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    Red Giant-icon.png Arcturusball, also known as α Boötisball (which is Latinized to Alpha Boötisball) is the brightest starball in the northern constellation of Boötesherdsperson, the fourth-brightest in the night sky, and the brightest in the northern celestial hemisphere. Together with Sirius-icon.png Spicaball and Sirius-icon.png Denebolaball (or Sirius-icon.png Regulusball, depending on the source), Red Giant-icon.png Arcturusball is part of the Spring Triangle asterism and, by extension, also of the Great Diamond along with Sirius-icon.png Cor Caroliball. When viewed from Earth-icon.png Earthball, it appears to be positioned almost at the north galactic pole of Milky Way-icon.png Milky Wayspiral.

    Located relatively close at 36.7 light-years from Sun-icon.png Sunball, Red Giant-icon.png Arcturusball is a single Red Giant-icon.png red giantball of spectral type K1.5III—an aging starball around 7.1 billion years old that has used up its core hydrogen and evolved off the main sequence. It is about the same clay as Sun-icon.png Sunball, but has expanded to 25 times its size and is around 170 times as luminous. Its diameter is 35 million kilometers.

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