Original: IAU Circular 3608 describing the discovery of S/1981 N 1 The moon was recovered and confirmed to be the only object in its orbit during the Voyager 2 flyby in 1989 [ on page 1435 ] after which it received the additional designation S/1989 N 2 on August 2 , 1989 .
Simplified: The moon was refound and confirmed to be the only object in its orbit during the Voyager 2 flyby in 1989 after which it received another designation S/1989 N 2 on August 2 , 1989 .