<P> Nereid is the third - largest moon of Neptune . It has a highly eccentric orbit . It was the second moon of Neptune to be discovered, by Gerard Kuiper in 1949 . </P> <P> Nereid was discovered on 1 May 1949 by Gerard P. Kuiper on photographic plates taken with the 82 - inch telescope at the McDonald Observatory . He proposed the name in the report of his discovery . It is named after the Nereids, sea - nymphs of Greek mythology and attendants of the god Neptune . It was the second and last moon of Neptune to be discovered before the arrival of Voyager 2 (not counting a single observation of an occultation by Larissa in 1981). </P> <P> Nereid orbits Neptune in the prograde direction at an average distance of 5,513,400 km (3,425,900 mi), but its high eccentricity of 0.7507 takes it as close as 1,372,000 km (853,000 mi) and as far as 9,655,000 km (5,999,000 mi). </P> <P> The unusual orbit suggests that it may be either a captured asteroid or Kuiper belt object, or that it was an inner moon in the past and was perturbed during the capture of Neptune's largest moon Triton . </P>

What is unique about nereid’s rotation around neptune
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