The constellation Boötes the Herdsman is an excellent target for June nights. Arcturus is the brightest star in the constellation. Chart via EarthSky.Boötes the Herdsman is a Northern Hemisphere constellation best seen in the late spring or early summer. It’s one of the largest constellations in the sky, ranking 13th out of 88. Boötes is most famous for its bright star Arcturus, which is the 4th brightest star in the night sky.