Masahiro Koishikawa
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Template:Short description Template:Infobox scientist
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Template:Nihongo was a Japanese astronomer. He studied both major and minor planets, and discovered multiple asteroids.<ref name="springer" />
Koishikawa was a staff member of the Sendai Astronomical Observatory frin 1972. His research was based out of the Sendai's Ayashi (391) station. The main-belt asteroid 6097 Koishikawa, discovered by Kin Endate and Kazuro Watanabe at Kitami in 1991, was named in his honor.<ref name="springer" /> He died on 26 August 2020 from lung cancer.<ref>小石川正弘さん死去 仙台市天文台元職員 星空の魅力伝える Template:Webarchive Template:In lang</ref>
List of discovered minor planets
| 3994 Ayashi | 2 December 1988 | Template:Small |
| 4292 Aoba | 4 November 1989 | Template:Small |
| 4407 Taihaku | 13 October 1988 | Template:Small |
| 4539 Miyagino | 8 November 1988 | Template:Small |
| 4871 Riverside | 24 November 1989 | Template:Small |
| 5128 Wakabayashi | 30 March 1989 | Template:Small |
| 5751 Zao | 5 January 1992 | Template:Small |
| 6089 Izumi | 5 January 1989 | Template:Small |
| 6190 Rennes | 8 October 1989 | Template:Small |
| 6349 Acapulco | 8 February 1995 | Template:Small |
| 6859 Datemasamune | 13 February 1991 | Template:Small |
| 7485 Changchun | 4 December 1994 | Template:Small |
| 7816 Hanoi | 18 December 1987 | Template:Small |
| 8084 Dallas | 6 February 1989 | Template:Small |
| 10500 Nishi-koen | 3 April 1987 | Template:Small |
| 11514 Tsunenaga | 13 February 1991 | Template:Small |
| 12252 Gwangju | 8 November 1988 | Template:Small |
| 14032 Mego | 4 December 1994 | Template:Small |
| 30963 Mount Banzan | 29 November 1994 | Template:Small |