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KSI Ursae Majoris B (Spectroscopic Binary Star) Facts

KSI Ursae Majoris B Facts

KSI Ursae Majoris B's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR4374. The Id of the star in the Henry Draper catalogue is HD98230.

Flamsteed designations are named after the creator, Sir John Flamsteed. Sir John numbered the stars in the constellation with a number and the latin name, this star's Flamsteed designation is 53 Ursae Majoris B with it shortened to 53 UMa B.

BD number is the number that the star was filed under in the Durchmusterung or Bonner Durchmusterung, a star catalogue that was put together by the Bonn Observatory between 1859 to 1903. The star's BD Number is BD+32 2132B.

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

Location of KSI Ursae Majoris 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 KSI Ursae Majoris B, the location is 11 18 10.8360115405 and +31 31 44.821690914 .

Radial Velocity and Proper Motion of KSI Ursae Majoris 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 -607.89 milliarcseconds/year towards the north and -339.40 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 -15.90 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 KSI Ursae Majoris B

KSI Ursae Majoris B Colour and Temperature

KSI Ursae Majoris B has a spectral type of G2V C. This means the star is a white to yellow main sequence star.

Distance to KSI Ursae Majoris B

The Parallax of the star is given as 114.49 which gives a calculated distance to KSI Ursae Majoris B of 28.49 light years from the Earth or 8.73 parsecs. It would take a spaceship travelling at the speed of light, 28.49 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

The star is roughly 1,800,679.21 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 KSI Ursae Majoris B Facts and Figures

Visual Facts


Primary / Proper / Traditional NameKSI Ursae Majoris B
Alternative NamesHD 98230, HR 4374, 53 Ursae Majoris B, 53 UMa B, BD+32 2132B
Spectral TypeG2V C
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type Main Sequence Dwarf Star
ColourWhite to Yellow
GalaxyMilky Way
ConstellationUrsa Major
Right Ascension (R.A.)11 18 10.8360115405
Declination (Dec.)+31 31 44.821690914
Distance from Earth114.49 Parallax (milliarcseconds)
 28.49 Light Years
 8.73 Parsecs
 1,800,679.21 Astronomical Units
Proper Motion Dec.-607.89 milliarcseconds/year
Proper Motion RA.-339.40 milliarcseconds/year
Radial Velocity-15.90 km/s
Associated / Clustered StarsAlula Australis
KSI Ursae Majoris A

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Sources and Links


Sourcehttp://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=Ksi%20UMa%20B

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