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What is the brightness of castor?

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Answer:

Castor is the second brightest star in the constellation Gemini and one of the brightest stars in the nighttime sky.

It is a variable star and has an apparent magnitude of 1.96 / 2.91 and an absolute magnitude of 1.33 /2.28.

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First answer by Cosmospup. Last edit by Cosmospup. Contributor trust: 856 [recommend contributor ]. Question popularity: 1 [recommend question].

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Castor_(star)

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Relevant answers:

What is brightness?
the brightness of an object is the amount of light it reflects, the more it reflects the brighter it will be. Or the object could be giving out light, a vehicle head light for example
What is the difference between the apparent brightness and the absolute brightness of a star?
Apparent brightness is the optical illusion where the source of light is different while absolute brightness of a star is the aura of the star .
The brightness of a star is?
Also known as it's magnitude. The apparent magnitude is how bright it looks from the earth, while the absolute magnitude is how bright the star would be from a set distance.
How big is Castor?
Castor is in fact a binary system. Castor A is about 2.3 times larger than our Sun Castor B is about 1.6 times larger than our Sun
What is apparent brightness?
Apparent magnitude is how bright a star appears from earth. You can have two equally bright stars, but if one is much closer to the earth then that would have a greater apparent brightness.