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[uh-pas-truh n, -tron] /əˈpæs trən, -trɒn/
noun, plural apastra
[uh-pas-truh] /əˈpæs trə/ (Show IPA).
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 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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apastron in Science
  1. The point at which two stars orbiting each other in a binary star system are farthest apart.

  2. The point at which an object, such as a planet or comet, is farthest from the star it is orbiting. Compare periastron.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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