- Additional Information
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Additional Information
Short Description Nereid is the third-largest moon of Neptune. It has a highly eccentric orbit. It is named after the Nereids, sea-nymphs of Greek mythology and attendants of the god Neptune. 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. Nereid (moon) - Wikipedia, the free encyclopedia Discovered by Gerard Peter Kuiper Discovery date 1 May 1949 Type Moon AddInfo Neptune II Satellite of Neptune Orbit Prograde Rotation Direct Apoapsis 07 9 655 000 km Periapsis 07 1 372 000 km Semi-major axis 07 5 513 787 km Distance from Sun 02 30.110 387 au /09 Eccentricity 0.750 7 Orbital period 360.1362 days Orbital speed 0.934 km/s Inclination to the ecliptic 005.07° Inclination to the equator 032.55° Diameter/Size 03 340 ± 50 km Mass 1019×3.1 kg Density 01 1.5 g/cm3 Surface gravity 0.07 m/s2 Escape velocity 160 m/s Rotation period 0.48 day | 11 hour 31 min Equatorial rotation velocity 01 m/s Albedo geometric 0.155 Temperature mean 02 50 K | -223 °C Apparent magnitude 19.7 - Comments
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