koi55KOI -55 is a subdwarf star located in the constellation of Cygnus, The Swan.It is not part of the Cygnus constellation out but is within the borders of the constellation. Based onKOI-55 b; KOI-55 b is an exoplanet orbiting the star KOI-55. Its discovery was publicly announced on 2011. The host star KOI-55 has apparent magnitude of 14.9, with absolute magnitude of 25.0.