HD 223960
HD 223960 is a supergiant star in the northern constellation Cassiopeia. Its brightness varies slightly around apparent magnitude 7 which makes it hard to be seen by the naked eye even from dark skies. Parallax measurements by the Gaia spacecraft suggest a distance of around 9,600 light years.
HD 223960 is tentatively classified as an α Cygni variable; its brightness changes erratically by less than a tenth of a magnitude with a primary period of about two days. It is a hot supergiant star with a luminosity several hundred thousand times higher than the Sun's.