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Sirius B, Alpha Canis Majoris B

Sirius B Location in Canis Major

Primary Facts on Sirius B

  • Sirius B's star type is dwarf star that can be located in the constellation of Canis Major. The description is based on the spectral class.
  • Sirius B is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (DA2) of the star, the star's colour is white.
  • Alpha Canis Majoris B is the Bayer name for the star. It was assigned this name by Johann Bayer in 1603. The closer to the start of the Greek Alphabet the name, the brighter the star is. Alpha stars tend to be the brightest in the constellation. A notable exception is Pollux (Beta Geminorum) which is the brighest star in the Gemini constellation.
  • The star can not be seen by the naked eye, you need a telescope to see it.

Sirius B's Alternative Names

(Alpha Canis Majoris B) is the Bayer Classification for the star.

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

Location of Sirius B

The location of the star in the night sky is determined by the Right Ascension (R.A.) and Declination (Dec.), these are equivalent to the Longitude and Latitude on the Earth. The Right Ascension is how far expressed in time (hh:mm:ss) the star is along the celestial equator. If the R.A. is positive then its eastwards. The Declination is how far north or south the star is compared to the celestial equator and is expressed in degrees. For Sirius B, the location is 06h 45m 09.0 and -16 ° 43` 06 .

Physical Properties (Colour) of Sirius B

Sirius B has a spectral type of DA2. This means the star is a white dwarf star. Sirius B lies at a distance of 8.60 light years away from our Sun and our planet Earth or to put it another way, 2.64 parsecs away from the Sun.

Sirius B Apparent and Absolute Magnitudes

Sirius B has an apparent magnitude of 8.44 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 Sirius B

Sirius B is an estimated 8.60 light years from our Solar System (Earth and Sun). It would take a spaceship 8.60 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 Sirius B Facts and Figures

Visual Facts


Primary / Proper / Traditional NameSirius B
Alternative NamesAlpha Canis Majoris B
Spectral TypeDA2
Constellation's Main StarNo
Multiple Star SystemYes
Star TypeDwarf Star
Colour white
GalaxyMilky Way
ConstellationCanis Major
Visual / Apparent Magnitude8.44
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)06h 45m 09.0
Declination (Dec.)-16 ° 43` 06
Distance from the Sun / Earth8.60 Light Years
Associated / Clustered StarsSirius

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Facts


Related Stars


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