Fourth brightest star in the sky, with a visual magnitude of -0.05. An orange star in the northern constellation Boötes, Arcturus is about 40 light-years from the sun. Because it lies relatively nearby, its diameter has been measured; it is about 23 times that of the sun.
Arcturus (α Boo / α Boötis / Alpha Boötis) is the brightest star in the constellation Boötes. With a visual magnitude of −0.05, it is also the third brightest star in the ...
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