Beta Orionis
1
8.3
- proper noun
- Beta Orionis, also known as Rigel, shines prominently among the stars in the Orion constellation.
Examples
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Beta Orionis is easily visible in the winter night sky.
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Astronomers observe Beta Orionis to study massive star evolution.
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The team measured the luminosity of Beta Orionis using advanced telescopes.
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Beta Orionis is bright.
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Look at Beta Orionis!
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Stargazers often identify Beta Orionis as one of the most brilliant stars in the night sky.
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During winter nights, Beta Orionis is a key star for navigating the constellations.
Synonyms
2
8.2
The brightest star in the group of stars called Orion, visible from far away
Surface Forms
Morphology
beta + Orionis
This is a technical proper name using the Bayer designation (Greek letter + Latinised constellation name). Knowing 'beta' as a Greek letter does not let a B1 learner infer that it names a specific star (Rigel) or that it denotes brightness/ranking, and 'Orionis' is not a common lexical item (Latin genitive of Orion) so the overall referent is not derivable from the parts without specific astronomical knowledge. Therefore the expression is idiomatic/technical rather than transparently compositional for general learners.
Etymology
Beta Orionis comes from old star naming: Beta is a Greek letter used to mark a very bright star and Orionis means 'of Orion', the hunter in the sky. So Beta Orionis is the name given to the bright star we now call 'Rigel'.