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Mizar & Alkor (Zeta Ursae Maioris) (Apr 12, 2004)
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| Type: |
Mizar A: Main sequence star (Class A2) /
Mizar B: Main sequence star (Class A2) / Alkor: Main sequence star (Class A5) |
| Brightness: |
Mizar A: 2.27 mag / Mizar B: 3.95 mag
Alkor: 4.1 mag |
| Visual Distance (Separation): |
Mizar A-B: 14.5" /
Mizar-Alkor: 720'' (12') |
| Distance: |
78 ly
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| Colour: |
white
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| Luminosity (Sun = 1): |
Mizar A/B: 10-30 x /
Alkor: 12 x |
| Mass (Sun = 1): |
Mizar A: 2.5 / Mizar B: 1.6 x /
Alkor: 1.6 x |
| Temperature: |
Mizar A/B: 7,500 - 9,000 degrees /
Alkor: 8,000 degrees approx. |
| Diameter: |
-
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| Notes: | |
| Both Mizar components take about 5,000 years to orbit around each other. They are about 500 AU apart. Both of the two components are also double stars. Finally, Alkor needs 750,000 years to orbit around all the four components of Mizar. | |