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Neutron measurements made at low altitude over the lunar south pole will allow LunaH-Map to constrain the hydrogen within permanently shadowed regions at unprecedented spatial resolution. This means you don't need to be in a polar orbit around Earth to arrive in a polar orbit at the Moon. $\endgroup$ – Suma Jan 14 '17 at 21:48 $\begingroup$ LEO to the North pole is about 6.4 km/s by my calculations, just slightly more than landing in the lower latitudes. Because LEO and the orbit of the Moon are very far apart, <2,000km and 385,000km respectively, a small change in the inclination of the starting orbit will translate to a big change at the Moon. The instability of polar orbits poses a real problem for exploration.
LunaH-Map will enter a low altitude, elliptical polar orbit and will measure the abundance of hydrogen using a new type of compact neutron spectrometer. $\begingroup$ Is it possible to get a free return trajectory when aiming for a lunar polar orbit? ... Now, if a lunar orbit is circular with the Moon at the center, the satellite travels with constant velocity—a situation that makes it vulnerable to Earth's gravitational pull.
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