BC-4 System: 
Target : 
Triangulation Program: 
Observational Period: 
Source Material: 
Lens: Cosmotar c = 450mm Aperture A = 136mm 
PAGEOS Satellite, and to some extent ECHO I satellite (both are sunlit 
balloon satellites) 
World Net 
July 1966 - June 1968 
930 plates observed on 25 stations. 
Images 
Precision 
of 
Setting 
Single Camera 
Reductions 
Assumed Random 
Noise of 
Star Field 
Scintil 
lation 
Random 
Emulsion 
Shift 
Total 
Random 
Noise in 
System 
Polynomial 
Curve Fits 
0 
P 
P 
P 
"of Arc 
P 
P 
"of Arc 
Average 
Stars 
±1.63 
±2.97 
±0.9(c=450mm) 
±2.1 
±1.0 
±1.0 
±3.1 
±1.4 
Values 
Satellite 
±1.0 
±3.0 
— 
±2.7 
±1.2 
±1.0 
“ — — 
“ — — 
Minimum 
Stars 
±0.86 
±1.76 
±0.9 
±0.25 
±0.1* 
±1.0 
±2.0 
±0.9 
Values 
Satellite 
±0.9 
±1.4 
— 
±0.25 
±0.1 
±1.0 
— 
— 
Maximum 
Stars 
±2.50 
±5.02 
±0.9 
±4.5 
±2.1 
±1.0 
±5.1 
±2.3 
Values 
Satellite 
±1.5 
±8.4 
— 
±8.2 
±3 • 8 
±1.0 
— 
— 
^computed from formula given by Nettelblad: Scintillation in microns = Vsec z 
with K minimum = 0.05; minimum scintillation for moderate zenith distances «±0.25 micron