KOI-5 is a triple star system composed of three stars: KOI-5 A, KOI-5 B and KOI-5 C, orbiting 1,870 light-years away. The two dim stellar companions to KOI-5A were discovered in 2016. KOI-5 A and B orbit each other every 29 years, and KOI-5 C orbits stars A and B every 400 years. KOI-5C is physically associated with the core stellar pair with probability 99.98%.

Planetary system

Two planets orbiting one of KOI-5's stars were suspected since 2009 based on Kepler data, but KOI-5Ab was confirmed only in January 2021 after

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determined the planet is orbiting KOI-5A. The exoplanet has caused interest in the scientific community because its orbital plane is misaligned with the closer star, suggesting it gave KOI-5Ab a gravitational kick during its development, resulting in the misalignment and inward migration to the current orbit.AT LAST! CONFIRMATION OF KEPLER'S SECOND PLANETARY CANDIDATE
/ref> However, the confirmation of this planet has yet to be published in any peer-reviewed journal. A second candidate planet was initially suspected, but was later found to be a false positive.

References

{{Extrasolar-planet-stub Cygnus (constellation) G-type main-sequence stars 0005 Planetary systems with one confirmed planet J19185753+4438507 Triple star systems Planetary transit variables