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Polaris Aa
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Star Polaris Aa

Triple star system Polaris Aa is located 433 light years away from the Sun. It is a system with 3 stars. For now, there are no known exoplanets in this star system.
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Sun distance
433 light years
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Polaris Aa

Yellow supergiant
Spectral class: F7Ib

Location +

Ascension iconRight ascension: 2h 31m 49.090s
Declination iconDeclination: 89° 15' 50.800'' (northern hemisphere)
Parallax iconParallax: 7.540
Distance iconSun distance: 432.568 ly | 132.6 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: 540 % M Sun
| 5657 M Jupiter
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Star mass
Mass of the star Polaris Aa is 5.4 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: 3750 % R Sun
| 373.2 R Jupiter
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Star size
Radius of the star Polaris Aa is 37.5 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: 6015 K | 1.04 T Sun
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Star temperature
Surface temperature of Polaris Aa is 6015 K, which is 104 % 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: 0.07 billions years | 0.02 Sun
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Star age
Star Polaris Aa is 0.07 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: 1,260 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

Polaris Ab

Yellow-White star
Spectral class: F6V

Basic characteristic

icon weight
Mass: 126 % M Sun
| 1320 M Jupiter
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Star mass
Mass of the star Polaris Ab is 5.4 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: 104 % R Sun
| 10.3 R Jupiter
+
Star size
Radius of the star Polaris Ab is 1.04 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: 6300 K
 (estimate)
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Star temperature
Surface temperature of Polaris Ab is estimated to be 6339 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: 0.07 billions years | 0.02 Sun
+
Star age
Star Polaris Ab is 0.07 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: 3 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

Polaris B

Yellow-White star
Spectral class: F3V

Basic characteristic

icon weight
Mass: 139 % M Sun
| 1456 M Jupiter
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Star mass
Mass of the star Polaris B is 1.26 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: 138 % R Sun
| 13.7 R Jupiter
+
Star size
Radius of the star Polaris B is 1.38 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: 6900 K | 1.19 T Sun
+
Star temperature
Surface temperature of Polaris B is 6900 K, which is 119 % 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: 3.9 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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Polaris Aa system structure

 Polaris Aa
Polaris Ab
Polaris B

More about Polaris Aa

       Polaris Aa can be found in northern celestial hemisphere.
Other designations of this star
Polaris, North Star, Cynosura, Alruccabah, Phoenice, Navigatoria, Star of Arcady, Yilduz, Mismar, Alpha UMi, α UMi, 1 Ursae Minoris, BD+88° 8, FK5 907, GC 2243, HD 8890, HIP 11767, HR 424, SAO 308, ADS 1477, CCDM J02319+8915, Polárka
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Frequently Asked Questions

How far is the Polaris Aa system from the Sun?

The Polaris Aa system is 433 light years or 132.6 parsecs from the Sun.

What galaxy is the Polaris Aa star in?

The Polaris Aa is in the Milky Way galaxy just like the Sun.

How many stars are in the Polaris Aa system?

The Polaris Aa system contains 3 stars.

What type of star is the Polaris Aa?

The primary in the Polaris Aa system is a Yellow supergiant star.

What temperature is star Polaris Aa?

The primary in the Polaris Aa system has a temperature of 6015 K. Find out more about the temperature of stars in Stellar guide
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