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32 Cygni (Omicron-2 Cygni)

This is an eclipsing binary of the Algol type. A red giant or supergiant is orbited by a blue star. But the dimming amounts to only 0.06 magnitudes, because the blue star can shine through the thin atmosphere of the red from behind.
At the giant protuberances (eruptions) with a length of 30 solar diameters have been observed.

Constellation: Cygnus
Age: < 20 million years
Distance: 1100 light-years
Visual magnitude A and B: 3.98
Orbit period of 32 Cygni A and B: 3.143 years

32 Cygni A

Spectral class: K2
Luminosity: 11 100 * Sun
Mass: 9.7 * Sun
Diameter: 230 * Sun

32 Cygni B

Spectral class: B3

Mass: 5 * Sun
Diameter: 3.5 * Sun

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    32 Cygni
The long nebula near the star has nothing to do with it.
Photo: ESO Online Digitized Sky Survey

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