Could several cosmic bodies be in the same orbit?

Usually such bodies are found at special points in a system of two massive bodies revolving around a common center of mass – Lagrange points.
Saturn has two more satellites in orbit around Tethys: Telesto and Calypso, in orbit of Dione-1980 S6. Two groups of minor planets are orbiting Jupiter. 10 asteroids (“Greeks”) move ahead of Jupiter in its orbit and 5 asteroids (“Trojans”) – behind it.

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