FIGURE 3. (A, B, C, D) Distribution of Predicted Increases in Diffuse Night Sky Brightness as a Result of a 60-Satellite System. A and B show the distribution of brightness as sun at midnight, the night of the vernal equinox, from KPNO. C and D show the distribution of brightness for the assumptions used in the Workshop Briefing Document that led to an apparent visual magnitude of -4.3 (as bright as Venus) for the individual satellites. The brightness distributions in B and D are the result of increasing the brightness of the satellites by a factor of 2. The map is an equal area projection and the area enclosed with the horizon line is all of the sky that is visible at a given time from the respective observatories. The separate regions correspond to the impact threshold zones described in the text: 1) contaminated zone; 2) severe hindrance; 3) noticeable effect. Contours showing the fraction of the sky more than 30° above the horizon (z-60°) and 60° above the horizon (z=30°) are also shown for reference.
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