Optical Environment about the OGO-III Satellite.
An upper limit to the brightness of the daytime sky near a large unmanned satellite has been obtained; it is some 30 times less than the darkest daytime sky yet reported by an astronaut. However, there still remains the danger that this background light (less than 5 x 10(-13) as bright as the sun) will interfere with observations of the solar corona and zodiacal light.
Wolff
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