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16 Cygni

A double system of two sunlike stars. The first could have another star as companion whereas the second has a planet with a highly excentric orbit.
The planet with at least 1.68 the mass of Jupiter orbits 16 Cygni B in 2.2 years within a distance of 0.6 - 2.7 AU. The surface temperature of the planet and potential moons therefore oscillates very much. Life in such a system probably is impossible to evolve.

Constellation: Cygnus
Age: 9.5 billion years
Distance: 70.5 light-years
Radial velocity: -27.4 km/sec
Space between 16 Cygni A and B: 843 AU
Orbit period of 16 Cygni A and B: 100 000 years

16 Cygni A

Spectral class: G1.5
Visual magnitude: 5.96
Luminosity: 1.68 * Sun
Mass: circa 1 * Sun
Diameter: 1.44 * Sun
 

16 Cygni B

Spectral class: G2.5
Visual magnitude: 6.21
Luminosity: 1.33 * Sun
Mass: 1.01 * Sun
Diameter: 1.19 * Sun

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    16 Cygni
Artist: Tomislav Stimac, Digital Eye

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