|| La Silla || E. W. Elst || — || align=right | 9.4 km || |-id=536 bgcolor=#E9E9E9 | 21536 || || — || July 26, 1998 || La Silla || E. W. Elst || MAR || align=right | 6.0 km || |-id=537 bgcolor=#d6d6d6 | 21537 Fréchet || 1998 PQ || || August 15, 1998 || Prescott || P. G. Comba || THM || align=right | 7.2 km || |-id=538 bgcolor=#d6d6d6 | 21538 || || — || August 17, 1998 || Višnjan Observatory || Višnjan Obs. || — || align=right | 9.5 km || |-id=539 bgcolor=#d6d6d6 | 21539 Josefhlávka || || || August 20, 1998 || Ondřejov || P. Pravec || — || align=right | 12 km || |-id=540 bgcolor=#d6d6d6 | 21540 Itthipanyanan || || || August 17, 1998 || Socorro || LINEAR || ALA || align=right | 12 km || |-id=541 bgcolor=#d6d6d6 | 21541 Friskop || || || August 17, 1998 || Socorro || LINEAR || EOS || align=right | 5.7 km || |-id=542 bgcolor=#d6d6d6 | 21542 Kennajeannet || || || August 17, 1998 || Socorro || LINEAR || — || align=right | 15 km || |-id=543 bgcolor=#d6d6d6 | 21543 Jessop || || || August 17, 1998 || Socorro || LINEAR || — || align=right | 9.7 km || |-id=544 bgcolor=#E9E9E9 | 21544 Hermainkhan || || || August 17, 1998 || Socorro || LINEAR || — || align=right | 4.5 km || |-id=545 bgcolor=#d6d6d6 | 21545 Koirala || || || August 17, 1998 || Socorro || LINEAR || — || align=right | 10 km || |-id=546 bgcolor=#E9E9E9 | 21546 Konermann || || || August 17, 1998 || Socorro || LINEAR || — || align=right | 4.8 km || |-id=547 bgcolor=#d6d6d6 | 21547 Kottapalli || || || August 17, 1998 || Socorro || LINEAR || THM || align=right | 11 km || |-id=548 bgcolor=#E9E9E9 | 21548 Briekugler || || || August 17, 1998 || Socorro || LINEAR || — || align=right | 11 km || |-id=549 bgcolor=#d6d6d6 | 21549 Carolinelang || || || August 17, 1998 || Socorro || LINEAR || — || align=right | 8.0 km || |-id=550 bgcolor=#E9E9E9 | 21550 Laviolette || || || August 17, 1998 || Socorro || LINEAR || — || align=right | 10 km || |-id=551 bgcolor=#d6d6d6 | 21551 Geyang || || || August 17, 1998 || Socorro || LINEAR || EOS || align=right | 6.7 km || |-id=552 bgcolor=#E9E9E9 | 21552 Richardlee || ||