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apastron

[ uh-pas-truhn, -tron ]
/ əˈpæs trən, -trɒn /
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noun, plural ap·as·tra [uh-pas-truh]. /əˈpæs trə/. Astronomy.

the point at which the stars of a binary system are farthest apart (opposed to periastron).

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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. 2021
  • They wouldn't live to be crushed by disappointment when the Sky Fire receded as Beta went into the long swing toward apastron.

    Oomphel in the Sky|Henry Beam Piper

Scientific definitions for apastron

apastron
[ ə-păstrən ]

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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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