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star, named Betelgeuse B or Siwarha, would be much smaller and fainter than the red supergiant and is believed to orbit at a distance only a few times greater than the size of Betelgeuse.

Nomenclature and etymology

The star's Bayer designation is ' (Alpha Orionis), given by Johann Bayer in 1603.

The traditional name Betelgeuse was derived from the Arabic ?? ??????? "the hand of al-Jawza

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