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Alkaid
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Star Alkaid

Blue-white star Alkaid is located 104 light years away from the Sun. It is a single star of spectral class B3 V, that has 610 % of solar mass. For now, there are no known exoplanets in this star system.
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Sun distance
104 light years
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Alkaid

Blue-white star, High proper motion star
Spectral class: B3 V

Location +

Ascension iconRight ascension: 13h 47m 32.438s
Declination iconDeclination: 49° 18' 47.760'' (northern hemisphere)
Parallax iconParallax: 31.380
Distance iconSun distance: 103.900 ly | 31.9 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: 610 % M Sun
| 6390 M Jupiter
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Star mass
Mass of the star Alkaid is 6.1 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: 340 % R Sun
| 33.8 R Jupiter
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Star size
Radius of the star Alkaid is 3.4 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: 15540 K | 2.69 T Sun
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Star temperature
Surface temperature of Alkaid is 15540 K, which is 269 % 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: 0.1 billions years | 0.02 Sun
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Star age
Star Alkaid is 0.1 billion years old, which is about 0.02 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: 594 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): 1.9
Magnitude iconAbsolute magnitude (V): -0.7
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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Alkaid system structure

 Alkaid

More about Alkaid

Star Alkaid is a main sequence star that fuses hydrogen atoms into helium. It is is approximately 3 times bigger than the Sun and temperature on its surface is around 15540 K (15267 °C), which is about 269 % of Sun's temperature.
       Alkaid 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
Eta Ursae Majoris, Benetnash, Benetnasch, Elkeid, η UMa, 85 UMa, BD+50°2027, FK5 509, GC 18643, HD 120315, HIC 67301, HIP 67301, HR 5191, PPM 53742, SAO 44752
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External sources
simbad icon
Simbad database (* eta UMa)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)

Frequently Asked Questions

How far is the Alkaid system from the Sun?

The Alkaid system is 104 light years or 31.9 parsecs from the Sun.

What galaxy is the Alkaid star in?

The Alkaid is in the Milky Way galaxy just like the Sun.

How many stars are in the Alkaid system?

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

What type of star is the Alkaid?

The star Alkaid is a Blue-white star star.

What temperature is star Alkaid?

The star Alkaid has an effective temperature of 15540 K. Find out more about the temperature of stars in Stellar guide
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