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Delta Ursae Majoris
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Star Delta Ursae Majoris

White-Blue star Delta Ursae Majoris is located 81 light years away from the Sun. It is a single star of spectral class A2Vn, that has 163 % of solar mass. For now, there are no known exoplanets in this star system.
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Sun distance
81 light years
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Delta Ursae Majoris

White-Blue star, High proper motion star
Spectral class: A2Vn

Location +

Ascension iconRight ascension: 12h 15m 25.768s
Declination iconDeclination: 57° 1' 57.551'' (northern hemisphere)
Parallax iconParallax: 40.328
Distance iconSun distance: 80.876 ly | 24.8 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: 163 % M Sun
| 1708 M Jupiter
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Star mass
Mass of the star Delta Ursae Majoris is 1.63 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: 140 % R Sun
| 13.9 R Jupiter
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Star size
Radius of the star Delta Ursae Majoris is 1.4 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: 9480 K | 1.64 T Sun
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Star temperature
Surface temperature of Delta Ursae Majoris is 9480 K, which is 164 % 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 Delta Ursae Majoris 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: 14 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): 3.3
Magnitude iconAbsolute magnitude (V): 1.3
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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Delta Ursae Majoris system structure

 Delta Ursae Majoris

More about Delta Ursae Majoris

Nearby star Delta Ursae Majoris is a main sequence star that fuses hydrogen atoms into helium. It is is approximately 40 % bigger than the Sun and temperature on its surface is around 9480 K (9207 °C), which is about 164 % of Sun's temperature.
       Delta 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
del UMa, Megrez, δ Ursae Majoris, Delta UMa, Delta UMa, 69 Ursae Majoris, BD+57 1363, CCDM J12155+5702A, FK5 456, GC 16736, HD 106591, HIP 59774, HR 4660, IDS 12105+5735 A, PPM 33469, SAO 28315, WDS J12154+5702A, Gaia EDR3 1575287046603605888
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External sources
simbad icon
Simbad database (* del UMa)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 1575287046603605888)
Archive from the Gaia mission

Frequently Asked Questions

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

The Delta Ursae Majoris system is 81 light years or 24.8 parsecs from the Sun.

What galaxy is the Delta Ursae Majoris star in?

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

How many stars are in the Delta Ursae Majoris system?

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

What type of star is the Delta Ursae Majoris?

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

What temperature is star Delta Ursae Majoris?

The star Delta Ursae Majoris has an effective temperature of 9480 K. Find out more about the temperature of stars in Stellar guide
Closest stars

 2MASS J12161235+5709275
 - 5.3 ly

UCAC4 736-053991
 - 5.3 ly

NO Ursae Majoris
 - 5.3 ly

LP 130-226
 - 5.7 ly

G 199-17
 - 5.7 ly
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