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Thuban
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Star Thuban

Binary star Thuban is located 303 light years away from the Sun. It consists of a blue giant and a white-blue star. For now, there are no known exoplanets in this star system.
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Sun distance
303 light years
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Thuban A

Blue Giant
Spectral class: A0III

Location +

Ascension iconRight ascension: 14h 4m 23.350s
Declination iconDeclination: 64° 22' 33.062'' (northern hemisphere)
Parallax iconParallax: 10.760
Distance iconSun distance: 303.119 ly | 92.9 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: 280 % M Sun
| 2933 M Jupiter
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Star mass
Mass of the star Thuban A is 2.8 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 Thuban A 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: 10100 K | 1.75 T Sun
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Star temperature
Surface temperature of Thuban A is 10100 K, which is 175 % 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: 479 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

Thuban B

White-Blue star

Location +

Distance iconDistance from the primary: 0.46 AU

Basic characteristic

icon weight
Mass: 260 % M Sun
| 2724 M Jupiter
+
Star mass
Mass of the star Thuban B is 2.8 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: 250 % R Sun
| 25.2 R Jupiter
(estimate)
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Star size
Radius of the star Thuban B is not known. Its estimated value based on other similar stars is about 250 % 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: 8700 K
 (estimate)
+
Star temperature
Surface temperature of Thuban B is estimated to be 8719 K, which is 151 % 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: 40 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
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Thuban system structure

 Thuban A
Thuban B 0.46 AU

More about Thuban

       Thuban can be found in northern celestial hemisphere.
Other designations of this star
Alpha Dra, α Dra, 11 Dra, AG+64° 666, BD+65° 978, FK5 521, GC 19019, HD 123299, HIP 68756, HR 5291, SAO 16273, PPM 18861, PLX 3209, TYC 4174-1262-1, GSC 04174-01262, IRAS 14030+6436, 2MASS J14042335+6422331
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Frequently Asked Questions

How far is the Thuban system from the Sun?

The Thuban system is 303 light years or 92.9 parsecs from the Sun.

What galaxy is the Thuban star in?

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

How many stars are in the Thuban system?

The Thuban system contains 2 stars.

What type of star is the Thuban?

The primary in the Thuban system is a Blue Giant star.

What temperature is star Thuban?

The primary in the Thuban system has a temperature of 10100 K. Find out more about the temperature of stars in Stellar guide
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