Dynamics of Neptune's major cloud features

Major cloud features of the planet Neptune, the Great Dark Spot (GDS), the Scooter, the Second Dark Spot (DS2) and the South Polar Features (SPF), are investigated using images obtained from the Voyager. Dynamics of the clouds are investigated using stars to correct navigation errors. The GDS eight-day shape oscillation is observed for more than 2000 hours continuously, and the amplitude is 7.4 degrees in longitude and 1.5 degrees in latitude. GDS moves steadily toward the north. The longitudinal drift in DS2 is a simple function of latitude which matches the zonal wind profile. The Scooter, despite a drift, does not exhibit zonal motions. SPF formations also have a longitudinal drift, the rate of which is the same as that of DS2.