Beta Canis Majoris


Distance (Light Years) 500 ± 50
Apparent Magnitude 1.98
Color (B-V)-0.23

Names For This Star

Other names for this star ar Murzim or Mirza. The names derive from the Arabic name Al Murzim, "The Announcer."

The name may refer to the fact that Mirzam is situated to the east of Sirius, which is the brightest star of the nighttime sky. Thus Mirzam rises before that star. So the rising of Mirzam prefigures or announces the rising of Sirius

Description of the Star

Mirzam is a hot, blue B1II-III subgiant or giant star having about 8 times the diameter of the sun and 3200 times the luminosity.

Beta Canis Majoris is the prototype star for a certain class of oscillating, variable stars characterized by a multiplicity of periods. Burnham says that there is relation between period and luminosity as with the better known Cepheid variables.

The principle period of oscillation for Mirzam is about 6 hours.

Other Designations For This Star


2 Canis Majoris

Hipparcos Identifier (HIP Number)


Harvard Revised (HR Number)


Henry Draper Catalog (HD Number)


Bonner Durchmusterung (BD Number)

BD-17 1467
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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