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Dubhe

The double system of a orange-red giant and a white-yellow main sequence star forms the ending of the Big Dipper and points to the pole star.

Constellation: Ursa Major
Distance: 124 light-years
Space between Dubhe A and B: 22.9 AU
Orbit period of Dubhe A and B: 44.4 years
Radial velocity: -8.9 km/sec

Dubhe A

Spectral class: K0
Visual magnitude: 1.87
Luminosity: 224 * Sun
Mass: 4 * Sun
Diameter: 30 * Sun
 

Dubhe B

Spectral class: F7
Visual magnitude: 4.81
Luminosity: 14.9 * Sun
Mass: 1.7 * Sun
Diameter: 1.3 * Sun

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    Menkar
Photo: ESO Online Digitized Sky Survey

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