Nereid

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Nereid
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
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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
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