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Planetary rings Neptune's rings, taken by Voyager 2 Neptune has a planetary ring system, though one much less substantial than that of Saturn . The rings may consist of ice particles coated with silicates or carbon-based material, which most likely gives them a reddish hue.  The three main rings are the narrow Adams Ring, 63000 km from the centre of Neptune, the Le Verrier Ring, at 53000 km, and the broader, fainter Galle Ring, at 42000 km. A faint outward extension to the Le Verrier Ring has been named Lassell; it is bounded at its outer edge by the Arago Ring at 57000 km.  The first of these planetary rings was discovered in 1968 by a team led by Edward Guinan ,   but it was later thought that this ring might be incomplete.  Evidence that the rings might have gaps first arose during a stellar occultation in 1984 when the rings obscured a star on immersion but not on emersion. 
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This note was uploaded on 12/15/2011 for the course AST AST1002 taught by Professor Emilyhoward during the Fall '10 term at Broward College.
- Fall '10