|| EOS || align=right | 6.9 km || |-id=513 bgcolor=#E9E9E9 | 20513 Lazio || || || September 10, 1999 || Campo Catino || F. Mallia, G. Masi || — || align=right | 2.6 km || |-id=514 bgcolor=#d6d6d6 | 20514 || || — || September 7, 1999 || Višnjan Observatory || K. Korlević || ANF || align=right | 5.0 km || |-id=515 bgcolor=#d6d6d6 | 20515 || || — || September 11, 1999 || Višnjan Observatory || K. Korlević || EOS || align=right | 9.4 km || |-id=516 bgcolor=#d6d6d6 | 20516 || || — || September 11, 1999 || Višnjan Observatory || K. Korlević || KOR || align=right | 5.5 km || |-id=517 bgcolor=#E9E9E9 | 20517 Judycrystal || || || September 11, 1999 || Olathe || L. Robinson || HNS || align=right | 3.7 km || |-id=518 bgcolor=#d6d6d6 | 20518 Rendtel || || || September 12, 1999 || Drebach || A. Knöfel || — || align=right | 12 km || |-id=519 bgcolor=#d6d6d6 | 20519 || || — || September 12, 1999 || Višnjan Observatory || K. Korlević || — || align=right | 9.7 km || |-id=520 bgcolor=#E9E9E9 | 20520 || || — || September 13, 1999 || Višnjan Observatory || K. Korlević || EUN || align=right | 12 km || |-id=521 bgcolor=#d6d6d6 | 20521 || || — || September 13, 1999 || Višnjan Observatory || K. Korlević || VER || align=right | 11 km || |-id=522 bgcolor=#fefefe | 20522 Yogeshwar || || || September 13, 1999 || Drebach || A. Knöfel || — || align=right | 3.6 km || |-id=523 bgcolor=#d6d6d6 | 20523 || || — || September 13, 1999 || Višnjan Observatory || K. Korlević || VER || align=right | 18 km || |-id=524 bgcolor=#E9E9E9 | 20524 Bustersikes || || || September 13, 1999 || Fountain Hills || C. W. Juels || GEF || align=right | 7.1 km || |-id=525 bgcolor=#E9E9E9 | 20525 || || — || September 14, 1999 || Višnjan Observatory || K. Korlević || — || align=right | 11 km || |-id=526 bgcolor=#fefefe | 20526 Bathompson || || || September 7, 1999 || Socorro || LINEAR || FLO || align=right | 2.1 km || |-id=527 bgcolor=#fefefe | 20527 Dajowestrich || || || September 7, 1999 || Socorro || LINEAR || NYS || align=right | 2.9 km || |-id=528 bgcolor=#d6d6d6 | 20528 Kyleyawn || || || September 7, 1999 || Socorro || LINEAR || KOR || align=right | 4.7