Co-orbital configuration

[2] An exchange orbit occurs when two co-orbital objects are of similar masses and thus exert a non-negligible influence on each other.

The best known examples are the large population of asteroids that orbit ahead of or behind Jupiter around the Sun.

[4] In April 2023, a group of amateur astronomers reported two new exoplanet candidates co-orbiting, in a horseshoe exchange orbit, close to the star GJ 3470 (this star has a confirmed planet GJ 3470 b).

However, the mentioned study is only in preprint form on arXiv, and it has not yet been peer reviewed and published in a reputable scientific journal.

[5][6] Unrelated to the aforementioned claim, a strong candidate of Trojan planet in the GJ 3470 system was found by the TROY project and published in Astronomy & Astrophysics, based on the radial velocity data.

[7] In July 2023, the possible detection of a cloud of debris co-orbital with the proto-planet PDS 70 b was announced.

This debris cloud could be evidence of a Trojan planetary-mass body or one in the process of forming.

[10] The reason why no trojan planets have been definitively detected could be that tides destabilize their orbits.

[11] According to the giant impact hypothesis, the Moon formed after a collision between two co-orbital objects: Theia, thought to have had about 10% of the mass of Earth (about as massive as Mars), and the proto-Earth.

Their orbits were perturbed by other planets, bringing Theia out of its trojan position and causing the collision.

[2] The Saturnian moons Janus and Epimetheus share their orbits, the difference in semi-major axes being less than either's mean diameter.

These include 54509 YORP, (85770) 1998 UP1, 2002 AA29, (419624) 2010 SO16, 2009 BD, and 2015 SO2 which exist in resonant orbits similar to Cruithne's.

Hungaria asteroids were found to be one of the possible sources for co-orbital objects of the Earth with a lifetime up to ~58 kyrs.

[2] From a co-rotating perspective the quasi-satellite appears to orbit the primary like a retrograde satellite, although at distances so large that it is not gravitationally bound to it.