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Xi Ursae Majoris Aa
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Star Xi Ursae Majoris Aa

Multiple star system Xi Ursae Majoris Aa is located 29 light years away from the Sun. It is a system with 5 stars. For now, there are no known exoplanets in this star system.
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Sun distance
29 light years
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Xi Ursae Majoris Aa

Yellow-White star
Spectral class: F8.5 V

Location +

Ascension iconRight ascension: 11h 18m 10.902s
Declination iconDeclination: 31° 31' 44.980'' (northern hemisphere)
Parallax iconParallax: 113.200
Distance iconSun distance: 28.812 ly | 8.8 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: 97 % M Sun
| 1016 M Jupiter
+
Star mass
Mass of the star Xi Ursae Majoris Aa is 0.97 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: 102 % R Sun
| 10.2 R Jupiter
+
Star size
Radius of the star Xi Ursae Majoris Aa is 1.02 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
luminosity icon
Luminosity: 1.21 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): 3.8
Magnitude iconAbsolute magnitude (V): 4.1
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 Ursae Majoris Ab

Red dwarf
Spectral class: M V

Basic characteristic

icon weight
Mass: 38 % M Sun
| 398 M Jupiter
+
Star mass
Mass of the star Xi Ursae Majoris Ab is 0.97 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: 32 % R Sun
| 3.2 R Jupiter
+
Star size
Radius of the star Xi Ursae Majoris Ab is 0.32 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

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 Ursae Majoris Ba

Yellow star, Spectroscopic binary
Spectral class: G2 V

Basic characteristic

icon weight
Mass: 86 % M Sun
| 901 M Jupiter
+
Star mass
Mass of the star Xi Ursae Majoris Ba is 0.38 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: 92 % R Sun
| 9.2 R Jupiter
+
Star size
Radius of the star Xi Ursae Majoris Ba is 0.92 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: 5667 K | 0.98 T Sun
+
Star temperature
Surface temperature of Xi Ursae Majoris Ba is 5667 K, which is 98 % 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: 0.79 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): 4.8
Magnitude iconAbsolute magnitude (V): 5.1
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 Ursae Majoris Bb

Red dwarf, , Spectroscopic binary
Spectral class: M V

Basic characteristic

icon weight
Mass: 14 % M Sun
| 147 M Jupiter
+
Star mass
Mass of the star Xi Ursae Majoris Bb is 0.86 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: 0.15 R Sun
(estimate)

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 Ursae Majoris C

Brown dwarf, , , Spectroscopic binary
Spectral class: T8.5

Basic characteristic

icon weight
Mass: 2 % M Sun
| 21 M Jupiter
 (estimate)
+
Star mass
The estimated mass of the star Xi Ursae Majoris C is about 2 % of the Sun's mass, or approximately 21 Jupiter 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: 10 % R Sun
| 0.9 R Jupiter
(estimate)
+
Star size
Radius of the star Xi Ursae Majoris C is not known. Its estimated value based on other similar stars is about 10 % 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: 900 K
 (estimate)
+
Star temperature
Surface temperature of Xi Ursae Majoris C is estimated to be 920 K, which is 16 % 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): 0.3
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 Ursae Majoris Aa system structure

 Xi Ursae Majoris Aa
Xi Ursae Majoris Ab
Xi Ursae Majoris Ba
Xi Ursae Majoris Bb
Xi Ursae Majoris C

More about Xi Ursae Majoris Aa

       Xi Ursae Majoris 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
WISE J111838.70+312537.9, WISE J1118+3125, ksi UMa B, Alula Australis, ξ Ursae Majoris, ξ UMa, Xi UMa, 53 Ursae Majoris, BD+32°2132, CCDM J11182+3132, GC 15537, HIP 55203, IDS 11128+3206, SAO 62484, WDS J11182+3132
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External sources
simbad icon
Simbad database (WISE J111838.70+312537.9)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)

Frequently Asked Questions

How far is the Xi Ursae Majoris Aa system from the Sun?

The Xi Ursae Majoris Aa system is 29 light years or 8.8 parsecs from the Sun.

What galaxy is the Xi Ursae Majoris Aa star in?

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

How many stars are in the Xi Ursae Majoris Aa system?

The Xi Ursae Majoris Aa system contains 5 stars.

What type of star is the Xi Ursae Majoris Aa?

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

What temperature is the Xi Ursae Majoris Aa?

The primary in the Xi Ursae Majoris Aa system has an effective temperature of K ( °C). Find out more about the temperature of stars in Stellar guide
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