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apastron

[uh-pas-truh n, -tron]
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noun, plural ap·as·tra [uh-pas-truh] /əˈpæs trə/. Astronomy.
  1. the point at which the stars of a binary system are farthest apart (opposed to periastron).

Origin of apastron

< New Latin < Greek ap- ap-2 + ástron star, constellation; on the model of apogee
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
apastron in Science

apastron

[ə-păstrən]
  1. The point at which an object, such as a planet or comet, is farthest from the center of mass of the star it is orbiting. Compare periastron.
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