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The 20th century

1,560 inventions and discoveries

Invention or discovery	Date	Inventor or discoverer	Type
4903 Ichikawa	October 20, 1989	Toshimasa Furuta	asteroid
5640 Yoshino	October 21, 1989	Masaru Mukai	asteroid
4840 Otaynang	October 23, 1989	Yoshiaki Oshima	asteroid
4972 Pachelbel	October 23, 1989	Freimut Börngen	asteroid
4870 Shcherbanʹ	October 25, 1989	Lyudmila Zhuravlyova	asteroid
4869 Piotrovsky	October 26, 1989	Lyudmila Chernykh	asteroid
5477 Holmes	October 27, 1989	Eleanor F. Helin	asteroid
5479 Grahamryder	October 30, 1989	Schelte J. Bus	asteroid
5286 Haruomukai	November 4, 1989	Masaru Mukai	asteroid
4747 Jujo	November 19, 1989	Hiroshi Kaneda	asteroid
4717 Kaneko	November 20, 1989	Toshimasa Furuta	asteroid
5287 Heishu	November 20, 1989	Toshimasa Furuta	asteroid
4871 Riverside	November 24, 1989	Masahiro Koishikawa	asteroid
5288 Nankichi	December 3, 1989	Toshimasa Furuta	asteroid
5777 Hanaki	December 3, 1989	Toshimasa Furuta	asteroid
5875 Kuga	December 5, 1989	Kin Endate	asteroid
5823 Oryo	December 20, 1989	Tsutomu Seki	asteroid
4504 Jenkinson	December 21, 1989	Robert H. McNaught	asteroid
5352 Fujita	December 27, 1989	Osamu Muramatsu	asteroid
17445 Avatcha	December 28, 1989	Eric Walter Elst	asteroid
19148 Alaska	December 28, 1989	Eric Walter Elst	asteroid
7755 Haute-Provence	December 28, 1989	Eric Walter Elst	asteroid
10305 Grignard	December 29, 1989	Eric Walter Elst	asteroid
19981 Bialystock	December 29, 1989	Eric Walter Elst	asteroid
Euler's disk	1990	—	—
9033 Kawane	January 4, 1990	Toshimasa Furuta	asteroid
5825 Rakuyou	January 21, 1990	Atsushi Sugie	asteroid
5354 Hisayo	January 30, 1990	Hiroshi Kaneda	asteroid
5481 Kiuchi	February 15, 1990	Kin Endate	asteroid
5641 McCleese	February 27, 1990	Eleanor F. Helin	asteroid
14382 Woszczyk	March 2, 1990	Henri Debehogne	asteroid
6483 Nikolajvasilʹev	March 2, 1990	Eric Walter Elst	asteroid
8652 Acacia	March 2, 1990	Eric Walter Elst	asteroid
4873 Fukaya	March 4, 1990	Atsushi Sugie	asteroid
4508 Takatsuki	March 27, 1990	Kin Endate	asteroid
17447 Heindl	April 25, 1990	Eleanor F. Helin	asteroid
4547 Massachusetts	May 16, 1990	Kin Endate	asteroid
6041 Juterkilian	May 21, 1990	Eleanor F. Helin	asteroid
4974 Elford	June 14, 1990	Robert H. McNaught	asteroid
5585 Parks	June 28, 1990	Eleanor F. Helin	asteroid
6010 Lyzenga	July 19, 1990	Eleanor F. Helin	asteroid
4643 Cisneros	August 23, 1990	Henry E. Holt	asteroid
(7577) 1990 QV4	August 24, 1990	Henry E. Holt	asteroid
5185 Alerossi	September 15, 1990	Henry E. Holt	asteroid
4676 Uedaseiji	September 16, 1990	Tetsuya Fujii	asteroid
5235 Jean-Loup	September 16, 1990	Henry E. Holt	asteroid
4955 Gold	September 17, 1990	Henry E. Holt	asteroid
5134 Ebilson	September 17, 1990	Henry E. Holt	asteroid
4675 Ohboke	September 19, 1990	Tsutomu Seki	asteroid
16494 Oka	September 22, 1990	Eric Walter Elst	asteroid
4679 Sybil	October 9, 1990	Robert H. McNaught	asteroid
5068 Cragg	October 9, 1990	Robert H. McNaught	asteroid
5682 Beresford	October 9, 1990	Robert H. McNaught	asteroid
5236 Yoko	October 10, 1990	Toshimasa Furuta	asteroid
69288 Berlioz	October 11, 1990	Freimut Börngen	asteroid
7700 Rote Kapelle	October 13, 1990	Freimut Börngen	asteroid
(7579) 1990 TN1	October 14, 1990	Eleanor F. Helin	asteroid
32811 Apisaon	October 14, 1990	Freimut Börngen	asteroid
5187 Domon	October 15, 1990	Kin Endate	asteroid
12708 Van Straten	October 16, 1990	Eric Walter Elst	asteroid