Eta Canis Majoris


Distance (Light Years) 3200 ± 1800
Apparent Magnitude 2.45
Color (B-V)-0.08

Names For This Star

The name Aludra is derived from the Arabic Al 'Adhra the singular form of Al 'Adhara, "The Virgins." See Adhara.

Description of the Star

Aludra is a blue B5Ia supergiant star. The diameter of the star is very approximately 100 times the solar diameter. The luminosity would be on the order of 100,000 times that of the sun.

An A0V companion appears at a separation of 169 arc seconds, but according to Burnham the companion is probably not physically associated with the star.

Other Designations For This Star


31 Canis Majoris

Hipparcos Identifier (HIP Number)


Harvard Revised (HR Number)


Henry Draper Catalog (HD Number)


Bonner Durchmusterung (BD Number)

CD-29 4328
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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