Capella

Capella is the sixth brightest star in the night sky, a quadruple star system of two binary-star pairs, the four termed Capella Aa, Capella Ab, Capella H, and Capella L. The former two are both giant stars, about as distant from each other as the Sun and Venus, but without a telescope they appear as a single star. The latter two are M dwarfs and invisible without a telescope. Capella is a strong X-ray source, the X-rays thought to stem from stellar activity affecting Capella Aa's corona. Characteristics of Capella A:

• Auriga - constellation.
• 05h16m41.35871s - right ascension
• +45deg59m52.7693s - declination.
• 42.9 ly - distance.
• +0.08 - apparent magnitude.
• G3III - spectral type (both together).
• 2.6 and 2.5 - masses(solar).
• 79 and 73 - luminosities(solar).
• 12 and 9 - radii(solar).
• +0.80 - B-V color index.