magnitudes per arcsec . The ST will have a baffling system which, under the conditions described above, must reduce the stray light from the Sun, Earth, 2 and Moon to less than 23 mv/arcsec , when >50° from the Sun, >70° from bright Earth and >15° from bright Moon. The details of the baffle design and stray light response are to be determined. Figure 1 shows an unofficial estimate of the amount of power (with a solar spectrum) versus off-axis angle required to produce 23 mv/arcsec in the focal plane of the ST. The SPS specular value shown on the figure corresponds to 14 full moons and represents the specular reflection from both the solar array and the microwave antenna for one satellite as described in the Briefing Document. The SPS diffuse reflection at the level described in the Briefing Document is too small to appear on the figure. The SPS is likely to have some impact on three areas of the ST: stray light, bright object avoidance, and communications. The diffuse reflection from the SPS will be negligible, except on axis. But the SPS specular reflection beam will cause the ST stray light specifications to be exceeded whenever FIGURE 1. Off-Axis Intensity Producing 23 mv/arcsec^
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