In this case, I have to calculate the absolute magnitude.

I know that m=9

Distance= 769.8 parsec

m-M=5log (D)-5

9-M=5log (769.8)-5

9-M=9.43

9=9.43+M

M=-9.43+9

M=-0.43

I can conclude that if my calculations are ok, the absolute magnitude it's of -0.43.

I can compare my results because there is no data of the absolute magnitude of Messier 73