|| June 6, 1991 || La Silla || E. W. Elst || FLO || align=right | 2.4 km || |-id=484 bgcolor=#fefefe | 23484 || || — || July 12, 1991 || Palomar || H. E. Holt || — || align=right | 6.2 km || |-id=485 bgcolor=#d6d6d6 | 23485 || || — || July 12, 1991 || La Silla || H. Debehogne || — || align=right | 11 km || |-id=486 bgcolor=#fefefe | 23486 || || — || August 2, 1991 || La Silla || E. W. Elst || NYS || align=right | 1.6 km || |-id=487 bgcolor=#d6d6d6 | 23487 || || — || August 3, 1991 || La Silla || E. W. Elst || THM || align=right | 9.5 km || |-id=488 bgcolor=#fefefe | 23488 || || — || August 7, 1991 || Palomar || H. E. Holt || — || align=right | 2.9 km || |-id=489 bgcolor=#fefefe | 23489 || || — || August 7, 1991 || Palomar || H. E. Holt || — || align=right | 6.8 km || |-id=490 bgcolor=#E9E9E9 | 23490 Monikohl || || || September 12, 1991 || Tautenburg Observatory || L. D. Schmadel, F. Börngen || — || align=right | 5.1 km || |-id=491 bgcolor=#fefefe | 23491 || || — || September 13, 1991 || Palomar || H. E. Holt || — || align=right | 4.6 km || |-id=492 bgcolor=#fefefe | 23492 || || — || September 14, 1991 || Palomar || H. E. Holt || V || align=right | 2.8 km || |-id=493 bgcolor=#E9E9E9 | 23493 || 1991 SO || — || September 30, 1991 || Siding Spring || R. H. McNaught || — || align=right | 2.8 km || |-id=494 bgcolor=#fefefe | 23494 || || — || September 16, 1991 || Palomar || H. E. Holt || NYS || align=right | 3.0 km || |-id=495 bgcolor=#fefefe | 23495 Nagaotoshiko || || || October 29, 1991 || Kitami || A. Takahashi, K. Watanabe || — || align=right | 7.9 km || |-id=496 bgcolor=#E9E9E9 | 23496 || || — || November 3, 1991 || Palomar || E. F. Helin || — || align=right | 2.8 km || |-id=497 bgcolor=#E9E9E9 | 23497 || || — || November 5, 1991 || Dynic || A. Sugie || — || align=right | 3.8 km || |-id=498 bgcolor=#fefefe | 23498 || || — || November 6, 1991 || La Silla || E. W. Elst || — || align=right |