It is called an elliptical orbit.
elliptical
Most things orbit in an elliptical pattern. There is a technical definition of an ellipse but between you and me it is an oval.
an oval
Oval
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Yes, comets orbit the sun, but usually in an eliptical (oval) or eccentric orbit rather than a more-or-less circular one like the planets.
An elliptical orbit is a flattened circle or oval-like shape followed by a planet as it travels around the sun. It is a common shape observed in celestial bodies' paths due to the gravitational pull between them.
oval
oval range
The Oval Office. It is oval because George Washington liked oval like shapes.
Pluto has such an unusual orbit, because it goes in a flat oval.
an oval