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Gamma Cephei
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Star Gamma Cephei

Binary star Gamma Cephei is located 45 light years away from the Sun. It consists of a subgiant and a red dwarf. There is at least one exoplanet in this system.
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Sun distance
45 light years
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Gamma Cephei A

Subgiant, Spectroscopic binary
Spectral class: K1III-IVCN1 B

Location +

Ascension iconRight ascension: 23h 39m 20.591s
Declination iconDeclination: 77° 37' 59.249'' (northern hemisphere)
Parallax iconParallax: 72.517
Distance iconSun distance: 44.977 ly | 13.8 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: 127 % M Sun
| 1330 M Jupiter
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Star mass
Mass of the star Gamma Cephei A is 1.27 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: 493 % R Sun
| 49.1 R Jupiter
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Star size
Radius of the star Gamma Cephei A is 4.93 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: 4806 K | 0.83 T Sun
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Star temperature
Surface temperature of Gamma Cephei A is 4806 K, which is 83 % 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: 3.25 billions years | 0.71 Sun
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Star age
Star Gamma Cephei A is 3.25 billion years old, which is about 0.71 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: 10.48 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

Photometry

Magnitude iconApparent magnitude (V): 3.2
Magnitude iconAbsolute magnitude (V): 2.5
Absolute stellar magnitude in different parts of the electromagnetic spectrum from infrared (K band) to ultraviolet (U band).
5
10
15
20
25
30
35
K
2.1
H
1.6
J
1.2
Grp
0.8
I
0.8
G
0.6
V
0.5
Gbp
0.5
B
0.4
U
0.3

Gamma Cephei B

Red dwarf, , Spectroscopic binary
Spectral class: M4V

Basic characteristic

icon weight
Mass: 32.8 % M Sun
| 344 M Jupiter
+
Star mass
Mass of the star Gamma Cephei B is 1.27 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: 40 % R Sun
| 3.7 R Jupiter
(estimate)
+
Star size
Radius of the star Gamma Cephei B is not known. Its estimated value based on other similar stars is about 40 % 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 iconTemperature: 3300 K
 (estimate)
+
Star temperature
Surface temperature of Gamma Cephei B is estimated to be 3300 K, which is 57 % 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

Photometry

Magnitude iconAbsolute magnitude (V): -0.7
Absolute stellar magnitude in different parts of the electromagnetic spectrum from infrared (K band) to ultraviolet (U band).
5
10
15
20
25
30
35
K
2.1
H
1.6
J
1.2
Grp
0.8
I
0.8
G
0.6
V
0.5
Gbp
0.5
B
0.4
U
0.3
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Gamma Cephei system structure

 Gamma Cephei A
Gamma Cephei A b 2.05 AU 3525.6 M⊕ 903.3 days
Gamma Cephei B

More about Gamma Cephei

       Gamma Cephei can be found in northern celestial hemisphere, and it is possible to see it with naked eye. The star is easily observable from Northern America, Europe and Asia.
Other designations of this star
Errai, 35 Cep, Gl 903, Gliese 903, HR 8974, BD +76°928, HD 222404, GCTP 5725.00, SAO 10818, FK5 893, HIC 116727, HIP 116727, IRAS 23372+7721, 2MASS J23392083+7737563, TIC 367912480, TYC 4606-3584-1, Gaia EDR3 2281778105594488192
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Frequently Asked Questions

How far is the Gamma Cephei system from the Sun?

The Gamma Cephei system is 45 light years or 13.8 parsecs from the Sun.

What galaxy is the Gamma Cephei star in?

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

How many stars are in the Gamma Cephei system?

The Gamma Cephei system contains 2 stars.

What type of star is the Gamma Cephei?

The primary in the Gamma Cephei system is a Subgiant star.

What temperature is star Gamma Cephei?

The primary in the Gamma Cephei system has a temperature of 4806 K. Find out more about the temperature of stars in Stellar guide
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