You can read about this here: https://en.wikipedia.org/wiki/Mass_concentration_(astronomy)#Effect_of_lunar_mascons_on_satellite_orbits https://en.wikipedia.org

You can read about this here: https://en.wikipedia.org/wiki/Mass_concentration_(astronomy)#Effect_of_lunar_mascons_on_satellite_orbits https://en.wikipedia.org/wiki/Mass_concentration_(astronomy)...