Beta Ursae Minoris


Distance (Light Years) 126.4 ± 2.5
Apparent Magnitude 2.07
Color (B-V)1.47

Names For This Star

Other names for the star are Kocab or Kochah. The names of this star derive from the Arabic name Al Kaukab al Shamaliyy, "The Star of the North." The Arabic name of the star reflects an era when Kochab was nearer to the north celestial pole than Polaris.

With Kochab and Gamma Ursae Minoris are together known as "The Guardians of the Pole."

Description of the Star

Kochab is a cool, orange K4-III giant star about 190 times as luminous as the sun. This spectral implies an effective temperature of about 3600 K, a mass about 4.4 solar masses and a diameter about 20 times that of the sun.

Other Designations For This Star


7 Ursae Minoris

Hipparcos Identifier (HIP Number)


Harvard Revised (HR Number)


Henry Draper Catalog (HD Number)


Bonner Durchmusterung (BD Number)

BD+74 595
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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