apastron

[uh-pas-truh n, -tron]

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).

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

[ə-păs′trən]

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.