An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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optical double star
  ستاره‌یِ دوتایی ِ دیدگانی  
setâre-ye dotâyi-ye didgâni
Fr.: étoile double optique  

A pair of stars that lie close to each other in the sky by chance, but are not physically associated, in contrast to a true → binary star.

See also: → optical; → double star.