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Capella Ab, Alpha Aurigae Ab

Primary Facts on Capella Ab

  • Capella Ab's star type is giant star that can be located in the constellation of Auriga. The description is based on the spectral class.
  • Capella Ab is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (G1III) of the star, the star's colour is white to yellow .
  • Alpha Aurigae Ab 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 be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Capella Ab's Alternative Names

(Alpha Aurigae Ab) is the Bayer Classification for the star.

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

Physical Properties (Colour, Radius) of Capella Ab

Capella Ab has a spectral type of G1III. This means the star is a white to yellow giant star.

Capella Ab has been calculated as 8.80 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 6,123,040.00.km. If you need the diameter of the star, you just need to multiple the radius by 2.

Capella Ab Apparent and Absolute Magnitudes

Capella Ab has an apparent magnitude of 0.08 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.

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Additional Capella Ab Facts and Figures

Visual Facts


Primary / Proper / Traditional NameCapella Ab
Alternative NamesAlpha Aurigae Ab
Spectral TypeG1III
Constellation's Main StarNo
Multiple Star SystemYes
Star TypeGiant Star
Colour white to yellow
GalaxyMilky Way
ConstellationAuriga
Visual / Apparent Magnitude0.08
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)05h 16m 41.30
Associated / Clustered StarsCapella

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Facts


Radius (x the Sun)8.80

Related Stars


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