align=right | 11 km || |-id=513 bgcolor=#d6d6d6 | 38513 || || — || October 3, 1999 || Catalina || CSS || — || align=right | 6.5 km || |-id=514 bgcolor=#d6d6d6 | 38514 || || — || October 4, 1999 || Catalina || CSS || — || align=right | 10 km || |-id=515 bgcolor=#d6d6d6 | 38515 || || — || October 7, 1999 || Catalina || CSS || — || align=right | 11 km || |-id=516 bgcolor=#d6d6d6 | 38516 || || — || October 8, 1999 || Catalina || CSS || — || align=right | 17 km || |-id=517 bgcolor=#E9E9E9 | 38517 || || — || October 9, 1999 || Catalina || CSS || DOR || align=right | 6.6 km || |-id=518 bgcolor=#E9E9E9 | 38518 || || — || October 8, 1999 || Socorro || LINEAR || — || align=right | 4.2 km || |-id=519 bgcolor=#d6d6d6 | 38519 || || — || October 9, 1999 || Socorro || LINEAR || EOS || align=right | 5.8 km || |-id=520 bgcolor=#d6d6d6 | 38520 || || — || October 9, 1999 || Kitt Peak || Spacewatch || — || align=right | 4.8 km || |-id=521 bgcolor=#d6d6d6 | 38521 || || — || October 14, 1999 || Socorro || LINEAR || — || align=right | 11 km || |-id=522 bgcolor=#d6d6d6 | 38522 || || — || October 3, 1999 || Socorro || LINEAR || ALA || align=right | 12 km || |-id=523 bgcolor=#d6d6d6 | 38523 || || — || October 7, 1999 || Socorro || LINEAR || EOS || align=right | 7.8 km || |-id=524 bgcolor=#d6d6d6 | 38524 || || — || October 10, 1999 || Socorro || LINEAR || — || align=right | 7.0 km || |-id=525 bgcolor=#d6d6d6 | 38525 || || — || October 10, 1999 || Socorro || LINEAR || — || align=right | 9.1 km || |-id=526 bgcolor=#d6d6d6 | 38526 || || — || October 1, 1999 || Catalina || CSS || THM || align=right | 8.7 km || |-id=527 bgcolor=#d6d6d6 | 38527 || || — || October 9, 1999 || Socorro || LINEAR || THM || align=right | 7.1 km || |-id=528 bgcolor=#d6d6d6 | 38528 || || — || October 31, 1999 || Fountain Hills || C. W. Juels || EOS || align=right | 7.0 km || |-id=529 bgcolor=#d6d6d6 | 38529 || || — || October 29, 1999 || Xinglong || SCAP || — || align=right | 7.4 km ||