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The distance that I have calculated

I have made these calculations thanks to the formulas that we have learned in class: 

D=10*(m-M+5/5)  where M it's  the absolute magnitude and m apparent magnitude.  M=2 and m=12.8



 D=11445 parsec.

Some researches say that the approximate distance it's of 1165,085 parsec so I think that this time my calculations have been really close.