Gamma Draconis


Distance (Light Years) 147.6 ± 3.1
Apparent Magnitude 2.24
Color (B-V)1.52

Names For This Star

This star is also known as Etamin, Etanin, Ettanin, Rastaban, Rasaben, or the Zenith Star.

The names of this star derive from the Arabic name Al Ras al Tinnin meaning "The Dragon's Head."

The name "Zenith Star" derives from the fact that star moves through the zenith at the latitude of the Royal Observatory in Greenwich, England.

Description of the Star

Eltanin is a cool, orange K5III giant about 200 times as luminous as the sun. The spectral type implies an effective temperature of about 3800 K, a mass of 5.0 solar masses and a diameter 25 times that of the sun.

Eltanin is a variable star fluctuating by about 0.08 magnitudes in brightness.

Other Designations For This Star


33 Draconis

Hipparcos Identifier (HIP Number)


Harvard Revised (HR Number)


Henry Draper Catalog (HD Number)


Bonner Durchmusterung (BD Number)

BD+51 2282
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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