| 150268 || || — || September 9, 1999 || Socorro || LINEAR || — || align=right | 2.9 km || |-id=269 bgcolor=#d6d6d6 | 150269 || || — || September 9, 1999 || Socorro || LINEAR || — || align=right | 3.7 km || |-id=270 bgcolor=#d6d6d6 | 150270 || || — || September 14, 1999 || Kitt Peak || Spacewatch || — || align=right | 3.5 km || |-id=271 bgcolor=#d6d6d6 | 150271 || || — || September 8, 1999 || Socorro || LINEAR || — || align=right | 5.9 km || |-id=272 bgcolor=#d6d6d6 | 150272 || || — || September 8, 1999 || Socorro || LINEAR || — || align=right | 11 km || |-id=273 bgcolor=#d6d6d6 | 150273 || || — || September 8, 1999 || Catalina || CSS || — || align=right | 3.5 km || |-id=274 bgcolor=#d6d6d6 | 150274 || 1999 SS || — || September 16, 1999 || Kitt Peak || Spacewatch || — || align=right | 6.1 km || |-id=275 bgcolor=#fefefe | 150275 || || — || October 14, 1999 || Ondřejov || L. Kotková || FLO || align=right data-sort-value="0.84" | 840 m || |-id=276 bgcolor=#d6d6d6 | 150276 || || — || October 1, 1999 || Catalina || CSS || — || align=right | 6.2 km || |-id=277 bgcolor=#d6d6d6 | 150277 || || — || October 3, 1999 || Kitt Peak || Spacewatch || HYG || align=right | 5.2 km || |-id=278 bgcolor=#d6d6d6 | 150278 || || — || October 4, 1999 || Kitt Peak || Spacewatch || — || align=right | 4.5 km || |-id=279 bgcolor=#d6d6d6 | 150279 || || — || October 4, 1999 || Kitt Peak || Spacewatch || THM || align=right | 4.0 km || |-id=280 bgcolor=#d6d6d6 | 150280 || || — || October 6, 1999 || Kitt Peak || Spacewatch || THM || align=right | 4.4 km || |-id=281 bgcolor=#d6d6d6 | 150281 || || — || October 6, 1999 || Kitt Peak || Spacewatch || HYG || align=right | 4.8 km || |-id=282 bgcolor=#d6d6d6 | 150282 || || — || October 10, 1999 || Kitt Peak || Spacewatch || — || align=right | 2.8 km || |-id=283 bgcolor=#d6d6d6 | 150283 || || — || October 12, 1999 || Kitt Peak || Spacewatch || — || align=right | 4.5 km || |-id=284 bgcolor=#fefefe | 150284 || || — || October 2, 1999 || Socorro || LINEAR || FLO || align=right | 1.3