Universe Guide

Zeta2 Coronae Borealis B (Companion Star) Facts

Zeta2 Coronae Borealis B Facts

Zeta2 Coronae Borealis B's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR5833. The Id of the star in the Henry Draper catalogue is HD139891.

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

Location of Zeta2 Coronae Borealis B

The location of the main sequence 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 Zeta2 Coronae Borealis B, the location is 15h 39m 22.2443739143 and +36° 38` 12.586657172 .

Radial Velocity and Proper Motion of Zeta2 Coronae Borealis 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 -3.87 milliarcseconds/year towards the north and -14.20 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 -19.40 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 Zeta2 Coronae Borealis B

Zeta2 Coronae Borealis B Colour and Temperature

Zeta2 Coronae Borealis B has a spectral type of B9V C. This means the star is a blue main sequence star.

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Additional Zeta2 Coronae Borealis B Facts and Figures

Visual Facts

Primary / Proper / Traditional NameZeta2 Coronae Borealis B
Alternative NamesHD 139891, HR 5833
Spectral TypeB9V C
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type Main Sequence Dwarf Star
GalaxyMilky Way
Right Ascension (R.A.)15h 39m 22.2443739143
Declination (Dec.)+36° 38` 12.586657172
Proper Motion Dec.-3.87 milliarcseconds/year
Proper Motion RA.-14.20 milliarcseconds/year
Radial Velocity-19.40 km/s
Associated / Clustered StarsZeta2 Coronae Borealis

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Related Stars

Comments and Questions

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