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Zeta Orionis B (Companion Star) Facts

Zeta Orionis B Facts

Zeta Orionis B's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR1949. The Id of the star in the Henry Draper catalogue is HD37743.

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

Location of Zeta Orionis B

The location of the giant 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 object is compared to the celestial equator and is expressed in degrees. For Zeta Orionis B, the location is 05 40 45.571 and -01 56 35.59 .

Radial Velocity and Proper Motion of Zeta Orionis B

Proper Motion

All stars like planets orbit round a central spot, in the case of planets, its the central star such as the Sun. In the case of a star, its the galactic centre. The constellations that we see today will be different than they were 50,000 years ago or 50,000 years from now. Proper Motion details the movements of these stars and are measured in milliarcseconds. The star is moving 2.50 milliarcseconds/year towards the north and 4.00 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is 13.00 km/s . When the value is negative then the star and the Sun are getting closer to one another, likewise, a positive number means that two stars are moving away. Its nothing to fear as the stars are so far apart, they won't collide in our life-time, if ever.

Physical Properties (Colour) of Zeta Orionis B

Zeta Orionis B Colour and Temperature

Zeta Orionis B has a spectral type of O9.5II-III(n) C. This means the star is a blue giant star.

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Additional Zeta Orionis B Facts and Figures

Visual Facts


Primary / Proper / Traditional NameZeta Orionis B
Alternative NamesHD 37743, HR 1949
Spectral TypeO9.5II-III(n) C
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeGiant Star
ColourBlue
GalaxyMilky Way
ConstellationOrion
Right Ascension (R.A.)05 40 45.571
Declination (Dec.)-01 56 35.59
Proper Motion Dec.2.50 milliarcseconds/year
Proper Motion RA.4.00 milliarcseconds/year
Radial Velocity13.00 km/s
Associated / Clustered StarsAlnitak
Zeta Orionis A

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Sources and Links


Sourcehttp://simbad.u-strasbg.fr/simbad/sim-id?Ident=hd%2037743

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