Galatea (moon)

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Galatea
Galatea moon.jpg
Discovery
Discovered by Stephen P. Synnott
Discovered in July 1989
Orbital characteristics
Epoch 18 August 1989
Semi-major axis 61 953 ± 1 km
Orbital eccentricity 0.00004 ± 0.00009
Orbital period 0.42874431 ± 0.00000001 d
Inclination 0.052 ± 0.011° (to Neptune equator)

0.06° (to local Laplace plane)

Is a moon of Neptune
Physical characteristics
Dimensions 204×184×144 km (±~10 km)
Mass 2.12 ± 0.08 ×1018 kg
Mean density 0.75 ± 0.1 g/cm3
Rotation period assumed synchronous
Axial tilt ~zero presumably
Albedo (geometric) 0.08
Surface temp. ~51 K mean (estimate)
Atmosphere none
There is also an asteroid called 74 Galatea.

Galatea or Neptune VI, is the fourth closest moon to Neptune. It is named after Galatea, one of the Nereids of Greek legend.

Galatea was found in late July 1989 from the images taken by the Voyager 2 probe. It was given the designation S/1989 N 4. The discovery was said (IAUC 4824) on August 2, 1989, but the text only talks of "10 frames taken over 5 days", giving a discovery date of sometime before July 28. The name was given on 16 September 1991.

It is not a sphere and shows no sign of any geological changes.

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