It was given the designation S\/1989 N 4 . The discovery was said ( IAUC 4824 ) on August 2 , 1989 , but the text only talks of `` 10 frames taken over 5 days '' , giving a discovery date of sometime before July 28 . It was given the temporary designation S\/1989 N 4 The discovery was announced ( IAUC 4824 ) on August 2 , 1989 , but the text only talks of `` 10 frames taken over 5 days '' , giving a discovery date of sometime before July 28 .