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Regulus B, Alpha Leonis B

Primary Facts on Regulus B

  • Regulus B's star type is main sequence dwarf star that can be located in the constellation of Leo. The description is based on the spectral class.
  • Regulus B is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (K2V) of the star, the star's colour is orange to red .
  • Alpha Leonis B is the Bayer name for the star. It was assigned this name by Johann Bayer in 1603. The closer to the start of the Greek Alphabet the name, the brighter the star is. Alpha stars tend to be the brightest in the constellation. A notable exception is Pollux (Beta Geminorum) which is the brighest star in the Gemini constellation.
  • The star can not be seen by the naked eye, you need a telescope to see it.

Regulus B's Alternative Names

(Alpha Leonis B) is the Bayer Classification for the star.

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

Location of Regulus B

The location of the 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 star 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 has a spectral type of K2V. This means the star is a orange to red main sequence dwarf 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
Colour orange to red
GalaxyMilky Way
ConstellationLeo
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

Estimated Facts


Related Stars


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