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An asteroid is discovered to have a tiny moon that orbits it in a circular path at a distance of 122 km and with a period of 43 h. The asteroid is roughly spherical (unusual for such a small body) with a radius of 19 km.
(a) Find the acceleration of gravity at the surface of the asteroid.
(b) Find the escape velocity from the asteroid.
I can find the escape velocity once I calculate part a and for part a I know the formula, but how do I find M to plug in?

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