# Tsutomu Seki

Minor planets discovered: 225 :
* see § List of discovered minor planets
Tsutomu Seki (関 勉, Seki Tsutomu, born November 3, 1930) is a Japanese amateur astronomer and discoverer of minor planets and comets, born in Kōchi, Japan.

## Career

Tsutomu Seki is the Director of the Geisei Observatory in Kōchi, and in charge of the Comet Section of the Oriental Astronomical Association. Between 1961 and 1970, he had visually discovered six comets, including C/1965 S1 (Ikeya-Seki), the well known great comet of 1965.
He has also discovered a large number of asteroids such as 13553 Masaakikoyama and 5209 Oloosson, a near-Earth Amor asteroid and a Jupiter trojan, respectively. Many of his discoveries are named after famous sites in Kōchi, such as Harimaya-bashi, Ryōma (after Sakamoto Ryōma), Katsurahama beach, and Kagami-gawa.

## Awards and honors

Asteroid 3426 Seki, discovered by Karl Reinmuth at the Heidelberg Observatory in 1932, was named in his honor. The official naming citation was published by the Minor Planet Center on 16 December 1986 (M.P.C. 11443).

## List of discovered minor planets

| 2396 Kochi | 9 February 1981 | list |
| 2571 Geisei | 23 October 1981 | list |
| 2582 Harimaya-Bashi | 26 September 1981 | list |
| 2621 Goto | 9 February 1981 | list |
| 2835 Ryoma | 20 November 1982 | list |
| 2880 Nihondaira | 8 February 1983 | list |
| 2961 Katsurahama | 7 December 1982 | list |
| 3150 Tosa | 11 February 1983 | list |
| 3182 Shimanto | 27 November 1984 | list |
| 3262 Miune | 28 November 1983 | list |
| 3431 Nakano | 24 August 1984 | list |
| 3785 Kitami | 30 November 1986 | list |
| 3822 Segovia | 21 February 1988 | list |
| 3851 Alhambra | 30 October 1986 | list |
| 3914 Kotogahama | 16 September 1987 | list |
| 3935 Toatenmongakkai | 14 August 1987 | list |
| 4039 Souseki | 17 September 1987 | list |
| 4095 Ishizuchisan | 16 September 1987 | list |
| 4097 Tsurugisan | 18 November 1987 | list |
| 4101 Ruikou | 8 February 1988 | list |
| 4223 Shikoku | 7 May 1988 | list |
| 4256 Kagamigawa | 3 October 1986 | list |
| 4290 Heisei | 30 October 1989 | list |
| 4399 Ashizuri | 21 October 1984 | list |
| 4411 Kochibunkyo | 3 January 1990 | list |
| 4439 Muroto | 2 November 1984 | list |
| 4441 Toshie | 26 January 1985 | list |
| 4496 Kamimachi | 9 December 1988 | list |
| 4498 Shinkoyama | 5 January 1989 | list |
| 4505 Okamura | 20 February 1990 | list |
| 4578 Kurashiki | 7 December 1988 | list |
| 4606 Saheki | 27 October 1987 | list |
| 4639 Minox | 5 March 1989 | list |
| 4670 Yoshinogawa | 19 December 1987 | list |
| 4675 Ohboke | 19 September 1990 | list |
| 4841 Manjiro | 28 October 1989 | list |
| 4865 Sor | 18 October 1988 | list |
| 5058 Tarrega | 28 July 1987 | list |
| 5113 Kohno | 19 January 1988 | list |
| 5124 Muraoka | 4 February 1989 | list |
| 5141 Tachibana | 16 December 1990 | list |
| 5179 Takeshima | 1 March 1989 | list |
| 5209 Oloosson | 13 February 1989 | list |
| 5815 Shinsengumi | 3 January 1989 | list |
| 5823 Oryo | 20 December 1989 | list |
| 5824 Inagaki | 24 December 1989 | list |
| 5862 Sakanoue | 13 January 1983 | list |
| 5915 Yoshihiro | 9 March 1991 | list |
| 5962 Shikokutenkyo | 18 April 1990 | list |
| 5966 Tomeko | 15 November 1990 | list |
| 5969 Ryuichiro | 17 March 1991 | list |
| 6088 Hoshigakubo | 18 October 1988 | list |
| 6237 Chikushi | 4 February 1989 | list |
| 6244 Okamoto | 20 August 1990 | list |
| 6302 Tengukogen | 2 February 1989 | list |
| 6399 Harada | 3 April 1991 | list |
| 6449 Kudara | 7 February 1991 | list |
| 6458 Nouda | 2 October 1992 | list |
| 6497 Yamasaki | 27 October 1992 | list |
| 6514 Torahiko | 25 November 1987 | list |
| 6606 Makino | 16 October 1990 | list |
| 6660 Matsumoto | 16 January 1993 | list |
| 6699 Igaueno | 19 December 1987 | list |
| 6720 Gifu | 11 November 1990 | list |
| 6925 Susumu | 24 October 1993 | list |
| 6965 Niyodogawa | 11 November 1990 | list |
| 6971 Omogokei | 8 February 1992 | list |
| 7017 Uradowan | 1 February 1992 | list |
| 7094 Godaisan | 4 September 1992 | list |
| 7125 Eitarodate | 7 February 1991 | list |
| 7235 Hitsuzan | 30 October 1986 | list |
| 7274 Washioyama | 21 March 1982 | list |
| 7287 Yokokurayama | 10 November 1990 | list |
| 7289 Kamegamori | 5 May 1991 | list |
| 7410 Kawazoe | 20 August 1990 | list |
| 7415 Susumuimoto | 14 November 1990 | list |
| 7463 Oukawamine | 20 September 1985 | list |
| 7594 Shotaro | 19 January 1993 | list |
| 7650 Kaname | 16 October 1990 | list |
| 7693 Hoshitakuhai | 20 November 1982 | list |
| 8083 Mayeda | 1 November 1988 | list |
| 8163 Ishizaki | 27 October 1990 | list |
| 8234 Nobeoka | 3 November 1997 | list |
| 8367 Bokusui | 23 October 1990 | list |
| 8375 Kenzokohno | 12 January 1992 | list |
| 8387 Fujimori | 19 February 1993 | list |
| 8428 Okiko | 3 November 1997 | list |
| 8485 Satoru | 29 March 1989 | list |
| 8492 Kikuoka | 21 January 1990 | list |
| 8732 Champion | 8 December 1996 | list |
| 8877 Rentaro | 19 January 1993 | list |
| 8957 Koujounotsuki | 22 March 1998 | list |
| 9032 Tanakami | 23 November 1989 | list |
| 9062 Ohnishi | 27 November 1992 | list |
| 9063 Washi | 17 December 1992 | list |
| 9196 Sukagawa | 27 November 1992 | list |
| 9198 Sasagamine | 25 January 1993 | list |
| 9323 Hirohisasato | 11 February 1989 | list |
| 9409 Kanpuzan | 25 January 1995 | list |
| 9745 Shinkenwada | 2 November 1988 | list |
| 9751 Kadota | 20 August 1990 | list |
| 9756 Ezaki | 12 February 1991 | list |
| 9852 Gora | 24 December 1990 | list |
| 9870 Maehata | 24 February 1992 | list |
| 9964 Hideyonoguchi | 13 February 1992 | list |
| 10078 Stanthorpe | 30 October 1989 | list |
| 10091 Bandaisan | 11 November 1990 | list |
| 10094 Eijikato | 20 February 1991 | list |
| 10167 Yoshiwatiso | 31 January 1995 | list |
| 10300 Tanakadate | 6 March 1989 | list |
| 10321 Rampo | 26 October 1990 | list |
| 10547 Yosakoi | 2 May 1992 | list |
| 10791 Uson | 8 February 1992 | list |
| 10803 Caléyo | 21 October 1992 | list |
| 10829 Matsuobasho | 22 October 1993 | list |
| 11288 Okunohosomichi | 10 December 1990 | list |
| 11294 Kazu | 4 February 1992 | list |
| 11296 Denzen | 24 May 1992 | list |
| 11304 Cowra | 19 February 1993 | list |
| 11321 Tosimatumoto | 21 February 1995 | list |
| 11361 Orbinskij | 28 February 1998 | list |
| 11516 Arthurpage | 6 March 1991 | list |
| 11878 Hanamiyama | 18 April 1990 | list |
| 11925 Usubae | 23 December 1992 | list |
| 11927 Mount Kent | 16 January 1993 | list |
| 12084 Unno | 22 March 1998 | list |
| 12277 Tajimasatonokai | 17 November 1990 | list |
| 12335 Tatsukushi | 21 November 1992 | list |
| 12690 Kochimiraikagaku | 5 November 1988 | list |
| 12706 Tanezaki | 15 October 1990 | list |
| 12749 Odokaigan | 2 February 1993 | list |
| 13015 Noradokei | 14 December 1987 | list |
| 13529 Yokaboshi | 1 September 1991 | list |
| 13553 Masaakikoyama | 2 May 1992 | list |
| 13569 Oshu | 4 March 1993 | list |
| 13918 Tsukinada | 24 August 1984 | list |
| 13933 Charleville | 2 November 1988 | list |
| 13978 Hiwasa | 4 May 1992 | list |
| 13989 Murikabushi | 16 January 1993 | list |
| 14012 Amedee | 6 December 1993 | list |
| 14880 Moa | 7 February 1991 | list |
| 15238 Hisaohori | 2 February 1989 | list |
| 15252 Yoshiken | 20 July 1990 | list |
| 15723 Girraween | 20 September 1990 | list |
| 15739 Matsukuma | 9 March 1991 | list |
| 16503 Ayato | 15 October 1990 | list |
| 16602 Anabuki | 17 March 1993 | list |
| 17461 Shigosenger | 20 October 1990 | list |
| 17465 Inawashiroko | 11 November 1990 | list |
| 17508 Takumadan | 3 May 1992 | list |
| 17509 Ikumadan | 4 May 1992 | list |
| 18365 Shimomoto | 17 November 1990 | list |
| 18400 Muramatsushigeru | 25 November 1992 | list |
| 18609 Shinobuyama | 30 January 1998 | list |
| 18644 Arashiyama | 2 March 1998 | list |
| 19156 Heco | 20 September 1990 | list |
| 19161 Sakawa | 15 October 1990 | list |
| 19197 Akasaki | 6 March 1992 | list |
| 19210 Higayoshihiro | 25 December 1992 | list |
| 20040 Tatsuyamatsuyama | 21 November 1992 | list |
| 20102 Takasago | 31 January 1995 | list |
| 21014 Daishi | 13 October 1988 | list |
| 21016 Miyazawaseiroku | 2 November 1988 | list |
| 21022 Ike | 2 February 1989 | list |
| 21089 Mochizuki | 8 February 1992 | list |
| 21126 Katsuyoshi | 19 January 1993 | list |
| 21166 Nobuyukishouji | 6 December 1993 | list |
| 21282 Shimizuyuka | 14 October 1996 | list |
| 23468 Kannabe | 20 September 1990 | list |
| 23478 Chikumagawa | 21 January 1991 | list |
| 23504 Haneda | 7 March 1992 | list |
| 23587 Abukumado | 2 October 1995 | list |
| 24889 Tamurahosinomura | 11 December 1996 | list |
| 26092 Norikonoriyuki | 16 September 1987 | list |
| 26097 Kamishi | 6 November 1988 | list |
| 26123 Hiroshiyoshida | 29 July 1992 | list |
| 26127 Otakasakajyo | 19 January 1993 | list |
| 26151 Irinokaigan | 2 October 1994 | list |
| 26837 Yoshitakaokazaki | 7 September 1991 | list |
| 27716 Nobuyuki | 13 February 1989 | list |
| 27739 Kimihiro | 17 October 1990 | list |
| 27740 Obatomoyuki | 20 October 1990 | list |
| 27790 Urashimataro | 13 February 1993 | list |
| 29157 Higashinihon | 11 March 1989 | list |
| 29186 Lake Tekapo | 26 October 1990 | list |
| 29199 Himeji | 17 March 1991 | list |
| 29249 Hiraizumi | 26 September 1992 | list |
| 29252 Konjikido | 25 January 1993 | list |
| 29337 Hakurojo | 6 January 1995 | list |
| 30838 Hitomiyamasaki | 7 February 1991 | list |
| 30879 Hiroshikanai | 25 May 1992 | list |
| 30888 Okitsumisaki | 19 January 1993 | list |
| 32858 Kitakamigawa | 25 January 1993 | list |
| 35076 Yataro | 21 January 1990 | list |
| 35093 Akicity | 14 March 1991 | list |
| 37729 Akiratakao | 14 October 1996 | list |
| 39558 Kishine | 24 May 1992 | list |
| 39566 Carllewis | 26 September 1992 | list |
| 39712 Ehimedaigaku | 14 October 1996 | list |
| 39809 Fukuchan | 30 November 1997 | list |
| 42566 Ryutaro | 3 December 1996 | list |
| (43792) 1990 VY$_1$ | 11 November 1990 | list |
| 43794 Yabetakemoto | 19 December 1990 | list |
| (43803) 1991 RH$_2$ | 7 September 1991 | list |
| 43857 Tanijinzan | 15 November 1993 | list |
| 46580 Ryouichiirie | 2 April 1992 | list |
| 46592 Marinawatanabe | 16 December 1992 | list |
| 46595 Kita-Kyushu | 29 December 1992 | list |
| 46596 Tobata | 16 January 1993 | list |
| 48482 Oruki | 5 February 1992 | list |
| 48495 Ryugado | 16 January 1993 | list |
| 52285 Kakurinji | 30 July 1990 | list |
| 52455 Masamika | 6 January 1995 | list |
| 58164 Reiwanohoshi | 20 November 1989 | list |
| 58184 Masayukiyamamoto | 7 September 1991 | list |
| 58185 Rokkosan | 7 September 1991 | list |
| 65716 Ohkinohama | 25 January 1993 | list |
| 65894 Echizenmisaki | 30 January 1998 | list |
| 79130 Bandanomori | 26 October 1990 | list |
| 79149 Kajigamori | 27 October 1992 | list |
| 79152 Abukumagawa | 17 March 1993 | list |
| 90713 Chajnantor | 11 November 1990 | list |
| 120462 Amanohashidate | 26 October 1990 | list |
| 237276 Nakama | 2 December 2008 | list |
| (321821) 2010 RT$_{46}$ | 3 September 2010 | list |