km || |-id=243 bgcolor=#d6d6d6 | 12243 || || — || September 9, 1988 || Brorfelde || P. Jensen || EOS || align=right | 9.9 km || |-id=244 bgcolor=#d6d6d6 | 12244 Werfel || || || September 8, 1988 || Tautenburg Observatory || F. Börngen || — || align=right | 12 km || |-id=245 bgcolor=#d6d6d6 | 12245 || || — || September 9, 1988 || La Silla || H. Debehogne || — || align=right | 7.0 km || |-id=246 bgcolor=#fefefe | 12246 Pliska || || || September 11, 1988 || Smolyan || V. G. Ivanova || — || align=right | 4.8 km || |-id=247 bgcolor=#d6d6d6 | 12247 Michaelsekerak || || || September 14, 1988 || Cerro Tololo || S. J. Bus || — || align=right | 8.2 km || |-id=248 bgcolor=#d6d6d6 | 12248 Russellcarpenter || || || September 14, 1988 || Cerro Tololo || S. J. Bus || EOS || align=right | 8.6 km || |-id=249 bgcolor=#d6d6d6 | 12249 || || — || September 16, 1988 || Cerro Tololo || S. J. Bus || EOS || align=right | 9.4 km || |-id=250 bgcolor=#d6d6d6 | 12250 || 1988 TT || — || October 13, 1988 || Kushiro || S. Ueda, H. Kaneda || EOS || align=right | 7.6 km || |-id=251 bgcolor=#d6d6d6 | 12251 || || — || October 9, 1988 || Gekko || Y. Oshima || — || align=right | 6.2 km || |-id=252 bgcolor=#d6d6d6 | 12252 Gwangju || || || November 8, 1988 || Ayashi Station || M. Koishikawa || — || align=right | 7.5 km || |-id=253 bgcolor=#d6d6d6 | 12253 || || — || November 3, 1988 || Brorfelde || P. Jensen || — || align=right | 16 km || |-id=254 bgcolor=#d6d6d6 | 12254 || || — || December 7, 1988 || Okutama || T. Hioki, N. Kawasato || — || align=right | 19 km || |-id=255 bgcolor=#fefefe | 12255 || || — || December 7, 1988 || Yorii || M. Arai, H. Mori || V || align=right | 3.8 km || |-id=256 bgcolor=#fefefe | 12256 || || — || February 8, 1989 || La Silla || H. Debehogne || — || align=right | 3.9 km || |-id=257 bgcolor=#E9E9E9 | 12257 Lassine || || || April 3, 1989 || La Silla || E. W. Elst || EUN || align=right | 4.1 km || |-id=258 bgcolor=#E9E9E9 | 12258 Oscarwilde || || || April 3, 1989 || La Silla || E. W.