Bootes constellation This constellation contains the fourth brightest star in the night sky Arcturus Alpha Bootis lower right although the third brightest Alpha Centauri is only third as it contains two bright stars that are indivisible with the naked eye As a single star Arcturus is the third brightest visible in the night sky Bootes the bear keeper forms an elongated kite figure stretching from Arcturus to upper centre At centre left is the constellation Corona Borealis the northern crown This is a small arc of stars centred on the blue star Gemma or Alphecca Alpha Coronae Borealis