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Polaris B (Companion Star) Facts

Polaris B Facts

Polaris B's Alternative Names

(Alpha Ursae Minoris B) is the Bayer Classification for the star. The Bayer Classification was created by Johann Bayer in the early nineteenth century. The brightest star in the constellation is normally given the Alpha designation although there are exceptions such as Pollux which is Beta Geminorum.

More details on objects' alternative names can be found at Star Names .

Physical Properties (Colour, Radius) of Polaris B

Polaris B has a spectral type of F3V. This means the star is a blue to white main sequence star. Polaris B lies at a distance of 431.43 light years away from our Sun and our planet Earth or to put it another way, 132.27 parsecs away from the Sun.

Polaris B has been calculated as 1.38 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 960,204.00.km. If you need the diameter of the star, you just need to multiple the radius by 2.

Polaris B Apparent and Absolute Magnitudes

Polaris B has an apparent magnitude of 8.70 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. Magnitude, whether it be apparent/visual or absolute magnitude is measured by a number, the smaller the number, the brighter the Star is. Our own Sun is the brightest star and therefore has the lowest of all magnitudes, -26.74. A faint star will have a high number.

Distance to Polaris B

Polaris B is an estimated 431.43 light years from our Solar System (Earth and Sun). It would take a spaceship 431.43 years travelling at the speed of light to get there. We don't have a space ship that can travel that distance or at that speed yet.

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Additional Polaris B Facts and Figures

Visual Facts


Primary / Proper / Traditional NamePolaris B
Alternative NamesAlpha Ursae Minoris B
Spectral TypeF3V
Constellation's Main StarNo
Multiple Star SystemYes
Star Type main sequence Dwarf Star
ColourYellow - White
GalaxyMilky Way
ConstellationUrsa Minor
Visual / Apparent Magnitude8.70
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Declination (Dec.)+89 ° 51` 38.1
Distance from the Sun / Earth431.43 Light Years
Associated / Clustered StarsPolaris
Polaris Ab

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Calculated Facts


Radius (x the Sun)1.38

Location of Polaris B in Ursa Minor


Polaris B Location in Ursa Minor

The map was generated using Night Vision, an awesome free application by Brian Simpson.

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