perilune
/ˈpɛrɪluːn
/noun [mass noun]
The point at which a spacecraft in lunar orbit is closest to the moon. The opposite of apolune.SMART - 1 reached its closest point to the lunar surface so far - its first ‘perilune’ - at an altitude of about 5000 kilometres at 18: 48 Central European Time on 15 November.
Origin
1960s: from peri- 'around' + Latin luna 'moon', on the pattern of perigee.