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Nereid(nĭr`ēəd), in astronomy, one of the eight known moons, or natural satellites, of NeptuneNeptune,
in astronomy, 8th planet from the sun at a mean distance of about 2.8 billion mi (4.5 billion km) with an orbit lying between those of Uranus and the dwarf planet Pluto; its period of revolution is about 165 years.
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Nereid(neer -ee-id) A small satellite of Neptune with a highly eccentric 360-day orbit that takes it between 1.3 and 9.6 million km from the planet. It was discovered in 1949 by G.P. Kuiper. Nereid is about 340 km in diameter, Voyager 2's best photographs of it were taken from a distance of nearly 5 million km and show that it has an albedo of about 0.14. See Table 2, backmatter.
a satellite of the planet Neptune. Nereid has a diameter of 300 km, and its mean distance from the center of the planet is 5,570,000 km. It was discovered in 1949 by the American astronomer G. P. Kuiper. Nereid is the only planetary satellite in the solar system that has an extremely elongated orbit (eccentricity 0.75). It was named after the Nereids, sea nymphs of Greek mythology.