periastron [ˌpɛrɪˈæstrɒn]
n
(Astronomy) Astronomy the point in the orbit of a body around a star when it is nearest to the star, esp applied to double-star systems
periastron (p r  - s tr n, -tr n) Plural periastra 1. The point at which two stars orbiting each other in a binary star system are closest together. 2. The point at which an object, such as a planet or comet, is closest to the star it is orbiting. Compare apastron. |
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