For example, a mildly eccentric orbit would keep Earth in its so - called habitable zone all year long so that there is little significant change in climate.
According to the Sixth Catalog of Orbits of Visual Binaries, Stars A and B move around each other at an average distance of 250 AUs (semi-major axis a = 22.289») in a mildlyeccentric (e = 0.13) orbit that takes 2,720 years to complete.
The orbit of object «b» around 79 Ceti is only mildlyeccentric, but may still be more elliptical than that of any planet in the Solar System other than Pluto.