Trojan moon

Trojan moon

A trojan moon is a natural satellite of a planet occupying the L4 or L5 equilateral Lagrangian points of a primary-moon system. They are named by analogy with the Trojan asteroids, which occupy the L4 and L5 points of the Sun-Jupiter system.

Four examples are known, all in the Saturnian system: Telesto and Calypso bracket Tethys, whilst Helene and Polydeuces bracket Dione. The Earth-Moon points have been repeatedly searched for Trojans, but nothing other than a possible slight overabundance of dust (see Kordylewski clouds) has ever been found.

ee also

* Trojan asteroid
* Trojan planet
* Trojan (astronomy)
* Co-orbital moon
* Lagrangian point
* List of objects at Lagrangian points


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