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d. Compute Upiter's speed when it is closest to the sun.

I believe the equation I use for this is v^2=GM(2/r - 1/a), where a is the semi-major axis and r is the distance at perihelion. I know G is usually in m^3/kg/s^2 but since I'm given units in AU and solar masses, should I convert G to AU^3/Msun/s^2?