An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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surface brightness
  درخشندگی ِ رویه، ~ رویه‌ای  
deraxandegi-ye ruyé, ~ ruye-yi
Fr.: brillance de surface  

The brightness of an extended object, such as a planet, nebula, galaxy, or the sky background, expressed as magnitudes per unit area (usually square arc second). Surface brightness is calculated by dividing the object’s magnitude by its size (→ isophotal radius).

See also: → surface; → brightness.