Arcturus
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AI overview
I don't have enough context to write an accurate 2-sentence overview. The provided information only mentions that Arcturus shows variable H and K emission, which is a technical detail insufficient for a general reader to understand what Arcturus is or why it matters.
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Article
13 sectionsContents
- Nomenclature
- Observational history
- Observation
- Physical characteristics
- Spectrum
- Oscillations
- Search for planets
- Mythology
- Cultural significance
- In popular culture
- References
- Further reading
- External links
|- bgcolor="#FFFAFA" | Note (category: variability): || H and K emission vary.
Arcturus is a red giant star in the northern constellation of Boötes, and the brightest star in the constellation. It has the Bayer designation α Boötis, which is Latinized to Alpha Boötis and abbreviated Alf Boo or α Boo. With an apparent visual magnitude of −0.05, it is the fourth-brightest star in the night sky and the brightest in the northern celestial hemisphere. Arcturus forms one corner of the Spring Triangle asterism.