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Polaris B, Alpha Ursae Minoris B

Polaris B (Alpha Ursae Minoris B) Location in Ursa Minor

Polaris B (Alpha Ursae Minoris B) is a blue to white main sequence dwarf star that can be located in the constellation of Ursa Minor. The description is based on the spectral class. The star can not be seen by the naked eye, you need a telescope to see it.

Polaris B's Alternative Names

(Alpha Ursae Minoris B) is the Bayer Classification for the star.

More details on star 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 dwarf 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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Polaris B Facts

Visual Facts


Primary / Proper / Traditional NamePolaris B
Alternative NamesAlpha Ursae Minoris B
Spectral TypeF3V
Multiple Star SystemYes
Star Type main sequence Dwarf Star
Colour blue to 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 Facts


Radius (x the Sun)1.38

Related Stars


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