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Sigma2 Ursae Majoris
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Star Sigma2 Ursae Majoris

Binary star Sigma2 Ursae Majoris is located 67 light years away from the Sun. It consists of a yellow-white star and a orange star. For now, there are no known exoplanets in this star system.
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Sun distance
67 light years
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Sigma2 Ursae Majoris A

Yellow-White star
Spectral class: F7V

Location +

Ascension iconRight ascension: 9h 10m 23.586s
Declination iconDeclination: 67° 8' 1.056'' (northern hemisphere)
Parallax iconParallax: 48.740
Distance iconSun distance: 66.917 ly | 20.5 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: 131 % M Sun
| 1372 M Jupiter
+
Star mass
Mass of the star Sigma2 Ursae Majoris A is 1.31 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: 175 % R Sun
| 17.4 R Jupiter
+
Star size
Radius of the star Sigma2 Ursae Majoris A is 1.75 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: 6276 K | 1.09 T Sun
+
Star temperature
Surface temperature of Sigma2 Ursae Majoris A is 6276 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

Photometry

Magnitude iconApparent magnitude (V): 4.8
Magnitude iconAbsolute magnitude (V): 3.2
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

Sigma2 Ursae Majoris B

Orange star, High proper motion star
Spectral class: K2V

Basic characteristic

icon weight
Mass: 73 % M Sun
| 765 M Jupiter
+
Star mass
Mass of the star Sigma2 Ursae Majoris B is 1.31 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: 70 % R Sun
| 7 R Jupiter
(estimate)
+
Star size
Radius of the star Sigma2 Ursae Majoris B is not known. Its estimated value based on other similar stars is about 70 % 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: 4600 K | 0.8 T Sun
+
Star temperature
Surface temperature of Sigma2 Ursae Majoris B is 4600 K, which is 80 % 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 iconApparent magnitude (V): 10.3
Magnitude iconAbsolute magnitude (V): 8.7
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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Sigma2 Ursae Majoris system structure

 Sigma2 Ursae Majoris A
Sigma2 Ursae Majoris B

More about Sigma2 Ursae Majoris

       Sigma2 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
BD+67°577, Gl 335, Gliese 335, HD 78154, HIP 45038, HR 3616, SAO 14788, sig02 UMa, Gaia EDR3 1068982214258617216
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External sources
simbad icon
Simbad database (* sig02 UMa B)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 1068982214258617856)
Archive from the Gaia mission

Frequently Asked Questions

How far is the Sigma2 Ursae Majoris system from the Sun?

The Sigma2 Ursae Majoris system is 67 light years or 20.5 parsecs from the Sun.

What galaxy is the Sigma2 Ursae Majoris star in?

The Sigma2 Ursae Majoris is in the Milky Way galaxy just like the Sun.

How many stars are in the Sigma2 Ursae Majoris system?

The Sigma2 Ursae Majoris system contains 2 stars.

What type of star is the Sigma2 Ursae Majoris?

The primary in the Sigma2 Ursae Majoris system is a Yellow-White star star.

What temperature is star Sigma2 Ursae Majoris?

The primary in the Sigma2 Ursae Majoris system has a temperature of 6276 K. Find out more about the temperature of stars in Stellar guide
Closest stars

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 - 1.1 ly

G 234-57
 - 2.6 ly

RX J0828.6+6602
 - 5.5 ly

2MASS J0859+6341
 - 6.4 ly

c Ursae Majoris
 1.2 M☉ 6.7 ly
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