Elst || — || align=right | 3.6 km || |-id=259 bgcolor=#fefefe | 12259 Szukalski || || || September 26, 1989 || La Silla || E. W. Elst || — || align=right | 4.0 km || |-id=260 bgcolor=#d6d6d6 | 12260 || || — || September 30, 1989 || La Silla || H. Debehogne || KOR || align=right | 6.8 km || |-id=261 bgcolor=#fefefe | 12261 Ledouanier || || || October 7, 1989 || La Silla || E. W. Elst || — || align=right | 2.3 km || |-id=262 bgcolor=#E9E9E9 | 12262 Nishio || 1989 UL || || October 21, 1989 || Kitami || K. Endate, K. Watanabe || — || align=right | 4.6 km || |-id=263 bgcolor=#fefefe | 12263 || || — || December 30, 1989 || Siding Spring || R. H. McNaught || — || align=right | 3.5 km || |-id=264 bgcolor=#fefefe | 12264 || 1990 CD || — || February 1, 1990 || Dynic || A. Sugie || — || align=right | 4.0 km || |-id=265 bgcolor=#fefefe | 12265 || 1990 FG || — || March 23, 1990 || Palomar || E. F. Helin || H || align=right | 4.7 km || |-id=266 bgcolor=#fefefe | 12266 || 1990 FL || — || March 23, 1990 || Palomar || E. F. Helin || PHO || align=right | 3.9 km || |-id=267 bgcolor=#fefefe | 12267 Denneau || || || May 31, 1990 || Kitt Peak || Spacewatch || H || align=right | 1.4 km || |-id=268 bgcolor=#E9E9E9 | 12268 || || — || July 29, 1990 || Palomar || H. E. Holt || — || align=right | 6.7 km || |-id=269 bgcolor=#E9E9E9 | 12269 || 1990 QR || — || August 19, 1990 || Palomar || E. F. Helin || EUN || align=right | 9.8 km || |-id=270 bgcolor=#E9E9E9 | 12270 Bozar || || || August 16, 1990 || La Silla || E. W. Elst || — || align=right | 7.1 km || |-id=271 bgcolor=#E9E9E9 | 12271 || || — || September 14, 1990 || Palomar || H. E. Holt || — || align=right | 5.4 km || |-id=272 bgcolor=#E9E9E9 | 12272 Geddylee || || || September 22, 1990 || Palomar || B. Roman || EUN || align=right | 6.5 km || |-id=273 bgcolor=#E9E9E9 | 12273 || || — || October 9, 1990 || Siding Spring || R. H. McNaught || — || align=right | 11 km || |-id=274 bgcolor=#E9E9E9 |