Orbital
Distance

(a=AUs)
Orbital
Period

(P=years)
Orbital
Eccentricity

(e)
Orbital
Inclination

(i=degrees)

Mass

(Solar)

Diameter

(Solar)

Density

(Earths)
Surface
Gravity

(Earths)

Metallicity
(Solar)
Aab Mass Center0.0........................
Capella Aa0.3560.2850.000137.22.6912.2.........
Capella Ab0.3740.2850.000137.22.569.2.........
Habitable Zone?12.519.30137.2...............


NOTE: This animation attempts to relate the possible orbits of Capella Aa and Ab (and their current, if brief, habitable zone) to their common center of mass. To enlarge the display, the orbits have been arbitrarily rotated by 135 degrees. Although the initial display shows the system's actual orbital tilt (at an inclination of 137.2) from the visual perspective of an observer on Earth, the orbital inclination of any planet that may be discovered someday around Stars Aab would likely be different from that of the habitable zone orbit depicted here.

According to Hummel et al (1994) in the new Sixth Catalog of Visual Orbits of Binary Stars, Stars Aa and Ab are separated by less than two-thirds (0.730) of an AU (68 million miles) with a circular orbit (e= 0.000) with a period of only 104.0 days and an orbital inclination of about 137.2 from the perspective of an observer on Earth. The two bright stars have another pair of dim stellar companions C and D at a current separation of about 11,000 AUs, or 0.17 light-years.


 

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