Koichi Nishiyama (b. 1938) is an amateur astronomer who has observed meteors and searched for comets for many years. He discovered a nova in M33 in 2007. Also known as a mountaineer, he has climbed Kilimanjaro, Elbrus and Aconcagua.
Discovered on 26-10-1989 in Kushiro by Ueda, S., Kaneda, H.