Nereid (moon)
Moon of Neptune / From Wikipedia, the free encyclopedia
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Nereid, or Neptune II, is the third-largest moon of Neptune. It has the most eccentric orbit of all known moons in the Solar System.[4] It was the second moon of Neptune to be discovered, by Gerard Kuiper in 1949.
Quick Facts Discovery, Discovered by ...
Discovery[1] | |
---|---|
Discovered by | Gerard P. Kuiper |
Discovery date | 1 May 1949 |
Designations | |
Designation | Neptune II |
Pronunciation | /ˈnɪəriəd/ NEER-ee-əd[2] |
Named after | Νηρηΐδες Nērēḯdes |
Adjectives | Nereidian or Nereidean (both /ˌnɛriˈɪdiən/ NERR-ee-ID-ee-ən)[3] |
Orbital characteristics[4] | |
Epoch 1 January 2020 (JD 2458849.5) | |
Observation arc | 27,396 d (75.01 yr) |
5,504,000 km (0.03679 AU) | |
Eccentricity | 0.749 |
360.14 d (0.9860 yr) | |
318.0° | |
0° 59m 58.597s / day | |
Inclination | 5.8° (to the ecliptic) 7.090° (to local Laplace plane)[4] |
326.0° | |
290.3° | |
Satellite of | Neptune |
Physical characteristics | |
Mean diameter | 357±13 km[5] |
Flattening | ≤0.23[lower-alpha 1] |
Mass | 3.57×1019 kg (5.98×10−6 M🜨) |
Mean density | 1.5 g/cm3 (assumed)[6] |
≈0.075 m/s2 (0.0076 g) | |
11.594±0.017 h[5] | |
Albedo | 0.24[5] |
Temperature | ≈50 K (mean estimate) |
19.2[citation needed] | |
4.4[7] | |
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