(al-BEER-ee-oh )

Beta1 Cygni


Distance (Light Years) 386 ± 26
Apparent Magnitude 3.05
Color (B-V)1.13

Names For This Star

The name of this star looks Arabic, but it isn't. Actually the name of this seems to derive from the Latin phrase ab ireo applied to the constellation of Cygnus in the 1515 edition of Ptolemy's Almagest.

Description of the Star

Burnham describes Albireo as one of the most beautiful double stars in the sky, consisting of a bright "golden yellow" primary with a blue or "sapphire" companion.

The brighter star Albireo A is a K3II bright giant. This type of star is cooler than the sun, with an effective temperature of approximately 4100 K. It is probably about 20 times larger in radius than the sun and 100 times as luminous.

The The Bright Star Catalog suggests additional components at separations from A well under one sec of arc. The Hipparcos Catalog lists a C component at a separation of 0.389 seconds of arc (46 AU separation at the distance of the star). The C component is some 2 magnitudes dimmer than A.

Other Designations For This Star


6 Cygni

Hipparcos Identifier (HIP Number)


Harvard Revised (HR Number)


Henry Draper Catalog (HD Number)


Bonner Durchmusterung (BD Number)

BD+27 3410
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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