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Upsilon Cephei
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Star Upsilon Cephei

Binary star Upsilon Cephei is located 93 light years away from the Sun. It consists of a subgiant and a yellow-white star. For now, there are no known exoplanets in this star system.
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Sun distance
93 light years
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Upsilon Cephei A

Subgiant, Spectroscopic binary
Spectral class: F8IV-V

Location +

Ascension iconRight ascension: 20h 45m 21.005s
Declination iconDeclination: 57° 34' 43.215'' (northern hemisphere)
Parallax iconParallax: 35.234
Distance iconSun distance: 92.569 ly | 28.4 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: 107.1 % M Sun
| 1122 M Jupiter
+
Star mass
Mass of the star Upsilon Cephei A is 1.071 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: 150 % R Sun
| 15.2 R Jupiter
(estimate)
+
Star size
Radius of the star Upsilon Cephei A is not known. Its estimated value based on other similar stars is about 150 % 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: 6200 K
 (estimate)
+
Star temperature
Surface temperature of Upsilon Cephei A is estimated to be 6170 K, which is 107 % 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: 2.25 billions years | 0.49 Sun
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Star age
Star Upsilon Cephei A is 2.25 billion years old, which is about 0.49 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

Photometry

Magnitude iconApparent magnitude (V): 4.5
Magnitude iconAbsolute magnitude (V): 2.2
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

Upsilon Cephei B

Yellow-White star, , Spectroscopic binary
Spectral class: F9IV-V

Basic characteristic

icon weight
Mass: 104.7 % M Sun
| 1097 M Jupiter
+
Star mass
Mass of the star Upsilon Cephei B is 1.071 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: 190 % R Sun
| 18.4 R Jupiter
(estimate)
+
Star size
Radius of the star Upsilon Cephei B is not known. Its estimated value based on other similar stars is about 190 % 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: 5900 K
 (estimate)
+
Star temperature
Surface temperature of Upsilon Cephei B is estimated to be 5917 K, which is 102 % 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

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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Upsilon Cephei system structure

 Upsilon Cephei A
Upsilon Cephei B

More about Upsilon Cephei

       Upsilon 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
ups Cep, HD 198084, HIP 102431, BD+57°2240, FK5 782, GJ 9706, Gliese 9706, HR 7955, SAO 32862, Gaia DR3 2190258605992864896
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Frequently Asked Questions

How far is the Upsilon Cephei system from the Sun?

The Upsilon Cephei system is 93 light years or 28.4 parsecs from the Sun.

What galaxy is the Upsilon Cephei star in?

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

How many stars are in the Upsilon Cephei system?

The Upsilon Cephei system contains 2 stars.

What type of star is the Upsilon Cephei?

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

What temperature is the Upsilon Cephei?

The primary in the Upsilon Cephei system has an effective temperature of K ( °C). Find out more about the temperature of stars in Stellar guide
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