In a question is says that Brightness = Luminosity/4πr₂ (for a star).(adsbygoogle = window.adsbygoogle || []).push({});

Procyon = 7L☉ and 11.41 light years as distance.

the equation in B= 7L☉/ 4π(11.41)₂

the answer turned out to be 0.004 L☉ watts per square light year (its a textbook question). What i don't understand is what is 7L☉, what's its value. I read that L☉ is approx the suns luminosity so i did 7(3.839 × 10^26). but still getting the wrong answer.

Thanks

vbillej

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# Solar Luminosity

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