4.3 km || |-id=251 bgcolor=#E9E9E9 | 150251 || || — || May 12, 1999 || Socorro || LINEAR || — || align=right | 3.3 km || |-id=252 bgcolor=#fefefe | 150252 || || — || June 11, 1999 || Socorro || LINEAR || H || align=right | 1.1 km || |-id=253 bgcolor=#E9E9E9 | 150253 || || — || June 8, 1999 || Socorro || LINEAR || EUN || align=right | 3.7 km || |-id=254 bgcolor=#E9E9E9 | 150254 || || — || June 14, 1999 || Kitt Peak || Spacewatch || EUN || align=right | 2.1 km || |-id=255 bgcolor=#E9E9E9 | 150255 || || — || July 12, 1999 || Socorro || LINEAR || — || align=right | 3.2 km || |-id=256 bgcolor=#d6d6d6 | 150256 || || — || August 3, 1999 || Kitt Peak || Spacewatch || — || align=right | 3.6 km || |-id=257 bgcolor=#fefefe | 150257 || || — || September 3, 1999 || Kitt Peak || Spacewatch || — || align=right | 1.1 km || |-id=258 bgcolor=#d6d6d6 | 150258 || || — || September 7, 1999 || Socorro || LINEAR || — || align=right | 3.9 km || |-id=259 bgcolor=#E9E9E9 | 150259 || || — || September 8, 1999 || Socorro || LINEAR || — || align=right | 5.2 km || |-id=260 bgcolor=#E9E9E9 | 150260 || || — || September 7, 1999 || Socorro || LINEAR || — || align=right | 3.3 km || |-id=261 bgcolor=#d6d6d6 | 150261 || || — || September 7, 1999 || Socorro || LINEAR || — || align=right | 5.5 km || |-id=262 bgcolor=#d6d6d6 | 150262 || || — || September 13, 1999 || Kitt Peak || Spacewatch || KOR || align=right | 1.9 km || |-id=263 bgcolor=#d6d6d6 | 150263 || || — || September 8, 1999 || Socorro || LINEAR || EOS || align=right | 3.5 km || |-id=264 bgcolor=#d6d6d6 | 150264 || || — || September 8, 1999 || Socorro || LINEAR || 7:4 || align=right | 7.3 km || |-id=265 bgcolor=#E9E9E9 | 150265 || || — || September 9, 1999 || Socorro || LINEAR || — || align=right | 4.7 km || |-id=266 bgcolor=#d6d6d6 | 150266 || || — || September 9, 1999 || Socorro || LINEAR || — || align=right | 5.6 km || |-id=267 bgcolor=#d6d6d6 | 150267 || || — || September 9, 1999 || Socorro || LINEAR || EUP || align=right | 7.0 km || |-id=268 bgcolor=#d6d6d6