Question $7(1$ point$)$

Astronomers discover a new planet around the star Alpha Centauri B$.$ Alpha Centauri $B$ is a star with a mass of $0\mathrm{.}907$ Solar Masses. The planet orbits one time every $545\mathrm{.}1$ days. We find that the planet is very Mars$-$like $($mass of $6\mathrm{.}39{10}^{23}kg).$ At a distance of $"$a$",$ the semi$-$major axis of the planet's orbit, how much gravitational potential energy does the planet have $($in $10^32$ J$)?$

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