Tags: Star.
31 Cygni also known as Omicron1 Cygni or V695 Cygni is a star in the constellation Cygnus. An Algol-type eclipsing binary it ranges between magnitudes 3.73 and 3.89 over a period of ten years; the component stars are an orange supergiant of spectrial type K4Iab and a blue-white star likely to be evolving off the main sequence with a spectral type of B4IV-V.