The brightness a star would have if not attenuated by distance or intervening gas or dust. As opposed to apparent brightness which it has as measured at a distance.
Astronomers use the term intrinsic brightness to refer to how bright a star would be without the effects of distance or absorption due to interstellar dust or gas. While a bright distant star's apparent brightness might be less than a nearby dim star, due to the inverse square law for brightness, astronomers can discuss its intrinsic brightness meaning how bright the stars would be at a common distance.
The numerical value of intrinsic brightness in Chaldean Numerology is: 4
The numerical value of intrinsic brightness in Pythagorean Numerology is: 2
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"intrinsic brightness." Definitions.net. STANDS4 LLC, 2017. Web. 22 Oct. 2017. <http://www.definitions.net/definition/intrinsic brightness>.