optical double star

optical double star

noun
See under double star.
Dictionary.com Unabridged

double star

noun Astronomy.
two stars that appear as one if not viewed through a telescope with adequate magnification, such as two stars that are separated by a great distance but are nearly in line with each other and an observer (optical double star) or those that are relatively close together and comprise a single physical system (physical double star)
Compare binary star.


Origin:
1775–85

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
double star
 
n
binary star See also optical double star two stars, appearing close together when viewed through a telescope; either physically associated (binary star) or not associated (optical double star)

optical double star
 
n
Compare binary star two stars that appear close together when viewed through a telescope but are not physically associated and are often separated by a great distance

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
double star  
See binary star.
The American Heritage® Science Dictionary
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