1. The problem statement, all variables and given/known data An asteroid is discovered to have a tiny moon that orbits it in a circular path at a distance of 113 km and with a period of 41.0 h. The asteroid is roughly spherical (unusual for such a small body) with a radius of 19.3 km. a) Find the acceleration of gravity at the surface of the asteroid. b) Find escape velocity from the asteroid? 2. Relevant equations Keplers 3rd Law [itex] T^2/R^3=4 π^2/ G M [/itex] [itex] g= G M/ R^2 [/itex] 3. The attempt at a solution I started off using the first equation and solving for M. My main question is would R be just the Height of the moon, or the height of the moon, plus the radius of the asteroid?