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Calculating absolute magnitude

  • Thread starter edoarad
  • Start date
  • #1
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Sirius A has an apperant magnitude of -1.5, and his distance from us is 2.6 pc. the sun has an apperent magnitude of -26.8 and a distance of 1 AU.
what is Sirius's absolute magnitude?
how meny times is Sirius brighter then the sun?



m1-m2=-2.5lg(f1/f2)
this is the equation i'm supposed to use, its the one they gave me.
i think it is much more oppropriate to use:
m-M=5lg(d)-5
and then just dividing to find how much brighter he is.

so, what unit does the distance "d" needs to be in? and how do i calculate the answers with the first equation?
and what is flux? i couldnt get a clear explanation anywhere.
 

Answers and Replies

  • #2
19
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can someone please help me?
 

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