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Gamma Ursae Majoris
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Star Gamma Ursae Majoris

Binary star Gamma Ursae Majoris is located 83 light years away from the Sun. It consists of a white-blue star and a orange star. For now, there are no known exoplanets in this star system.
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Sun distance
83 light years
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Gamma Ursae Majoris A

White-Blue star
Spectral class: A0 Ve

Location +

Ascension iconRight ascension: 11h 53m 49.847s
Declination iconDeclination: 53° 41' 41.135'' (northern hemisphere)
Parallax iconParallax: 39.210
Distance iconSun distance: 83.182 ly | 25.5 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: 294 % M Sun
| 3080 M Jupiter
+
Star mass
Mass of the star Gamma Ursae Majoris A is 2.94 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: 304 % R Sun
| 30.3 R Jupiter
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Star size
Radius of the star Gamma Ursae Majoris A is 3.04 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: 9355 K | 1.62 T Sun
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Star temperature
Surface temperature of Gamma Ursae Majoris A is 9355 K, which is 162 % 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: 0.3 billions years | 0.07 Sun
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Star age
Star Gamma Ursae Majoris A is 0.3 billion years old, which is about 0.07 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: 65.255 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): 2.4
Magnitude iconAbsolute magnitude (V): 0.4
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 Ursae Majoris B

Orange star
Spectral class: K2 V

Basic characteristic

icon weight
Mass: 79 % M Sun
| 828 M Jupiter
+
Star mass
Mass of the star Gamma Ursae Majoris B is 2.94 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: 80 % R Sun
| 7.6 R Jupiter
(estimate)
+
Star size
Radius of the star Gamma Ursae Majoris B is not known. Its estimated value based on other similar stars is about 80 % 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: 4780 K | 0.83 T Sun
+
Star temperature
Surface temperature of Gamma Ursae Majoris B is 4780 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
luminosity icon
Luminosity: 0.397 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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Gamma Ursae Majoris system structure

 Gamma Ursae Majoris A
Gamma Ursae Majoris B

More about Gamma Ursae Majoris

       Gamma Ursae Majoris 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
Phad, Phecda, Phekda, Phegda, Phekha, Phacd, Fekda, γ Ursae Majoris, γ UMa, Gamma UMa, 64 Ursae Majoris, BD+54 1475, FK5 447, GC 16268, HD 103287, HIC 58001, HIP 58001, HR 4554, PPM 33292, SAO 28179
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Frequently Asked Questions

How far is the Gamma Ursae Majoris system from the Sun?

The Gamma Ursae Majoris system is 83 light years or 25.5 parsecs from the Sun.

What galaxy is the Gamma Ursae Majoris star in?

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

How many stars are in the Gamma Ursae Majoris system?

The Gamma Ursae Majoris system contains 2 stars.

What type of star is the Gamma Ursae Majoris?

The primary in the Gamma Ursae Majoris system is a White-Blue star star.

What temperature is star Gamma Ursae Majoris?

The primary in the Gamma Ursae Majoris system has a temperature of 9355 K. Find out more about the temperature of stars in Stellar guide
Closest stars

 StKM 2-809
 - 5.1 ly

Delta Ursae Majoris
 1.6 M☉ 6.9 ly

2MASS J12161235+5709275
 - 7.5 ly

UCAC4 736-053991
 - 7.6 ly

BD+51 1697
 - 7.6 ly
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