Galatea (moon)
Moon of Neptune / From Wikipedia, the free encyclopedia
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For the asteroid, see 74 Galatea.
Galatea /ɡæləˈtiːə/, also known as Neptune VI, is the fourth-closest inner moon of Neptune. It is named after Galatea, one of the fifty Nereids of Greek legend, with whom Cyclops Polyphemus was vainly in love.
Quick Facts Discovery, Discovered by ...
Discovery | |
---|---|
Discovered by | Stephen P. Synnott[1] and Voyager Imaging Team |
Discovery date | July 1989 |
Designations | |
Designation | Neptune VI |
Pronunciation | /ɡæləˈtiːə/[2] |
Named after | Γαλάτεια Galateia |
Adjectives | Galatean[3] |
Orbital characteristics[4][5] | |
Epoch 18 August 1989 | |
61952.57 km | |
Eccentricity | 0.00022 ± 0.00008 |
0.42874431 ± 0.00000001 d | |
Inclination |
|
Satellite of | Neptune |
Group | ring shepherd |
Physical characteristics | |
Dimensions | (204±10) × (184±16) × (144±8) km[6] |
Mean radius | 88±4 km[6] |
Volume | ~2.8×106 km3[lower-alpha 1] |
Mass | 1.94×1018 kg[8] |
Mean density | ~0.69 g/cm3[lower-alpha 2] |
~0.012–0.025 m/s2[lower-alpha 3] | |
~0.05–0.06 km/s[lower-alpha 4] | |
synchronous | |
zero | |
Albedo | 0.08[6][9] |
Temperature | ~51 K mean (estimate) |
21.9[9] | |
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