Epsilon Canis Majoris


Distance (Light Years) 431 ± 32
Apparent Magnitude 1.5
Color (B-V)-0.21

Names For This Star

The name of this star may also be written as "Adara".

The name comes from the Arabic. The Arabs designated four stars Epsilon, Delta, Eta, and Omicron Canis Majoris as Al `Adhara, meaning The Virgins. In modern astronomy the Arabic phrase has been abbreviated to "Adhara" (or "Adara") and applied to the Epsilon star only.

Description of the Star

Adhara is a blue B2II bright giant approximately 11 times the diameter of the sun.

Burnham gives the luminosity as 9000 times that of the sun. According to Burnham there is an eighth magnitude companion. At the distance of Adhara, the companion would lie at least 1000 AU away from the primary, but no change in the relative position of the two stars has been observed in more than a century.

Burnham lists Adhara as the twenty-second brightest star in the sky.

Other Designations For This Star


21 Canis Majoris

Hipparcos Identifier (HIP Number)


Harvard Revised (HR Number)


Henry Draper Catalog (HD Number)


Bonner Durchmusterung (BD Number)

CD-28 3666
Smithsonian Astrophysical
Observatory compendium (SAO Number)

Fundamental Katalog (FK5 Number)



Copyright © 1998 - 2010 by Arnold V. Lesikar,
Professor Emeritus
Dept. of Physics, Astronomy, and Engineering Science,
St. Cloud State University,St. Cloud, MN 56301-4498

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