Friday

August 22, 2014

August 22, 2014

Posted by **Jus** on Saturday, May 16, 2009 at 1:46pm.

a) The sun appears about 1.3 x 10^10 times as brightly in our sky as does Sirius. What is the apparent magnitude of the sun?

- pre-calc -
**drwls**, Saturday, May 16, 2009 at 2:39pmThe stellar magnitude scale has not been defined correctly in this question. Actually, it is

m2 - m1 = 2.5 log(10)(b1/b2)

so that for each decrease in magnitude by 5, the brightness increases by 100.

I hesitate to answer your question because a wrong formula is being used. The actual magnitude of the sun is about -26.7. Your question is also incomplete because you would need to know the magnitude of Sirius, which is about -1.5 as I recall

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