Anderson Mesa || LONEOS || V || align=right | 2.3 km || |-id=502 bgcolor=#E9E9E9 | 21502 Cruz || || || May 24, 1998 || Anderson Mesa || LONEOS || — || align=right | 3.2 km || |-id=503 bgcolor=#E9E9E9 | 21503 Beksha || || || May 22, 1998 || Socorro || LINEAR || — || align=right | 2.6 km || |-id=504 bgcolor=#E9E9E9 | 21504 Caseyfreeman || || || May 22, 1998 || Socorro || LINEAR || — || align=right | 5.3 km || |-id=505 bgcolor=#fefefe | 21505 Bernert || || || May 22, 1998 || Socorro || LINEAR || FLO || align=right | 2.6 km || |-id=506 bgcolor=#fefefe | 21506 Betsill || || || May 22, 1998 || Socorro || LINEAR || — || align=right | 3.8 km || |-id=507 bgcolor=#fefefe | 21507 Bhasin || || || May 22, 1998 || Socorro || LINEAR || NYS || align=right | 1.9 km || |-id=508 bgcolor=#E9E9E9 | 21508 Benbrewer || || || May 22, 1998 || Socorro || LINEAR || — || align=right | 3.8 km || |-id=509 bgcolor=#fefefe | 21509 Lucascavin || || || May 22, 1998 || Socorro || LINEAR || LCA || align=right | 3.1 km || |-id=510 bgcolor=#E9E9E9 | 21510 Chemnitz || || || May 22, 1998 || Socorro || LINEAR || — || align=right | 5.2 km || |-id=511 bgcolor=#fefefe | 21511 Chiardola || || || May 22, 1998 || Socorro || LINEAR || FLO || align=right | 2.8 km || |-id=512 bgcolor=#fefefe | 21512 Susieclary || || || May 22, 1998 || Socorro || LINEAR || FLO || align=right | 3.5 km || |-id=513 bgcolor=#fefefe | 21513 Bethcochran || || || May 22, 1998 || Socorro || LINEAR || V || align=right | 2.9 km || |-id=514 bgcolor=#E9E9E9 | 21514 Gamalski || || || May 22, 1998 || Socorro || LINEAR || — || align=right | 6.3 km || |-id=515 bgcolor=#E9E9E9 | 21515 Gavini || || || May 23, 1998 || Socorro || LINEAR || — || align=right | 4.1 km || |-id=516 bgcolor=#E9E9E9 | 21516 Mariagodinez || || || May 23, 1998 || Socorro || LINEAR || — || align=right | 5.7 km || |-id=517 bgcolor=#fefefe | 21517 Dobi || || || May 23, 1998 || Socorro || LINEAR || — || align=right | 3.3 km || |-id=518 bgcolor=#E9E9E9 | 21518 Maysunhasan || || || May 23, 1998 || Socorro || LINEAR || EUN || align=right