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Epsilon Boötis is a very fine double with contrasting colours, a yellow primary and blue-green companion (2.7, 4.9). The position angle is 339º and separation 2.8".
Epsilon is the second brightest star in the constellation, and is easily found with the naked eye, northeast of Arcturus and forming the apex of a gentle triangle along with Arcturus and Alphecca (alpha Coronae Borealis), to the east.
Binoculars reveal several close neighbours: binoculars.
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