J. Bus || L5 || align=right | 18 km || |-id=276 bgcolor=#E9E9E9 | 52276 || || — || September 14, 1988 || Cerro Tololo || S. J. Bus || — || align=right | 5.7 km || |-id=277 bgcolor=#E9E9E9 | 52277 || || — || September 16, 1988 || Cerro Tololo || S. J. Bus || — || align=right | 3.6 km || |-id=278 bgcolor=#C2FFFF | 52278 || || — || September 16, 1988 || Cerro Tololo || S. J. Bus || L5 || align=right | 20 km || |-id=279 bgcolor=#E9E9E9 | 52279 || || — || February 4, 1989 || La Silla || E. W. Elst || DOR || align=right | 6.5 km || |-id=280 bgcolor=#E9E9E9 | 52280 || 1989 RB || — || September 5, 1989 || Palomar || E. F. Helin || — || align=right | 7.0 km || |-id=281 bgcolor=#E9E9E9 | 52281 || || — || September 26, 1989 || La Silla || E. W. Elst || — || align=right | 2.6 km || |-id=282 bgcolor=#fefefe | 52282 || || — || September 26, 1989 || La Silla || E. W. Elst || — || align=right | 2.0 km || |-id=283 bgcolor=#E9E9E9 | 52283 || || — || September 26, 1989 || La Silla || E. W. Elst || — || align=right | 2.9 km || |-id=284 bgcolor=#fefefe | 52284 || 1990 HP || — || April 26, 1990 || Palomar || E. F. Helin || H || align=right | 2.1 km || |-id=285 bgcolor=#fefefe | 52285 Kakurinji || || || July 30, 1990 || Geisei || T. Seki || NYS || align=right | 1.9 km || |-id=286 bgcolor=#fefefe | 52286 || || — || August 22, 1990 || Palomar || H. E. Holt || NYS || align=right | 2.4 km || |-id=287 bgcolor=#fefefe | 52287 || || — || August 23, 1990 || Palomar || H. E. Holt || NYS || align=right | 4.6 km || |-id=288 bgcolor=#d6d6d6 | 52288 || || — || August 16, 1990 || La Silla || E. W. Elst || THM || align=right | 7.9 km || |-id=289 bgcolor=#fefefe | 52289 || || — || August 16, 1990 || La Silla || E. W. Elst || NYS || align=right | 2.1 km || |-id=290 bgcolor=#d6d6d6 | 52290 || 1990 SF || — || September 17, 1990 || Siding Spring || R. H. McNaught || — || align=right | 8.6 km ||