|| Socorro || LINEAR || — || align=right | 7.9 km || |-id=496 bgcolor=#d6d6d6 | 38496 || || — || October 4, 1999 || Socorro || LINEAR || — || align=right | 8.9 km || |-id=497 bgcolor=#d6d6d6 | 38497 || || — || October 6, 1999 || Socorro || LINEAR || — || align=right | 7.8 km || |-id=498 bgcolor=#d6d6d6 | 38498 || || — || October 7, 1999 || Socorro || LINEAR || — || align=right | 6.4 km || |-id=499 bgcolor=#d6d6d6 | 38499 || || — || October 9, 1999 || Socorro || LINEAR || — || align=right | 6.7 km || |-id=500 bgcolor=#d6d6d6 | 38500 || || — || October 10, 1999 || Socorro || LINEAR || EOS || align=right | 4.1 km || |} 38501–38600 |-bgcolor=#d6d6d6 | 38501 || || — || October 10, 1999 || Socorro || LINEAR || THM || align=right | 6.4 km || |-id=502 bgcolor=#d6d6d6 | 38502 || || — || October 10, 1999 || Socorro || LINEAR || THM || align=right | 7.1 km || |-id=503 bgcolor=#d6d6d6 | 38503 || || — || October 12, 1999 || Socorro || LINEAR || — || align=right | 6.5 km || |-id=504 bgcolor=#E9E9E9 | 38504 || || — || October 12, 1999 || Socorro || LINEAR || — || align=right | 5.9 km || |-id=505 bgcolor=#d6d6d6 | 38505 || || — || October 12, 1999 || Socorro || LINEAR || — || align=right | 9.2 km || |-id=506 bgcolor=#d6d6d6 | 38506 || || — || October 12, 1999 || Socorro || LINEAR || — || align=right | 9.7 km || |-id=507 bgcolor=#d6d6d6 | 38507 || || — || October 12, 1999 || Socorro || LINEAR || — || align=right | 14 km || |-id=508 bgcolor=#d6d6d6 | 38508 || || — || October 15, 1999 || Socorro || LINEAR || — || align=right | 8.4 km || |-id=509 bgcolor=#E9E9E9 | 38509 || || — || October 1, 1999 || Catalina || CSS || — || align=right | 10 km || |-id=510 bgcolor=#d6d6d6 | 38510 || || — || October 2, 1999 || Catalina || CSS || VER || align=right | 6.4 km || |-id=511 bgcolor=#d6d6d6 | 38511 || || — || October 5, 1999 || Anderson Mesa || LONEOS || EMA || align=right | 8.4 km || |-id=512 bgcolor=#d6d6d6 | 38512 || || — || October 3, 1999 || Socorro || LINEAR || — ||