2.2 km || |-id=274 bgcolor=#fefefe | 460274 || || — || January 4, 2012 || Mount Lemmon || Mount Lemmon Survey || — || align=right data-sort-value="0.82" | 820 m || |-id=275 bgcolor=#d6d6d6 | 460275 || || — || January 26, 2011 || Mount Lemmon || Mount Lemmon Survey || — || align=right | 2.4 km || |-id=276 bgcolor=#d6d6d6 | 460276 || || — || March 26, 2007 || Kitt Peak || Spacewatch || — || align=right | 2.6 km || |-id=277 bgcolor=#E9E9E9 | 460277 || || — || February 11, 2012 || Mount Lemmon || Mount Lemmon Survey || EUN || align=right | 1.0 km || |-id=278 bgcolor=#d6d6d6 | 460278 || || — || December 28, 2005 || Kitt Peak || Spacewatch || — || align=right | 2.3 km || |-id=279 bgcolor=#fefefe | 460279 || || — || October 8, 2004 || Kitt Peak || Spacewatch || — || align=right data-sort-value="0.80" | 800 m || |-id=280 bgcolor=#E9E9E9 | 460280 || || — || August 5, 2010 || WISE || WISE || — || align=right | 1.8 km || |-id=281 bgcolor=#E9E9E9 | 460281 || || — || November 16, 2006 || Mount Lemmon || Mount Lemmon Survey || — || align=right | 1.1 km || |-id=282 bgcolor=#d6d6d6 | 460282 || || — || September 20, 2006 || Kitt Peak || Spacewatch || 3:2 || align=right | 4.5 km || |-id=283 bgcolor=#d6d6d6 | 460283 || || — || December 21, 2005 || Kitt Peak || Spacewatch || KOR || align=right | 1.3 km || |-id=284 bgcolor=#E9E9E9 | 460284 || || — || February 17, 2007 || Mount Lemmon || Mount Lemmon Survey || critical || align=right | 1.6 km || |-id=285 bgcolor=#fefefe | 460285 || || — || November 23, 2011 || Mount Lemmon || Mount Lemmon Survey || — || align=right data-sort-value="0.64" | 640 m || |-id=286 bgcolor=#d6d6d6 | 460286 || || — || September 16, 2003 || Kitt Peak || Spacewatch || — || align=right | 3.4 km || |-id=287 bgcolor=#E9E9E9 | 460287 || || — || November 6, 2010 || Mount Lemmon || Mount Lemmon Survey || — || align=right | 1.5 km || |-id=288 bgcolor=#fefefe | 460288 || || — || December 31, 2008 || Kitt Peak || Spacewatch || — || align=right data-sort-value="0.88" | 880 m || |-id=289 bgcolor=#E9E9E9 | 460289 || || — || November 3, 2005 || Catalina || CSS || — || align=right |