The X axis is labeled in Gm and the fraction of the Hill sphere 's radius. In order of their distance from the planet, the irregular moons are Triton , Nereid , Halimede , Sao , Laomedeia , Psamathe , and Neso , a group that includes both prograde and retrograde objects.[12] The five outermost moons are similar to the irregular moons of other giant planets , and are thought to have been gravitationally captured by Neptune, unlike the regular satellites, which probably formed in situ .[7] Triton and Nereid are unusual irregular satellites and are thus treated separately from the other five irregular Neptunian moons, which are more like the outer irregular satellites of the other outer planets.[7] Firstly, they are the largest two known irregular moons in the Solar System, with Triton being almost an order of magnitude larger than all other known irregular moons.
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