pericentre
/ˈpɛrɪsɛntə/Astronomy and Astronautics
noun
The point in the path of a celestial object or spacecraft orbiting around a centre at which it is nearest to the centre. Opposed to apocentre.
Origin
Late 19th century; earliest use found in Simon Newcomb (1835–1909). From peri- + centre, after perigee, perihelion.