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Nereid, or Neptune II, is the third-largest moon of Neptune. ... Nereid is similar in size to Saturn's moon Mimas, though Nereid is denser. Since 1987 some ...
The known densities of TNOs in this size range are remarkably low (1–1.2 g/cm 3), ... Nereid Neptune II: 170 ...
Triton was discovered by William Lassell in 1846, just seventeen days after the discovery of Neptune. [3] Nereid was discovered by Gerard P. Kuiper in 1949. [4] The third moon, later named Larissa, was first observed by Harold J. Reitsema, William B. Hubbard, Larry A. Lebofsky and David J. Tholen on 24 May 1981.
On the other hand, Neptune's Triton, which is probably a captured object, is usually listed as irregular despite being within 0.05 of the radius of Neptune's Hill sphere, so that Triton's precession is primarily controlled by Neptune's oblateness instead of by the Sun. [5] Neptune's Nereid and Saturn's Iapetus have semi-major axes close to 0.05 ...
Size comparison between Proteus (lower left), the Moon (upper left) and Earth. Proteus is the second-largest moon of Neptune and is the largest of its regular prograde moons. It is about 420 km (260 mi) in diameter, larger than Nereid, Neptune's third-largest moon.
Neptune's second-known satellite (by order of discovery), the irregular moon Nereid, has one of the most eccentric orbits of any satellite in the Solar System. The eccentricity of 0.7512 gives it an apoapsis that is seven times its periapsis distance from Neptune. [j]
He obtained a value of 3,800 km. Subsequent measurement attempts arrived at values ranging from 2,500 to 6,000 km, or from slightly smaller than the Moon (3,474.2 km) to nearly half the diameter of Earth. [80] Data from the approach of Voyager 2 to Neptune on August 25, 1989, led to a more accurate estimate of Triton's diameter (2,706 km). [81]
It was named after Eucrate, a Nereid in Greek mythology. In 2001, the asteroid was detected by radar from the Arecibo Observatory at a distance of 1.18 AU. The resulting data yielded an effective diameter of 134 ± 15 km. [3] An Occult (Software) plot of 5 Occultation chords (and a miss) with DAMIT Inversion model at event time.