
X Variable
y
0 Naked eye
1 Eye glasses
2 Window
3 Windshield
4 Binocular
5 Telescope
6 Theodolite
7 Radar
8 Photographic
9 Other
X
y
0
1
2
3 4
5
6
7
8
9
7
8
9
CODE 55 DURATION GROUP CLASSIFICATION
X
y
0 5 second and less
l
6 - 10 seconds
2 11 - 30 seconds
3 31 - 60 seconds
4 61 seconds - 5 minutes
5 6 - 30 minutes
6 Over 30 minutes
7
8
9
CODE 57 SOUND
CODE 58 OBJECT COLOR
Variable
X Variable
y
Motors
0 Metallic
Jets or rockets
1 Light., glow., luminous
Explosion
2 Red
Unlike aircraft
3 Orange
Hiss, swishing, whining
4 Yellow
Rumbling
5 Green
Humming or buzzing
6 Blue
None
7 Violet
8 Black
Other
9 White
305