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Theta Ursae Majoris
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Star Theta Ursae Majoris

Binary star Theta Ursae Majoris is located 44 light years away from the Sun. It consists of a subgiant and a red dwarf. For now, there are no known exoplanets in this star system.
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Sun distance
44 light years
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Theta Ursae Majoris A

Subgiant, High proper motion star
Spectral class: F6IV

Location +

Ascension iconRight ascension: 9h 32m 49.818s
Declination iconDeclination: 51° 40' 29.662'' (northern hemisphere)
Parallax iconParallax: 73.828
Distance iconSun distance: 44.178 ly | 13.5 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: 141 % M Sun
| 1477 M Jupiter
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Star mass
Mass of the star Theta Ursae Majoris A is 1.41 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: 237 % R Sun
| 23.5 R Jupiter
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Star size
Radius of the star Theta Ursae Majoris A is 2.365 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: 6300 K | 1.09 T Sun
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Star temperature
Surface temperature of Theta Ursae Majoris A is 6300 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: 2.2 billions years | 0.48 Sun
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Star age
Star Theta Ursae Majoris A is 2.2 billion years old, which is about 0.48 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: 7.871 L Sun
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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): 3.2
Magnitude iconAbsolute magnitude (V): 2.5
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

Theta Ursae Majoris C

Red dwarf, , High proper motion star

Basic characteristic

temperature iconTemperature: 6300 K
 (estimate)
+
Star temperature
Surface temperature of Theta Ursae Majoris C is estimated to be 6336 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

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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Theta Ursae Majoris system structure

 Theta Ursae Majoris A
Theta Ursae Majoris C

More about Theta Ursae Majoris

       Theta 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
* tet UMa, θ Ursae Majoris, θ UMa, Theta UMa, 25 Ursae Majoris, BD+52 1401, CCDM J09329+5141A, FK5 358, GC 13157, HD 82328, HIC 46853, HIP 46853, HR 3775, IDS 09262+5208 A, PPM 32203, SAO 27289, WDS J09329+5141A, Gaia EDR3 1018776176872261248
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Frequently Asked Questions

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

The Theta Ursae Majoris system is 44 light years or 13.5 parsecs from the Sun.

What galaxy is the Theta Ursae Majoris star in?

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

How many stars are in the Theta Ursae Majoris system?

The Theta Ursae Majoris system contains 2 stars.

What type of star is the Theta Ursae Majoris?

The primary in the Theta Ursae Majoris system is a Subgiant star.

What temperature is star Theta Ursae Majoris?

The primary in the Theta Ursae Majoris system has a temperature of 6300 K. Find out more about the temperature of stars in Stellar guide
Closest stars

 G 194-47
 - 4.2 ly

G 195-57
 - 4.5 ly

2MASS J0857+5708
 - 5.8 ly

Gaia EDR3 818808375085298944
 - 6.2 ly

Iota Ursae Majoris
 1.7 M☉ 6.5 ly
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