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I think 20 AU is a reasonable distance (especially using a K type star). This would already get the apparent brightness of the second sun to around -20.5; taking 10 AU as the lower limit will get t...
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I think 20 AU is a reasonable distance (especially using a K type star). This would already get the apparent brightness of the second sun to around -20.5; taking 10 AU as the lower limit will get t...