Neptune VI - 1989N4


Galatea [gal-eh-TEE-eh] lies 37,200 kilometers (23,100 miles) from Neptune. It has a diameter of 180 kilometers (110 miles) and completes an orbit in 10 hours, 18 minutes. It is irregularly shaped and shows no sign of any geological modification. Galatea circles the planet in the same direction as Neptune rotates, and remains close to Neptune's equatorial plane. The above image is smeared so that Galatea appears highly elongated.

Galatea Statistics
 Discovered byVoyager 2 
 Date of discovery1989 
 Mass (kg)
 Equatorial radius (km)79 
 Equatorial radius (Earth = 1)1.2386e-02 
 Mean density (gm/cm^3)
 Mean distance from Neptune (km)62,000 
 Rotational period (days)
 Orbital period (days)0.428745 
 Mean orbital velocity (km/sec)10.52 
 Orbital eccentricity0.0001 
 Orbital inclination (degrees)0.05 
 Visual geometric albedo0.06 
 Magnitude (Vo)22.3 


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Copyright © 1997 by Calvin J. Hamilton. All rights reserved.