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Loading contentMu Cephei is a red supergiant in the constellation Cepheus (Cephei).
Class M. Cool red stars. The most common type in the galaxy, ranging from red dwarfs to red giants. Such stars have surface temperatures around 2,400–3,700 K and appear red to the eye.
| Spectral type | M2Ia |
| Luminosity class | Ia |
| Apparent magnitude | 4.23 |
| Absolute magnitude | -15.77 |
| Luminosity (Sun = 1) | 177,010,896 |
| Colour index (B−V) | 2.242 |
Values are real catalogue data; fields without a reliable value are omitted, never estimated.
A red supergiant is a colossal, cool, luminous evolved star. The largest known stars are red supergiants, and many end as supernovae.
Facts on this topic will be cited from these primary and reference sources.
Aggregated, openly-licensed star catalogue combining Hipparcos, the Yale Bright Star Catalogue, and the Gliese Catalogue of Nearby Stars.
High-precision parallax, magnitude, and position for ~118,000 stars.