Arcturus is the brightest star in the constellation of Boötes, the fourth-brightest in the night sky, and the brightest in the northern celestial hemisphere. Together with Spica and Denebola (or Regulus, depending on the source), Arcturus is part of the Spring Triangle asterism and, by extension, also of the Great Diamond along with the star Cor Caroli. When viewed from Earth, it appears to be positioned almost at the north galactic pole of the Milky Way.

Distance to Earth: 36.66 light years
Radius: 17.671 million km
Surface temperature: 4,290 K
Magnitude: -0.04
Constellation: Boötes
Spectral type: K1.5IIIFe-0.5

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