Galatea

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Galatea
Galatea is the fourth closest inner satellite of Neptune. It is named after Galatea, one of the Nereids of Greek legend, whom Cyclops Polyphemus was in love with her. It is irregularly shaped and shows no sign of any geological modification. Galatea appears to be a shepherd moon for the Adams ring that is 1000 km outside its orbit. Resonances with Galatea in the ratio 42:43 are also considered the most likely mechanism for confining the unique ring arcs that exist in this ring. Galatea (moon) - Wikipedia, the free encyclopedia
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Short Description Galatea is the fourth closest inner satellite of Neptune. It is named after Galatea, one of the Nereids of Greek legend, whom Cyclops Polyphemus was in love with her. It is irregularly shaped and shows no sign of any geological modification. Galatea appears to be a shepherd moon for the Adams ring that is 1000 km outside its orbit. Resonances with Galatea in the ratio 42:43 are also considered the most likely mechanism for confining the unique ring arcs that exist in this ring. Galatea (moon) - Wikipedia, the free encyclopedia
Discovered by Stephen P. Synnott and Voyager Imaging Team
Discovery date July 1989
Type Moon
AddInfo Neptune VI
Satellite of Neptune
Orbit Prograde
Rotation Synchronous
Apoapsis 05 61 955 km
Periapsis 05 61 951 km
Semi-major axis 05 61 953 km
Distance from Sun 02 30.110 387 au /04
Eccentricity 0.000 04
Orbital period 0.428 744 31 day
Orbital speed  10.51 km/s
Inclination to the ecliptic 028.50°
Inclination to the equator 000.052
Diameter/Size 03 176 ± 8 km
Dimensions 204×184×144 km (±~10 km)
Mass 1018×2.12 kg
Density  0.75 g/cm3
Surface gravity  0.018 m/s2
Escape velocity 02 56 m/s
Rotation period 0.428 744 31 day
Axial tilt
Albedo geometric 0.08
Temperature mean 02 51 K | -222 °C
Apparent magnitude 21.9
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