hip-109017

Its story

19 Cephei is a blue O-type supergiant, among the hottest and most massive stars on record: it weighs roughly twenty solar masses and burns at temperatures above thirty thousand degrees. It belongs to the Cep OB2 association, a nest of giant stars more than two thousand light-years away, and its spectrum shifts hour by hour under the lash of its own stellar wind. When this light departed, the Roman Empire had not yet fallen.