Beta Aquilae


Distance (Light Years) 44.7 ± 0.5
Apparent Magnitude 3.71
Color (B-V)0.86

Names For This Star

According to Allen, "Alshain" is derived from Persian name for Aquila, Shahin tara zed, "The Star-Striking Falcon." An alternative spelling is "Alschairn."

Description of the Star

Alshain is a binary star system. Alshain A is a yellow G8IV subgiant star about 5 times as luminous as the sun.

Alshain B is a red M3 dwarf. This star appears to be of 12th magnitude. From the spectral type, the star would have 40% of the diameter of the sun and an effective temperature of 3100 K. The dwarf would have about 1.5% of the luminosity of the sun and 30% of the sun's mass. (An apparent magnitude of 12 would imply 0.2% of the sun's luminosity.)

The observed separation of 13 seconds of arc between the components would correspond to a projected distance 180 AU, that is, about 4.5 times the radius of the solar system out to Pluto.

Other Designations For This Star


60 Aquilae

Hipparcos Identifier (HIP Number)


Harvard Revised (HR Number)


Henry Draper Catalog (HD Number)


Bonner Durchmusterung (BD Number)

BD+06 4357
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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