Top: 2003 YN 107's orbit plotted from 1981 to 2026 and centered on its current quasi-stable episode, which ends in 2006. Red indicates that the object is in the evening sky, black indicates its location in the morning sky. The asteroid is orbiting the Sun, but its path is greatly perturbed when it passes close to Earth. The diagram plots its path in a coordinate system that follows Earth. Below: a close-up of the asteroid's quasi-satellite behavior. The size of the Earth is exaggerated.
Courtesy Martin Connors