|| || September 26, 1998 || Socorro || LINEAR || THM || align=right | 17 km || |-id=587 bgcolor=#d6d6d6 | 21587 Christopynn || || || September 26, 1998 || Socorro || LINEAR || — || align=right | 21 km || |-id=588 bgcolor=#d6d6d6 | 21588 Gianelli || || || September 26, 1998 || Socorro || LINEAR || THM || align=right | 7.7 km || |-id=589 bgcolor=#E9E9E9 | 21589 Rafes || || || September 26, 1998 || Socorro || LINEAR || — || align=right | 5.3 km || |-id=590 bgcolor=#d6d6d6 | 21590 || 1998 TK || — || October 10, 1998 || Oizumi || T. Kobayashi || — || align=right | 7.9 km || |-id=591 bgcolor=#E9E9E9 | 21591 || || — || October 15, 1998 || Višnjan Observatory || K. Korlević || EUN || align=right | 5.3 km || |-id=592 bgcolor=#d6d6d6 | 21592 || || — || November 8, 1998 || Nachi-Katsuura || Y. Shimizu, T. Urata || — || align=right | 9.1 km || |-id=593 bgcolor=#C2FFFF | 21593 || || — || November 10, 1998 || Socorro || LINEAR || L4 || align=right | 22 km || |-id=594 bgcolor=#E9E9E9 | 21594 || || — || November 13, 1998 || Višnjan Observatory || K. Korlević || CLO || align=right | 9.8 km || |-id=595 bgcolor=#C2FFFF | 21595 || || — || November 18, 1998 || Catalina || CSS || L4 || align=right | 35 km || |-id=596 bgcolor=#fefefe | 21596 || || — || November 23, 1998 || Oohira || T. Urata || ERI || align=right | 7.3 km || |-id=597 bgcolor=#d6d6d6 | 21597 || || — || November 18, 1998 || Kushiro || S. Ueda, H. Kaneda || EOS || align=right | 11 km || |-id=598 bgcolor=#fefefe | 21598 || || — || November 28, 1998 || Višnjan Observatory || K. Korlević || EUT || align=right | 3.1 km || |-id=599 bgcolor=#C2FFFF | 21599 || || — || November 21, 1998 || Socorro || LINEAR || L4 || align=right | 28 km || |-id=600 bgcolor=#d6d6d6 | 21600 || || — || December 7, 1998 || Višnjan Observatory || K. Korlević || EOS || align=right | 10 km || |} 21601–21700 |-bgcolor=#C2FFFF | 21601 || || — || December 15, 1998 || Socorro || LINEAR || L4 || align=right | 55 km || |-id=602 bgcolor=#C2FFFF | 21602 Ialmenus || || || December 17, 1998 || Kleť || M. Tichý, Z. Moravec ||