apastron

[ uh-pas-truh n, -tron ]
/ əˈpæs trən, -trɒn /

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).

QUIZZES

PRACTICE SOME ESCAPISM WITH THIS WORD OF THE DAY QUIZ!

We salute you if you remember all the doovers from Word of the Day between May 25 and May 31!
Question 1 of 7
salute

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. 2020

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.