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- The absolute magnitude defines how bright a star would be if it was observed from a distance of 10 pc. It depends on the size of the star and the amount of light emitted by the star.
- Absolute magnitude defines the luminosity of a star on a logarithmic scale. Thus calculating absolute magnitude helps us to directly compare different stars.
- The absolute magnitude is given by,
Here L is the luminosity of the star and L0 is the zero-point luminosity and has a value of 3.0128 × 1028 W.
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