+ Minor planets discovered: 13 4106 Nada March 6, 1989 4797 Ako September 30, 1989 5401 Minamioda March 6, 1989 5685 Sanenobufukui December 8, 1990 5737 Itoh September 30, 1989 5872 Sugano September 30, 1989 6155 Yokosugano November 11, 1990 6557 Yokonomura November 11, 1990 6559 Nomura May 3, 1991 7178 Ikuookamoto November 11, 1990 9580 Tarumi October 4, 1989 10318 Sumaura October 15, 1990 14873 Shoyo October 28, 1990 co-discovered with T. Nomura co-discovered with M. Sugano
is a Japanese dentist, amateur astronomer and discoverer of 13 minor planets.
He lives in the city of Akō in the Hyōgo Prefecture, Japan, where his private Minami-Oda Observatory () is located. At the observatory, he observes comets and minor planets using his home-made 0.20-m reflector telescope together with his wife Kumi and daughter Saki. Familiar with electronics and mechanics, he has also developed his own CCD instrumentation.
The asteroid 5591 Koyo, discovered by Japanese astronomer Takeshi Urata, was named in his honour.
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