Lambda Cephei [SEP] constellation
Lambda Cephei
Lambda Cephei (λ Cephei) is a fifth magnitude blue supergiant star in the constellation Cepheus, one of the hottest and most luminous visible to the naked eye.
Characteristics.
It is a hot O6.5 supergiant star at a distance of approximately 1,980 light years, whose absolute brightness around half a million times the Sun. Its radius is around 20 times that of the latter, with a mass that has been estimated to be between 45 and 60 solar masses.
Lambda Cephei turns around its axis in
Lambda Eridani
Lambda Eridani (λ Eri) is a star in the constellation Eridanus. It is visible to the naked eye on a dark night with an apparent visual magnitude of 4.25. The distance to this star, based upon an annual parallax shift of 0.00402 arcseconds, is roughly 810 light years.
λ Eri is classified in the General Catalogue of Variable Stars as a Beta Cephei variable. The AAVSO International Variable Star Index defines a LERI type of variation. λ Eri is classified as LERI + GCAS since