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Xi Cephei Aa
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Star Xi Cephei Aa

Triple star system Xi Cephei Aa is located 97 light years away from the Sun. It is a system with 3 stars. For now, there are no known exoplanets in this star system.
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Sun distance
97 light years
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Xi Cephei Aa

White-Blue star
Spectral class: Am+F7/8V

Location +

Ascension iconRight ascension: 22h 3m 47.463s
Declination iconDeclination: 64° 37' 40.713'' (northern hemisphere)
Parallax iconParallax: 33.790
Distance iconSun distance: 96.524 ly | 29.6 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: 172.1 % M Sun
| 1803 M Jupiter
+
Star mass
Mass of the star Xi Cephei Aa is 1.721 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: 160 % R Sun
| 15.6 R Jupiter
(estimate)
+
Star size
Radius of the star Xi Cephei Aa is not known. Its estimated value based on other similar stars is about 160 % 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: 7943 K | 1.37 T Sun
+
Star temperature
Surface temperature of Xi Cephei Aa is 7943 K, which is 137 % 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: 0.2 billions years | 0.04 Sun
+
Star age
Star Xi Cephei Aa is 0.2 billion years old, which is about 0.04 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: 6.6 L Sun
+
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): 4.3
Magnitude iconAbsolute magnitude (V): 1.9
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

Xi Cephei Ab

Bright giant
Spectral class: F2III

Basic characteristic

icon weight
Mass: 51.2 % M Sun
| 536 M Jupiter
+
Star mass
Mass of the star Xi Cephei Ab is 1.721 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: 100 % R Sun
| 10.2 R Jupiter
(estimate)
+
Star size
Radius of the star Xi Cephei Ab is not known. Its estimated value based on other similar stars is about 100 % 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: 6310 K | 1.09 T Sun
+
Star temperature
Surface temperature of Xi Cephei Ab is 6310 K, which is 109 % 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: 0.525 billions years | 0.11 Sun
+
Star age
Star Xi Cephei Ab is 0.525 billion years old, which is about 0.11 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: 1.8 L Sun
+
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

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

Xi Cephei B

Yellow-White star
Spectral class: F8V

Basic characteristic

icon weight
Mass: 114 % M Sun
| 1194 M Jupiter
+
Star mass
Mass of the star Xi Cephei B is 0.512 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: 128 % R Sun
| 12.7 R Jupiter
+
Star size
Radius of the star Xi Cephei B is 1.28 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: 6123 K | 1.06 T Sun
+
Star temperature
Surface temperature of Xi Cephei B is 6123 K, which is 106 % 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: 3.98 billions years | 0.87 Sun
+
Star age
Star Xi Cephei B is 3.98 billion years old, which is about 0.87 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: 2.08 L Sun
+
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

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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Xi Cephei Aa system structure

 Xi Cephei Aa
Xi Cephei Ab
Xi Cephei B

More about Xi Cephei Aa

       Xi Cephei Aa 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
Kurhah, 17 Cephei, BD+63°1802, CCDM J22038+2407, HIP 108917, HR 8417, SAO 19827, WDS J22038+6438, HD 209790, HD 209791, ksi Cep
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Frequently Asked Questions

How far is the Xi Cephei Aa system from the Sun?

The Xi Cephei Aa system is 97 light years or 29.6 parsecs from the Sun.

What galaxy is the Xi Cephei Aa star in?

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

How many stars are in the Xi Cephei Aa system?

The Xi Cephei Aa system contains 3 stars.

What type of star is the Xi Cephei Aa?

The primary in the Xi Cephei Aa system is a White-Blue star star.

What temperature is star Xi Cephei Aa?

The primary in the Xi Cephei Aa system has a temperature of 7943 K. Find out more about the temperature of stars in Stellar guide
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