noun. The point in an orbit around the moon where the orbiting body is closest to the moon.

noun. The point of an elliptical lunar orbit where the distance between the satellite and the Moon is at its minimum.

noun. periapsis in orbit around the moon

"China's first lunar probe, Chang'e-1, successfully completed its first braking at perilune and entered the moon's orbit Monday morning, becoming China's first circumlunar satellite."

apolune  

periapsis  point of periapsis