A diatomic molecule has a dipole moment of $1.2 \mathrm{~D}$. If the bond distance is $1 \mathrm{~A}^{\circ}$, then fractional charge on each atom is _________ $\times 10^{-1}$ esu.

(Given $1 \mathrm{~D}=10^{-18}$ esucm)