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Mizar B (Companion Star) Facts

Mizar B Facts

Mizar B's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR5055. The Id of the star in the Henry Draper catalogue is HD116657.

Mizar B has alternative name(s) :- Zeta 02 Uma, 79 UMa B.

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

Location of Mizar B

The location of the subgiant 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 Mizar B, the location is 13 23 56.3230195273 and +54 55 18.506044965 .

Radial Velocity and Proper Motion of Mizar B

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 -26.45 miliarcseconds/year towards the north and 114.01 miliarcseconds/year east if we saw them in the horizon.

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is -9.30 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 of Mizar B

Mizar B has a spectral type of kA1h(eA)mA7IV-V C.

Distance to Mizar B

The Parallax of the star is given as 40.50 which gives a calculated distance to Mizar B of 80.53 light years from the Earth or 24.69 parsecs. It would take a spaceship travelling at the speed of light, 80.53 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

The star is roughly 5,092,642.58 Astronomical Units from the Earth/Sun give or take a few. An Astronomical Unit is the distance between Earth and the Sun. The number of A.U. is the number of times that the star is from the Earth compared to the Sun.

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Additional Mizar B Facts and Figures

Visual Facts


Primary / Proper / Traditional NameMizar B
Alternative NamesZeta 02 Uma, 79 UMa B, HD 116657, HR 5055
Spectral Type kA1h(eA)mA7IV-V C
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeSubgiant Star
GalaxyMilky Way
ConstellationUrsa Major
Right Ascension (R.A.)13 23 56.3230195273
Declination (Dec.)+54 55 18.506044965
Distance from Earth40.50 Parallax (milliarcseconds)
 80.53 Light Years
 24.69 Parsecs
 5,092,642.58 Astronomical Units
Proper Motion Dec.-26.45 milliarcseconds/year
Proper Motion RA.114.01 milliarcseconds/year
Radial Velocity-9.30 km/s
Associated / Clustered StarsMizar

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Sources and Links


Sourcehttp://simbad.u-strasbg.fr/simbad/sim-id?Ident=hd%20116657

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