perisaturnium
/ˌpɛrɪsəˈtəːnɪəm/Astronomy
noun
The point in the path of a celestial object or spacecraft orbiting (or passing) Saturn at which it is nearest to the planet.
Origin
Mid 19th century; earliest use found in The Penny Cyclopaedia. From peri- + Saturn + scientific Latin -ium, after post-classical Latin perihelium perihelion.