1991 UK2. Discovered 1991 Oct. 29 by K. Endate and K. Watanabe at Kitami.
Named in honor of Masahiro Koishikawa (1952– ), a staff member of the Sendai Astronomical Observatory since 1972. He has made great efforts to observe major planets, minor planets and comets at the observatory’s Ayashi station. He has also attempted to develop public awareness of astronomy as a social educational project. (M 26931)