1998 || Kitt Peak || Spacewatch || — || align=right | 6.2 km || |-id=254 bgcolor=#E9E9E9 | 49254 || || — || October 14, 1998 || Kitt Peak || Spacewatch || — || align=right | 3.2 km || |-id=255 bgcolor=#fefefe | 49255 || || — || October 15, 1998 || Kitt Peak || Spacewatch || NYS || align=right | 1.6 km || |-id=256 bgcolor=#E9E9E9 | 49256 || || — || October 10, 1998 || Anderson Mesa || LONEOS || — || align=right | 5.5 km || |-id=257 bgcolor=#E9E9E9 | 49257 || || — || October 10, 1998 || Anderson Mesa || LONEOS || — || align=right | 3.1 km || |-id=258 bgcolor=#fefefe | 49258 || || — || October 11, 1998 || Anderson Mesa || LONEOS || — || align=right | 3.2 km || |-id=259 bgcolor=#fefefe | 49259 || || — || October 14, 1998 || Anderson Mesa || LONEOS || V || align=right | 2.6 km || |-id=260 bgcolor=#E9E9E9 | 49260 || || — || October 14, 1998 || Anderson Mesa || LONEOS || — || align=right | 2.0 km || |-id=261 bgcolor=#E9E9E9 | 49261 || || — || October 14, 1998 || Anderson Mesa || LONEOS || — || align=right | 3.3 km || |-id=262 bgcolor=#fefefe | 49262 || || — || October 14, 1998 || Anderson Mesa || LONEOS || NYS || align=right | 2.3 km || |-id=263 bgcolor=#E9E9E9 | 49263 || || — || October 11, 1998 || Anderson Mesa || LONEOS || — || align=right | 4.1 km || |-id=264 bgcolor=#fefefe | 49264 || 1998 UC || — || October 16, 1998 || Catalina || CSS || PHO || align=right | 4.9 km || |-id=265 bgcolor=#fefefe | 49265 || || — || October 20, 1998 || Caussols || ODAS || — || align=right | 1.7 km || |-id=266 bgcolor=#E9E9E9 | 49266 || || — || October 22, 1998 || Caussols || ODAS || — || align=right | 2.1 km || |-id=267 bgcolor=#E9E9E9 | 49267 || || — || October 18, 1998 || Gekko || T. Kagawa || — || align=right | 4.9 km || |-id=268 bgcolor=#E9E9E9 | 49268 || || — || October 23, 1998 || Višnjan Observatory || K. Korlević || EUN || align=right | 3.1 km || |-id=269 bgcolor=#E9E9E9 | 49269 || || — || October 23, 1998 || Višnjan Observatory || K. Korlević || — || align=right | 3.4 km || |-id=270