Gamma Cygni


Distance (Light Years) 1520 ± 360
Apparent Magnitude 2.23
Color (B-V)0.68

Names For This Star

Sadr, alternatively Sador or Sadir, derives from the Arabic name for the star Al Sadr al Dajajah, "The Hen's Breast."

The name of the star reflects the Arabic idea of the constellation of Cygnus, that is, as a hen rather than a swan.

Description of the Star

Sadr is a yellowish F8Ib supergiant star having a luminosity of perhaps 20,000 times that of the sun. The spectal type implies a mass about 10 times that of the sun and a diameter maybe 100 times that of the sun.

Other Designations For This Star


37 Cygni

Hipparcos Identifier (HIP Number)


Harvard Revised (HR Number)


Henry Draper Catalog (HD Number)


Bonner Durchmusterung (BD Number)

BD+39 4159
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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