(al-DER-ah-min )

Alpha Cephei


Distance (Light Years) 48.80 ± 0.36
Apparent Magnitude 2.45
Color (B-V)0.22

Names For This Star

The name of this star is derived from the Arabic phrase Al Dhira al Yamin meaning "The Right Arm". This would be apparently the right arm of the king whom the constellation represents.

The name of the star may also be written as "Alderaimin."

Description of the Star

Alderamin is a white A7V main sequence star. From the spectral type a temperature of about 8100 K may be inferred. The star would be probably about 1.5 times larger in diameter than the sun and maybe 9 times more luminous.

Other Designations For This Star


5 Cephei

Hipparcos Identifier (HIP Number)


Harvard Revised (HR Number)


Henry Draper Catalog (HD Number)


Bonner Durchmusterung (BD Number)

BD+61 2111
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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