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Beta Ursae Majoris
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Star Beta Ursae Majoris

White-Blue star Beta Ursae Majoris is located 84 light years away from the Sun. It is a single star of spectral class A1IVps, that has 270 % of solar mass. For now, there are no known exoplanets in this star system.
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Sun distance
84 light years
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Beta Ursae Majoris

White-Blue star, High proper motion star
Spectral class: A1IVps

Location +

Ascension iconRight ascension: 11h 1m 50.642s
Declination iconDeclination: 56° 22' 57.279'' (northern hemisphere)
Parallax iconParallax: 38.603
Distance iconSun distance: 84.490 ly | 25.9 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: 270 % M Sun
| 2828 M Jupiter
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Star mass
Mass of the star Beta Ursae Majoris is 2.7 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: 302 % R Sun
| 30.1 R Jupiter
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Star size
Radius of the star Beta Ursae Majoris is 3.021 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: 9377 K | 1.62 T Sun
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Star temperature
Surface temperature of Beta Ursae Majoris is 9377 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: 0.5 billions years | 0.11 Sun
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Star age
Star Beta Ursae Majoris is 0.5 billion years old, which is about 0.11 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: 63.015 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): 2.4
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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Beta Ursae Majoris system structure

 Beta Ursae Majoris

More about Beta Ursae Majoris

Nearby star Beta Ursae Majoris is is approximately 3 times bigger than the Sun and temperature on its surface is around 9377 K (9104 °C), which is about 162 % of Sun's temperature.
       Beta 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
β Ursae Majoris, Beta UMa, β UMa, bet UMa, Merak, Mirak, 48 Ursae Majoris, BD+57°1302, FK5 416, GC 15145, HD 95418, HIP 53910, HR 4295, PPM 32912, SAO 2787, Gaia DR3 856096765753549056
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External sources
simbad icon
Simbad database (* bet UMa)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia DR3 856096765753549056)
Archive from the Gaia mission

Frequently Asked Questions

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

The Beta Ursae Majoris system is 84 light years or 25.9 parsecs from the Sun.

What galaxy is the Beta Ursae Majoris star in?

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

How many stars are in the Beta Ursae Majoris system?

The Beta Ursae Majoris is a single star, there are no other known stars in the system.

What type of star is the Beta Ursae Majoris?

The star Beta Ursae Majoris is a White-Blue star star.

What temperature is star Beta Ursae Majoris?

The star Beta Ursae Majoris has an effective temperature of 9377 K. Find out more about the temperature of stars in Stellar guide
Closest stars

 LP 93-438
 - 4.8 ly

37 Ursae Majoris
 - 6.3 ly

LSPM J1032+5537
 - 6.5 ly

GD 309
 - 6.7 ly

PM J10597+5124
 - 7.4 ly
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