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Errai

Errai A, or Gamma Cephei A, is an orange subgiant, orbited by a red dwarf (B). The A star has a gas planet with 1.59 times the mass of Jupiter, which orbits its star every 2.47 years in an average distance of 2.03 AU.

Constellation: Cepheus
Age: 3 billion years
Distance: 45 light-years
Space between Errai A and B: 12 - 26 AU
Orbit period of Errai A and B: 74 years

Errai A

Spectral class: K2
Visual magnitude: 3.22
Luminosity: 10.6 * Sun
Mass: 1.6 * Sun
Diameter: 4.5 * Sun
 

Errai B

Spectral class: M


Mass: 0.4 * Sun
Diameter: 0.5 * Sun

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08/26/2006

    Errai
Errai A (hidden) and B.
Photo: Fukagawa / idw / University of Jena

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