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.
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.
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 Stellar Age, Metallicity or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.
|Traditional Name||Capella Ab|
|Bayer Designation||Alpha Aurigae Ab|
|Star Type||giant star|
|Right Ascension (R.A.)||05h 16m 41.30|
|Distance from the Sun / Earth||0.00 Light Years|
|Colour||(G) White to Yellow|
|Radius (x the Sun)||8.80|