Universe Guide


Capella Ab, Alpha Aurigae Ab

Capella Ab (Alpha Aurigae Ab) is a white to yellow giant star that can be located in the constellation of Auriga. Capella Ab is the brightest star in Auriga based on the Hipparcos 2007 apparent magnitude. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Alpha Aurigae Ab is the Bayer Classification for the star.

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.

The star has a companion star which is in orbit close by, it has at least the following companions in close orbit, .

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.

Source of Information

The source of the information if it has a Hip I.D. is from Simbad, the Hipparcos data library based at the University at Strasbourg, France. Hipparcos was a E.S.A. satellite operation launched in 1989 for four years. The items in red are values that I've calculated so they could well be wrong. Information regarding Metallicity and/or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

Capella Ab Facts

Alternative Names

Traditional/Proper NameCapella Ab
Bayer DesignationAlpha Aurigae Ab

Visual Facts

Star Typegiant star
Visual / Apparent Magnitude0.08
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)05h 16m 41.30
Spectral TypeG1III
Colour(G) White to Yellow

Estimated Facts

Radius (x the Sun)8.80

Related Stars

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