How tilted is Triton’s orbit compared with Neptune’s equator?

The orbit of Triton, the largest moon of Neptune, is tilted more than 157° to the planet's equator. Specifically, its orbital inclination is 157.3°.1

This high degree of inclination, combined with the fact that Triton moves in a retrograde orbit—meaning it revolves in the direction opposite to Neptune’s rotation—is highly unusual for a large moon. These orbital characteristics suggest that Triton was not formed in its current position but was instead a captured object that originated elsewhere in the solar system.12