Despina (moon)
Moon of Neptune / From Wikipedia, the free encyclopedia
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Despina /dɛˈspaɪnə/, also known as Neptune V, is the third-closest inner moon of Neptune. It is named after Greek mythological character Despoina, a nymph who was a daughter of Poseidon and Demeter.
Quick Facts Discovery, Discovered by ...
Discovery[1] | |
---|---|
Discovered by | Stephen P. Synnott and Voyager Imaging Team |
Discovery date | July 1989 |
Designations | |
Designation | Neptune V |
Pronunciation | /dəˈspaɪnə, dəˈspiːnə, dɛ-/ |
Named after | Δέσποινα Despœna |
Adjectives | Despinian |
Orbital characteristics[2][3] | |
Epoch 18 August 1989 | |
52 525.95 km | |
Eccentricity | 0.00038 ± 0.00016 |
0.33465551 ± 0.00000001 d | |
Inclination |
|
Satellite of | Neptune |
Physical characteristics | |
Dimensions | (180±6) × (148±12) × (128±6) km[4] |
Mean radius | 75±3 km[4] |
Volume | ~1.8×106 km3[lower-alpha 1] |
Mass | ~(0.71–1.4)×1018 kg[lower-alpha 2] |
Mean density | 0.4–0.8 g/cm3[5] |
~0.006–0.023 m/s2[lower-alpha 3] | |
~0.032–0.054 km/s[lower-alpha 4] | |
synchronous | |
zero | |
Albedo | 0.09[4][6] |
Temperature | ~51 K mean (estimate) |
22.0[6] | |
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