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Acrux B, Alpha Crucis B

Acrux B Location in Crux

Primary Facts on Acrux B

  • Acrux B's star type is main sequence dwarf star that can be located in the constellation of Crux. The description is based on the spectral class.
  • Acrux B is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (B1V) of the star, the star's colour is blue .
  • Alpha Crucis 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 be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Acrux B's Alternative Names

(Alpha Crucis B) is the Bayer Classification for the star.

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

Location of Acrux 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 Acrux B, the location is 12h 26m 35.94 and -63 ° 05` 56.6 .

Physical Properties (Colour) of Acrux B

Acrux B has a spectral type of B1V. This means the star is a blue main sequence dwarf star. Acrux B lies at a distance of 320.71 light years away from our Sun and our planet Earth or to put it another way, 98.33 parsecs away from the Sun.

Acrux B Apparent and Absolute Magnitudes

Acrux B has an apparent magnitude of 0.77 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 Acrux B

Acrux B is an estimated 320.71 light years from our Solar System (Earth and Sun). It would take a spaceship 320.71 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 Acrux B Facts and Figures

Visual Facts


Primary / Proper / Traditional NameAcrux B
Alternative NamesAlpha Crucis B
Spectral TypeB1V
Constellation's Main StarNo
Multiple Star SystemYes
Star Type main sequence Dwarf Star
Colour blue
GalaxyMilky Way
ConstellationCrux
Visual / Apparent Magnitude0.77
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)12h 26m 35.94
Declination (Dec.)-63 ° 05` 56.6
Distance from the Sun / Earth320.71 Light Years
Associated / Clustered StarsAcrux

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Facts


Related Stars


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