|| — || September 14, 1998 || Kitt Peak || Spacewatch || THM || align=right | 8.4 km || |-id=570 bgcolor=#E9E9E9 | 21570 Muralidhar || || || September 14, 1998 || Socorro || LINEAR || EUN || align=right | 18 km || |-id=571 bgcolor=#E9E9E9 | 21571 Naegeli || || || September 14, 1998 || Socorro || LINEAR || — || align=right | 5.0 km || |-id=572 bgcolor=#E9E9E9 | 21572 Nguyen-McCarty || || || September 14, 1998 || Socorro || LINEAR || — || align=right | 4.0 km || |-id=573 bgcolor=#d6d6d6 | 21573 || || — || September 14, 1998 || Socorro || LINEAR || 7:4 || align=right | 14 km || |-id=574 bgcolor=#d6d6d6 | 21574 Ouzan || || || September 14, 1998 || Socorro || LINEAR || — || align=right | 5.3 km || |-id=575 bgcolor=#E9E9E9 | 21575 Padmanabhan || || || September 14, 1998 || Socorro || LINEAR || MRX || align=right | 5.0 km || |-id=576 bgcolor=#d6d6d6 | 21576 McGivney || || || September 19, 1998 || Needville || W. G. Dillon || THM || align=right | 8.9 km || |-id=577 bgcolor=#fefefe | 21577 Negron || || || September 17, 1998 || Anderson Mesa || LONEOS || FLO || align=right | 3.2 km || |-id=578 bgcolor=#E9E9E9 | 21578 || || — || September 24, 1998 || Catalina || CSS || — || align=right | 17 km || |-id=579 bgcolor=#d6d6d6 | 21579 || || — || September 25, 1998 || Kitt Peak || Spacewatch || THM || align=right | 8.7 km || |-id=580 bgcolor=#d6d6d6 | 21580 Portalatin || || || September 17, 1998 || Anderson Mesa || LONEOS || KOR || align=right | 6.2 km || |-id=581 bgcolor=#d6d6d6 | 21581 Ernestoruiz || || || September 17, 1998 || Anderson Mesa || LONEOS || EOS || align=right | 13 km || |-id=582 bgcolor=#E9E9E9 | 21582 Arunvenkataraman || || || September 17, 1998 || Anderson Mesa || LONEOS || — || align=right | 4.7 km || |-id=583 bgcolor=#d6d6d6 | 21583 Caropietsch || || || September 26, 1998 || Socorro || LINEAR || HYG || align=right | 18 km || |-id=584 bgcolor=#d6d6d6 | 21584 Polepeddi || || || September 26, 1998 || Socorro || LINEAR || — || align=right | 8.8 km || |-id=585 bgcolor=#E9E9E9 | 21585 Polmear || || || September 26, 1998 || Socorro || LINEAR || — || align=right | 5.4 km || |-id=586 bgcolor=#d6d6d6 | 21586 Pourkaviani ||