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Arcturus

File:Boötes_IAU.svg · Wikimedia Commons · See Wikimedia Commons

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Arcturus

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|- bgcolor="#FFFAFA" | Note (category: variability): || H and K emission vary.

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.

AI-generated from the Wikipedia summary — may contain errors.

Wikidata facts

Part of
Boötes
Constellation
Boötes
Distance from Earth
36.7
Radius
25.4
Mass
1.3
Image
Arcturus (optical).png
Show 21 more facts
located in/on physical feature
Local Interstellar Cloud
Commons category
Arcturus
spectral class
K0III
catalog code
UBV M 20076
topic's main category
Category:Arcturus
color index
1.27
apparent magnitude
-2.911
absolute magnitude
-0.304
parallax
0.12
metallicity
-0.52
radial velocity
-4.45165
right ascension
213.915300295
declination
19.182409162
effective temperature
4291
epoch
J2000.0
stellar rotational velocity
8
surface gravity
20
right ascension component of proper motion
-1093
luminosity
215
declination component of proper motion
-1998
on focus list of Wikimedia project
Wikipedia:Vital articles/Level/4
Sources (5)

via Wikidata · CC0

~19 min read

Encyclopedic overview

13 sections
Contents
  • 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.

Excerpted from Wikipedia’s “Arcturus” article, available under the CC BY-SA 4.0 licence.

Gallery (192)

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