Alpha Arietis


Distance (Light Years) 65.9 ± 1.3
Apparent Magnitude 2.01
Color (B-V)1.15

Names For This Star

Other names for this star are Hemal, Hamul, Ras Hammel, or El Nath (obsolete).

In Arabic Aries, the Ram, is known as Al Hamal, the Sheep. The name of the star reflects the Arabic name of the constellation. The alternative name of the star, Ras Hammel, derives from the Arabic name Al Ras al Hamal, "The Head of the Sheep."

The name El Nath invites confusion with Beta Tauri, generally known as Elnath. This name derives from the Arabic name Al Natih, "The Butting One."

Hamal is Alpha Arietis, that is, the alpha star of Aries. It is therefore sometimes referred to simply as "Arietis."

Description of the Star

Hamal is a cool, orange K2-IIICa-1 giant. with a luminosity about 55 times that of the sun.

The spectral type implies a mass about 4.2 times that of the sun and a diameter about 18 times that of the sun.

Other Designations For This Star


13 Arietis

Hipparcos Identifier (HIP Number)


Harvard Revised (HR Number)


Henry Draper Catalog (HD Number)


Bonner Durchmusterung (BD Number)

BD+22 306
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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