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