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English

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.

Chinese

最外层的5颗卫星与其他气体巨行星 的不规则卫星类似,并且很可能是由海王星的引力捕获,相比之下,规则行星大多是原生的[6 ] 。 海卫一和海卫二是两颗不同寻常的不规则卫星,另外5颗则与其它外行星的外层不规则卫星类似[6 ] 。 首先,海卫一和海卫二是太阳系中已经发现的最大两颗不规则卫星,其中海卫一甚至比其他所有已知的不规则卫星要大上一个数量级 ;其次,两卫星的半长轴都异常之小,其中海卫一的半长轴比其他所有已知的不规则卫星都要小一个数量级;第三,两卫星的轨道离心率都很不寻常:海卫二的轨道离心率在所有已知不规则卫星中处于最高之列,而海卫一的轨道却近乎是正圆形;最后,海卫二的轨道倾角也是所有已知不规则卫星中最小的[6 ] 。