exceptionally high luminosities of , or . A more recent study finds a somewhat lower luminosity of assuming the distance given in Gaia DR2. A mass loss rate of /yr has been estimated adopting a distance of 2.8 kpc. References K-type hypergiants Cephei, RW Cepheus (constellation) 212466 BD+55 2737 110504 Semiregular variable stars G-type hypergiants M-type hypergiants