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  • Rigel: 71 solar radii
  • Aldebaran: 44.2 solar radii.

So Rigel is almost twice the size of Aldebaran.

See related link for a pictorial of the difference (Section 5).

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13y ago

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Is Rigel brighter than Aldebaran?

yes


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Why is Rigel appears brighter than aldeberan even though aldeberan is technically brighter than Rigel?

The absolute magnitude of Rigel is -7.92 while that of Aldebaran is -6.41. This means that Rigel is approx 4 times brighter than Aldebaran - technically. So the question is based on a flawed grasp of absolute magnitude.


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