Nereid

Nereid is the second-discovered moon of Neptune, found in 1949 by astronomer Gerard Kuiper. Nereid's orbit is the most eccentric of any moon in the solar system. Its distance from Neptune ranges from 841,100 miles (1,353,600 km) to 5,980,200 miles (9,623,700 km); this is so far from Neptune that Nereid requires 360 days to complete one orbit. This unusual orbit suggests that Nereid may be a captured asteroid or Kuiper Belt object, or that it was perturbed during the capture of Neptune's largest moon, Triton.

Nereid is about 210 miles (340 km) in diameter. When the Voyager 2 spacecraft visited the Neptune system in 1989, Voyager 2's best photos of Nereid were taken from about 2.9 million miles (4.7 million kilometers) - too far away for Nereid to be properly imaged. Photos show only its highly irregular shape, but no surface features. Nereid's albedo is about 14%, making it somewhat more reflective than Earth's Moon.