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Regulus B (Companion Star) Facts

Regulus B Facts

Regulus B's Alternative Names

(Alpha Leonis B) is the Bayer Classification for the star. The Bayer Classification was created by Johann Bayer in 1603. The brightest star in the constellation is normally given the Alpha designation, there are exceptions such as Pollux which is Beta Geminorum.

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

Location of Regulus 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 Regulus B, the location is 10 h 08m 12.8 and +11 ° 59` 48 .

Physical Properties (Colour) of Regulus B

Regulus B Colour and Temperature

Regulus B has a spectral type of K2V. This means the star is a orange to red main sequence star. Regulus B lies at a distance of 77.49 light years away from our Sun and our planet Earth or to put it another way, 23.76 parsecs away from the Sun.

Regulus B Apparent and Absolute Magnitudes

Regulus B has an apparent magnitude of 8.13 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 Regulus B

Regulus B is an estimated 77.49 light years from our Solar System (Earth and Sun). It would take a spaceship 77.49 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 Regulus B Facts and Figures

Visual Facts

Primary / Proper / Traditional NameRegulus B
Alternative NamesAlpha Leonis B
Spectral TypeK2V
Constellation's Main StarNo
Multiple Star SystemYes
Star Type Main Sequence Dwarf Star
ColourOrange to Red
GalaxyMilky Way
Visual / Apparent Magnitude8.13
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)10 h 08m 12.8
Declination (Dec.)+11 ° 59` 48
Distance from the Sun / Earth77.49 Light Years
Associated / Clustered StarsRegulus
Regulus C

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Related Stars

Comments and Questions

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