Epsilon Canis Majoris

Epsilon Canis Majoris, officially known as Adhara, is a binary star system and the second brightest object in the constellation of Canis Major. Its name is a Bayer designation that is Latinised from ε Canis Majoris, and shortened as Epsilon CMa or ε CMa. Adhara is the 22nd brightest star in the night sky with an apparent magnitude of 1.50. About 4.7 million years ago, it was the brightest star in the night sky, with an apparent magnitude of −3.99. Based upon parallax measurements got during the Hipparcos mission, it is about 430 light years away from the Sun.
The two stars are named ε Canis Majoris A, officially named Adhara — the traditional name of the star system, and ε Canis Majoris B.
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Category:Binary stars