Galatea (moon)

Galatea
	Galatea as seen by Voyager 2 (elongation is due to smearing)
Discovery
Discovered by	Stephen P. Synnott and Voyager Imaging Team
Discovery date	July 1989
Designations
Designation	Neptune VI
Pronunciation	/ɡæləˈtiːə/
Named after	Γαλάτεια Galateia
Adjectives	Galatean
Orbital characteristics
	Epoch 18 August 1989
Semi-major axis	61952.57 km
Eccentricity	0.00022 ± 0.00008
Orbital period (sidereal)	0.42874431 ± 0.00000001 d
Inclination	0.052 ± 0.011° (to Neptune equator); 0.06° (to local Laplace plane);
Satellite of	Neptune
Group	ring shepherd
Physical characteristics
Dimensions	(204±10) × (184±16) × (144±8) km
Mean radius	88±4 km
Volume	~2.8×106 km3
Mass	1.94×1018 kg
Mean density	~0.69 g/cm3
Surface gravity	~0.012–0.025 m/s2
Escape velocity	~0.05–0.06 km/s
Synodic rotation period	synchronous
Axial tilt	zero
Albedo	0.08
Temperature	~51 K mean (estimate)
Apparent magnitude	21.9

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.

^ Cite error: The named reference Willman-Neptune was invoked but never defined (see the help page).
^ "galatea". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
^ AMIA (1999), Transforming health care through informatics
^ Cite error: The named reference Jacobson2004 was invoked but never defined (see the help page).
^ Cite error: The named reference Showalter2019 was invoked but never defined (see the help page).
^ ^a ^b ^c Cite error: The named reference Karkoschka2003 was invoked but never defined (see the help page).
^ Cite error: The named reference Madeira & GiuliattiWinter 2022 was invoked but never defined (see the help page).
^ Giuliatti Winter et al. (2020), as cited in Madeira & Giuliatti Winter (2022).^[7]
^ ^a ^b Cite error: The named reference jplssd was invoked but never defined (see the help page).

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[2] "galatea". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)

[3] AMIA (1999), Transforming health care through informatics

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[Showalter2019-5] Cite error: The named reference Showalter2019 was invoked but never defined (see the help page).

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[9] Giuliatti Winter et al. (2020), as cited in Madeira & Giuliatti Winter (2022).^[7]

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Discovery
Galatea as seen by Voyager 2 (elongation is due to smearing)
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
Semi-major axis	61952.57 km
Eccentricity	0.00022 ± 0.00008
Orbital period (sidereal)	0.42874431 ± 0.00000001 d
Inclination	0.052 ± 0.011° (to Neptune equator) 0.06° (to local Laplace plane)
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^[a]
Mass	1.94×10¹⁸ kg^[8]
Mean density	~0.69 g/cm³^[b]
Surface gravity	~0.012–0.025 m/s²^[c]
Escape velocity	~0.05–0.06 km/s^[d]
Synodic rotation period	synchronous
Axial tilt	zero
Albedo	0.08^[6]^[9]
Temperature	~51 K mean (estimate)
Apparent magnitude	21.9^[9]