Since 1943, the spectrum of this star has served Coordinates: 21h 43m 30.46s, +58° 46′ 48.2″ Mu Cephei (μ Cep, μ Cephei), also known as Herschel's Garnet Star, is a red supergiant or hypergiant star in the constellation Cepheus. Das Doppelsystem ist etwa 4900 Lichtjahre von unserer Erde entfernt. Zur Navigation springen Zur Suche springen. It appears garnet red and is located at the edge of the IC 1396 nebula. Mu Cephei. Mu Cephei is 283,000 times more luminous than the Sun, with an absolute visible magnitude of around M v = −7.6. It may be the largest star visible to the naked eye with an estimated radius of 1.15 billion kilometres (710 million miles) or 1,650 times that of the Sun. In fact, Mu Cephei is an extremely luminous red supergiant and one of the reddest known stars of all. Its period is approximately 2 years. VV Cephei, also known as HD 208816, is an eclipsing binary star system located in the constellation Cepheus, approximately 5,000 light years from Earth.It is both a B[e] star and shell star.. VV Cephei is an eclipsing binary with the second longest known period. Es besteht aus einem Roten Überriesen, VV Cephei A, der die Roche-Grenze überschreitet, wenn er seinem Partner – VV Cephei B, einem Blauen Riesen – am nächsten kommt. Properties [ edit ] Relative sizes of the planets in the Solar System and several well-known stars , including Mu Cephei. Zu diesem Stichwort ist kein Artikel vorhanden; möglicherweise ist der „Granatstern“ (µ Cephei) gemeint. Dann fließt Materie von ihm zu seinem blauen Partner. Mu Cephei, also is known as Herschel's Garnet Star due to its deep red colour. A red supergiant fills its Roche lobe when closest to a companion blue star, the latter appearing to be on the main sequence. The star is around 5.64 AU in radius. VV Cephei ist ein Doppelsternsystem, das sich im Sternbild Kepheus befindet. It is a semiregular variable star with a minimum magnitude of 5.1 and a maximum magnitude of 3.4.