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Polaris B (Alpha Ursae Minoris B)

Polaris B (Alpha Ursae Minoris B) is a blue to white main sequence dwarf star that can be located in the constellation of UrsaMinor. Alpha Ursae Minoris B is the Bayer Classification for the star.

Polaris B Luminosity

Luminosity is the amount of energy that a star pumps out and its relative to the amount that our star, the Sun gives out. The figure of 3.0000000 that I have given is based on the Spectral Types page that I have found on the Internet. You might find a different figure, one that may have been calculated rather than generalised that I have done. The figure is always the amount times the luminosity of the Sun. It is an imprecise figure because of a number of factors including but not limited to whether the star is a variable star and distance.

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.

The star has companion stars which are in orbit close by, it has at least the following companions in close orbit, Polaris, Polaris Ab.

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.

Source of Information

The source of the information if it has a Hip I.D. is from Simbad, the Hipparcos data library based at the University at Strasbourg, France. Hipparcos was a E.S.A. satellite operation launched in 1989 for four years. The items in red are values that I've calculated so they could well be wrong. Information regarding Stellar Age, Metallicity or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

Polaris B Facts

Alternative Names

Traditional NamePolaris B
Bayer DesignationAlpha Ursae Minoris B

Visual Facts

Star Typemain sequence dwarf star
Apparent Magnitude8.70
Declination (Dec.)+89 d 51 ` 38.1
Distance from the Sun / Earth431.43 Light Years
Spectral TypeF3V
Colour(F) blue to white

Companions (Multi-Star and Exoplanets) Facts

Companion StarsPolaris
Polaris Ab

Estimated Facts

Radius (x the Sun)1.38
Luminosity (x the Sun)3.0000000

Related Stars

Location of Polaris B in Ursa Minor


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

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


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