Hiroki Kosai
Asteroids discovered: 92
| 2271 Kiso[1] | October 22, 1976 |
| 2330 Ontake[1] | February 18, 1977 |
| 2470 Agematsu[1] | October 22, 1976 |
| 2924 Mitake-mura[1] | February 18, 1977 |
| 2960 Ohtaki[1] | February 18, 1977 |
| 3111 Misuzu[1] | February 19, 1977 |
| 3249 Musashino[1] | February 18, 1977 |
| 3291 Dunlap[1] | November 14, 1982 |
| 3319 Kibi[1] | March 12, 1977 |
| 3320 Namba[1] | November 14, 1982 |
| 3391 Sinon[1] | February 18, 1977 |
| 3392 Setouchi[2] | December 17, 1979 |
| 3607 Naniwa[1] | February 18, 1977 |
| 3878 Jyoumon[1] | November 14, 1982 |
| 4072 Yayoi[1] | October 30, 1981 |
| 4077 Asuka[1] | December 13, 1982 |
| 4186 Tamashima[1] | February 18, 1977 |
| 4272 Entsuji[1] | March 12, 1977 |
| 4526 Konko[1] | May 22, 1982 |
| 4812 Hakuhou[1] | February 18, 1977 |
| 4855 Tenpyou[1] | November 14, 1982 |
| 4890 Shikanosima[1] | November 14, 1982 |
| 4929 Yamatai[1] | December 13, 1982 |
| 4963 Kanroku[1] | February 18, 1977 |
| 5017 Tenchi[1] | February 18, 1977 |
| 5018 Tenmu[1] | February 19, 1977 |
| 5082 Nihonsyoki[1] | February 18, 1977 |
| 5454 Kojiki[1] | March 12, 1977 |
| 5466 Makibi[1] | November 30, 1986 |
| 5541 Seimei[1] | October 22, 1976 |
| 6031 Ryokan[1] | January 26, 1982 |
| 6218 Mizushima[1] | March 12, 1977 |
| 6818 Sessyu[1] | March 11, 1983 |
| 6846 Kansazan[1] | October 22, 1976 |
| 7104 Manyousyu[1] | February 18, 1977 |
| 7105 Yousyozan[1] | February 18, 1977 |
| 7562 Kagiroino-Oka[1] | November 30, 1986 |
| 7627 Wakenokiyomaro[1] | February 18, 1977 |
| 7634 Shizutani-Kou[1] | November 14, 1982 |
| 7991 Kaguyahime[1] | October 30, 1981 |
| 8133 Takanochoei[1] | February 18, 1977 |
| 8144 Hiragagennai[1] | November 14, 1982 |
| 9147 Kourakuen[1] | February 18, 1977 |
| 9153 Chikurinji[1] | October 30, 1981 |
| 9293 Kamogata[1] | December 13, 1982 |
| 9719 Yakage[1] | February 18, 1977 |
| 10006 Sessai[1] | October 22, 1976 |
| 10008 Raisanyo[1] | February 18, 1977 |
| 10009 Hirosetanso[1] | March 12, 1977 |
| 10453 Banzan[1] | February 18, 1977 |
| 11254 Konkohekisui[1] | February 18, 1977 |
| 11255 Fujiiekio[1] | February 18, 1977 |
| 11442 Seijin-Sanso[1] | October 22, 1976 |
| 11827 Wasyuzan[1] | November 14, 1982 |
| 12186 Mitukurigen[1] | March 12, 1977 |
| 12221 Ogatakoan[1] | November 14, 1982 |
| 12682 Kawada[1] | November 14, 1982 |
| 14313 Dodaira[1] | October 22, 1976 |
| 14314 Tokigawa[1] | February 18, 1977 |
| 14315 Ogawamachi[1] | March 12, 1977 |
| 14316 Higashichichibu[1] | March 12, 1977 |
| 14338 Shibakoukan[1] | November 14, 1982 |
| 14795 Syoyou[1] | March 12, 1977 |
| 14820 Aizuyaichi[1] | November 14, 1982 |
| 14821 Motaeno[1] | November 14, 1982 |
| 15202 Yamada-Houkoku[1] | March 12, 1977 |
| 15671 Suzannedébarbat[1] | March 12, 1977 |
| 15672 Sato-Norio[1] | March 12, 1977 |
| 16357 Risanpei[1] | October 22, 1976 |
| (18289) 1976 UB16[1] | October 22, 1976 |
| (18290) 1977 DR2[1] | February 18, 1977 |
| (18291) 1977 DL4[1] | February 18, 1977 |
| (18322) 1982 VF5[1] | November 14, 1982 |
| (19083) 1977 DA4[1] | February 18, 1977 |
| (19917) 1977 EE8[1] | March 12, 1977 |
| (19953) 1982 VU2[1] | November 14, 1982 |
| (19954) 1982 VY3[1] | November 14, 1982 |
| (20962) 1977 EW7[1] | March 12, 1977 |
| (22277) 1982 VK4[1] | November 14, 1982 |
| (24640) 1982 XW1[1] | December 13, 1982 |
| (26794) 1977 DG3[1] | February 18, 1977 |
| (26806) 1982 KX1[1] | May 22, 1982 |
| (26808) 1982 VB4[1] | November 14, 1982 |
| (34995) 1977 DP2[1] | February 18, 1977 |
| (34996) 1977 DH4[1] | February 18, 1977 |
| (37529) 1977 EL8[1] | March 12, 1977 |
| (43753) 1982 VN3[1] | November 14, 1982 |
| (48408) 1982 VN2[1] | November 14, 1982 |
| (52260) 1982 KA[1] | May 22, 1982 |
| (52261) 1982 VL4[1] | November 14, 1982 |
| (65635) 1977 EA8[1] | March 12, 1977 |
| (73639) 1977 EL7[1] | March 12, 1977 |
| (164616) 1986 WV8[1] | November 30, 1976 |
- 1 with K. Hurukawa
- 2 with G. Sasaki
|
Hiroki Kosai (香西 洋樹, Kōsai Hiroki, born 8 February 1933) is a Japanese astronomer with the Tokyo Astronomical Observatory. He is best known for helping to popularize astronomy in Japan and for his observations of comets and asteroids, most notably with his co-discovery the comet 1976 XVI. The asteroid 3370 Kohsai is named in his honor.[1]
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