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apastra

 - 2 dictionary results

ap⋅as⋅tron

  [uh-pas-truhn, -tron]
Use apastra in a Sentence
–noun, plural -tra  [-truh] . Astronomy.
the point at which the stars of a binary system are farthest apart (opposed to periastron ).
Origin:
< NL < Gk ap- ap- 2 + ástron star, constellation; on the model of apogee
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Science Dictionary
apastron   (ə-pās'trən)  Pronunciation Key 

  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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