Periastron meaning

pĕr'ē-ăs'trən, -trŏn
The point at which an object is closest to the center of mass of the star it is orbiting.
noun
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The point at which an object, such as a planet or comet, is closest to the center of mass of the star it is orbiting.
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Origin of periastron

  • peri– Greek astron star (probably on the model of perihelion) ster-3 in Indo-European roots
    From American Heritage Dictionary of the English Language, 5th Edition