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Mu Cephei
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Star Mu Cephei

Red hypergiant Mu Cephei is located 5930 light years away from the Sun. It is a single star of spectral class M2e Ia, that has 1920 % of solar mass. For now, there are no known exoplanets in this star system.
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Sun distance
5930 light years
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Mu Cephei

Red hypergiant
Spectral class: M2e Ia

Location +

Ascension iconRight ascension: 21h 43m 30.461s
Declination iconDeclination: 58° 46' 48.166'' (northern hemisphere)
Parallax iconParallax: 0.550
Distance iconSun distance: 5,930.109 ly | 1,818.2 pc
Star position
The position of a star tells us where it appears in the sky, similar to how we use coordinates like latitude and longitude on Earth. In astronomy, the three main coordinates are right ascension, declination and distance. .. icon More about Star position in StellarGuide

Basic characteristic

icon weight
Mass: 1920 % M Sun
| 20113 M Jupiter
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Star mass
Mass of the star Mu Cephei is 19.2 solar masses.

The mass of a star is the total amount of matter it contains. It is one of the most important properties of a star, as it determines almost everything about how the star lives, changes, and dies. In astronomy, star mass is usually measured in solar masses (M☉) — where 1 solar mass is equal to the mass of our Sun... icon More about Star mass in StellarGuide
radius icon
Size: 97200 % R Sun
| 9672.6 R Jupiter
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Star size
Radius of the star Mu Cephei is 972 solar radii.

The size of a star refers to its radius — the distance from its center to its surface. Star size is usually measured in solar radii (R☉), where 1 solar radius equals approximately 696,000 kilometers. Depending on their type and life stage, stars can be much smaller or larger than the Sun... icon More about Star size in StellarGuide
temperature icon
Temperature: 3551 K | 0.61 T Sun
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Star temperature
Surface temperature of Mu Cephei is 3551 K, which is 61 % of the temperature on the surface of the Sun.

The temperature of a star refers to the temperature at its surface, also called the photosphere. It is measured in kelvins (K), the standard unit for temperature in astronomy. A star’s temperature tells us a lot about its physical properties and where it stands in its evolutionary stage... icon More about Star temperature in StellarGuide
time icon
Age: 0.01 billions years | 0 Sun
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Star age
Star Mu Cephei is 0.01 billion years old, which is about 0 of the Sun's age.

The age of a star tells us how long it has been shining since it formed. Knowing a star’s age helps astronomers understand its life stage, how it has changed over time, and what will happen to it in the future... icon More about Star age in StellarGuide
luminosity icon
Luminosity: 269000 L Sun
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Star luminosity
Luminosity is the total amount of energy a star gives off every second. Think of it as the star’s true brightness — not just how bright it looks from Earth. This is important because some stars may appear dim simply because they are far away, not because they’re actually faint... icon More about Star luminosity in StellarGuide
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Mu Cephei system structure

 Mu Cephei

More about Mu Cephei

Star Mu Cephei is is much bigger than the Sun and temperature on its surface is around 3551 K (3278 °C), which is about 61 % of Sun's temperature.
       Mu Cephei can be found in northern celestial hemisphere.
Other designations of this star
Erakis, Herschels Garnet Star, μ Cep, HD 206936, HR 8316, BD+58°2316, HIC 107259, HIP 107259, SAO 33693
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Frequently Asked Questions

How far is the Mu Cephei system from the Sun?

The Mu Cephei system is 5930 light years or 1,818.2 parsecs from the Sun.

What galaxy is the Mu Cephei star in?

The Mu Cephei is in the Milky Way galaxy just like the Sun.

How many stars are in the Mu Cephei system?

The Mu Cephei is a single star, there are no other known stars in the system.

What type of star is the Mu Cephei?

The star Mu Cephei is a Red hypergiant star.

What temperature is star Mu Cephei?

The star Mu Cephei has an effective temperature of 3551 K. Find out more about the temperature of stars in Stellar guide
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Estimated values
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