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Hadar

Hadar or Beta Centauri is a system of three blue stars. The two bigger ones make a narrow pair of nearly identical stars.

Constellation: Centaurus
Distance: 525 light-years
Age: 12 million years
Space between Hadar A1 and A2: 2.59 AU
Orbit period of Hadar A1 and A2: 357 days
Space between Hadar A and B: 110 AU
Orbit period of Hadar A and B: 250 years

Hadar A1

Spectral class: B1
Visual magnitude A1+A2: 0.61
Luminosity: 55 000 * Sun
Mass: 15 * Sun
Diameter: 8 * Sun
 

Hadar A2

Spectral class: B1
Visual magnitude A1+A2: 0.61
Luminosity: 55 000 * Sun
Mass: 15 * Sun
Diameter: 8 * Sun
 

Hadar B

Spectral class: B8
Visual magnitude: 4
Luminosity: 1500 * Sun

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    Hadar
To the right is Hadar, left is Alpha Centauri.
Photo: Southern Astronomical Society

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