Mu Cephei

Also known as mu. Cep, Erakis, μ Cep, μ Cephei, ADS 15271 A, HIP 107259, HIC 107259, HR 8316

star in the constellation Cepheus

Key facts

Constellation: Cepheus
Right ascension: 21 43 30.460
Declination: +58 ° 46 ′ 48.17 ″
Apparent magnitude v: 3.43–5.1
Evolutionary stage: Red supergiant or red hypergiant
Spectral type: M2-Ia (M2e Ia or M2 Ia+ )
U b color index: +2.42
B v color index: +2.35
Variable type: SRc

via Wikipedia infobox

Wikidata facts

Image: Mu Cephei "The Garnet Star" 2023 (Ha and OIII).png

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Article

Mu Cephei is a red supergiant or hypergiant star in the northern constellation Cepheus. It is officially named the Garnet Star; Mu Cephei is its Bayer designation, which is Latinized from μ Cephei and abbreviated Mu Cep or μ Cep. This star appears garnet red and is located at the edge of the IC 1396 nebula. It is a 4th magnitude star easily visible to the naked eye under good observing conditions. Since 1943, the spectrum of this star has served as a spectral standard by which other stars are classified.

Mu Cephei is more than 100,000 times brighter than the Sun, with an absolute visual magnitude of −7.6. It is one of the largest known stars and also one of the most luminous and massive of its kind, with a radius around or over 1,000 times that of the Sun (R☉), and were it placed in the Sun's position, it would engulf the orbits of Mars and Jupiter.