|| Catalina || CSS || MAR || align=right | 3.0 km || |-id=251 bgcolor=#d6d6d6 | 178251 || || — || October 12, 2007 || Socorro || LINEAR || — || align=right | 6.1 km || |-id=252 bgcolor=#E9E9E9 | 178252 || || — || October 13, 2007 || Socorro || LINEAR || AGN || align=right | 2.0 km || |-id=253 bgcolor=#fefefe | 178253 || || — || October 30, 2007 || Kitt Peak || Spacewatch || — || align=right | 1.7 km || |-id=254 bgcolor=#E9E9E9 | 178254 || || — || November 4, 2007 || Mount Lemmon || Mount Lemmon Survey || — || align=right | 3.9 km || |-id=255 bgcolor=#d6d6d6 | 178255 || || — || November 3, 2007 || Socorro || LINEAR || — || align=right | 6.8 km || |-id=256 bgcolor=#E9E9E9 | 178256 Juanmi || || || November 3, 2007 || La Cañada || J. Lacruz || AGN || align=right | 1.9 km || |-id=257 bgcolor=#fefefe | 178257 || || — || November 3, 2007 || Kitt Peak || Spacewatch || V || align=right | 1.0 km || |-id=258 bgcolor=#E9E9E9 | 178258 || || — || November 4, 2007 || Mount Lemmon || Mount Lemmon Survey || — || align=right | 1.8 km || |-id=259 bgcolor=#E9E9E9 | 178259 || || — || November 7, 2007 || Mount Lemmon || Mount Lemmon Survey || — || align=right | 3.5 km || |-id=260 bgcolor=#E9E9E9 | 178260 || || — || November 14, 2007 || Kitt Peak || Spacewatch || EUN || align=right | 2.5 km || |-id=261 bgcolor=#E9E9E9 | 178261 || || — || November 14, 2007 || RAS || A. Lowe || — || align=right | 2.5 km || |-id=262 bgcolor=#E9E9E9 | 178262 || || — || November 18, 2007 || Socorro || LINEAR || — || align=right | 2.8 km || |-id=263 bgcolor=#d6d6d6 | 178263 Wienphilo || || || November 29, 2007 || Lulin Observatory || Q.-z. Ye || EUP || align=right | 6.0 km || |-id=264 bgcolor=#E9E9E9 | 178264 || || — || December 16, 2007 || Bergisch Gladbach || W. Bickel || MAR || align=right | 1.9 km || |-id=265 bgcolor=#fefefe | 178265 || || — || December 31, 2007 || Mount Lemmon || Mount Lemmon Survey || NYS || align=right | 1.0 km || |-id=266 bgcolor=#fefefe | 178266 || || — || December 30, 2007 || Mount Lemmon || Mount Lemmon Survey || — ||