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VV Cephei

A double system of a red supergiant and a blue star. The red one has one of the biggest diameters ever measured at a star. If it would be at the place of the Sun, it would include the orbit of Saturn. Its capacity is nearly 20 billion times that of the Sun.

Constellation: Cepheus
Distance: circa 2000 light-years
Visual magnitude: 4.91
Space between VV Cephei A and B: 16 - 25 AU
Orbit period of VV Cephei A and B: 20.4 years

VV Cephei A

Spectral class: M2
Luminosity: 315 000 * Sun
Mass: 20 * Sun
Diameter: circa 1800 * Sun
  

VV Cephei B

Spectral class: B0
Luminosity: circa 100 000 * Sun
Mass: 20 * Sun
Diameter: 10 * Sun

Back: List of big and giant stars part 2

02/28/2011

     VV Cephei
Photo: DSS2 All Sky Survey
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