peri·as·tron
| \ ¦perē¦astrən, -ˌsträn \
plural periastra\
-strə
\
Definition of periastron
: the point in the orbit of a star or other celestial body where it is nearest to the primary star with reference to which it is revolving
the periastron of a comet
— compare apastron
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Merriam-Webster unabridged
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