About HR 65
HR 65 is an epic variable star. It lies about 2,398.2 light-years from Earth, sits in the constellation Cas, shines at apparent magnitude 6.11 and has spectral type O9IIInn.
Its spectrum reads O9IIInn — an O-type star — the hottest, rarest main class there is. Fewer than one star in a million is an O, and none of them lasts long.