Rasalhague

(RAS-al-haig)

Alpha Ophiuchi

Rasalhague

Distance (Light Years) 46.7 ± 0.6
Apparent Magnitude 2.08
Color (B-V)0.15

Names For This Star

Rasalhague, alternatively Ras Alhague, derives from the Arabic name for this star, Al Ras al Hawwa, "The Head of the Serpent-Charmer."

Description of the Star

Rasalhague is a hot, white A5III giant having 26 times the luminosity of the sun, and 2.4 times the diameter.

Rasalhague has an unseen companion revolving in an orbit at an angular separation of 0.065 arc sec from the primary, that is, just under 1 AU from the central star. The period of the orbit is 8.5 year. According to Burnham the masses would be 2.4 solar masses and 0.6 solar masses for the giant and the companion respectively.

Other Designations For This Star


Flamsteed

55 Ophiuchi

Hipparcos Identifier (HIP Number)

86032

Harvard Revised (HR Number)

6556

Henry Draper Catalog (HD Number)

159561

Bonner Durchmusterung (BD Number)

BD+12 3252
Smithsonian Astrophysical
Observatory compendium (SAO Number)
102932

Fundamental Katalog (FK5 Number)

656
 

 


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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