Almach B

Gamma2 Andromedae

Almach

Distance (Light Years) 355 ± 28
Apparent Magnitude 2.1
Color (B-V)0.03

Description of the Star

Almach B is a blue B8V main sequence star. This spectral type implies an effective temperature of 12000 K, a diameter about 3 times that of the sun, a luminosity of about 170 times that of the sun, and a mass about 5 times that of the sun.

Almach C is a white A0V main sequence star. The spectral type implies an effective temperature of 9900 K, a diameter 2.5 times that of the sun, a luminosity of about 50 times that of the sun, and a mass maybe three times that of the sun.

B and C revolve in a 61 year orbit about their common center of mass. The orbit is an elongated ellipse with a semimajor axis of about 32 AU.

Almach B and C currently appear separated by 9.58 arc seconds from A. At the distance of the star system, this corresponds to a separation of at leat 1040 AU or 26 times the radius of the solar system out to Pluto.

Almach B itself has an even closer companion than Almach C that revolves in a 2.67 day orbit.

Other Designations For This Star


Flamsteed

57 Andromedae

Hipparcos Identifier (HIP Number)


Harvard Revised (HR Number)

604

Henry Draper Catalog (HD Number)

12534

Bonner Durchmusterung (BD Number)

BD+41 395
Smithsonian Astrophysical
Observatory compendium (SAO Number)
37735

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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