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HD 188753

A triple system of sunlike stars, with 2/3 - 1 solar masses each. The A star is orbited every 3.3 days by a planet with the size of Jupiter. This is a surprise, because before it was thought that planets can't exist in close multiple systems. The planet, HD 188753 Ab, disproves this.

Constellation: Cygnus
Distance: 149 light-years
Spectral class: K0
Visual magnitude: 7.43
Space between HD 188753 A and B1/2: circa 9 AU
Orbit period of HD 188753 A and B1/2: 25.7 years
Orbit period of HD 188753 B1 and B2: 156 days

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Graphic: Nasa
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