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Aldebaran

The brightest star in Taurus is a double double star.
A orange-red giant (Aldebaran A) is orbited by a red dwarf (B). Opposite to this pair in great distance is another pair of bigger red dwarfs (C+D).

Constellation: Taurus
Distance: 65.1 light-years
Space between Aldebaran A and B: 607 AU
Space between Aldebaran C and D: 33.9 AU
Space between Aldebaran A/B and C/D: 2430 AU
Radial velocity: 54.5 km/sec

Aldebaran A

Spectral class: K5
Visual magnitude: 0.87
Luminosity: 156 * Sun
Mass: 2.5 * Sun
Diameter: 51.5 * Sun
 

Aldebaran B

Spectral class: M2
Visual magnitude: 13.50
Luminosity: 0.0014 * Sun
Mass: 0.15 * Sun
Diameter: 0.36 * Sun
 

Aldebaran C & D

Spectral class: K5
Visual magnitude: 11.20
Luminosity: 0.011 * Sun

Back: List of big and giant stars
    Aldebaran and Hyades
Aldebaran and the Hyades.
Photo: T. Credner & S. Kohle, AlltheSky.com

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